APIs Development Tools

Welcome to the world of APIs tools development collection. An ongoing collection of awesome resources, tools, learning tutorials, libraries, webcasts for design and implement RESTful API's. This is starting point for you to know the options available to write your class-A grade of API. These are delightful list of resources and good tools that are available out there in the ecosystem.

`What Are APIs?`

API is the acronym for Application Programming Interface, which is a software intermediary that allows two applications to talk to each other. Each time you use an app like Facebook, send an instant message, or check the weather on your phone, you’re using an API.

`Table of Contents`

API Specification Languages
API Specification Tools
API Specifications
API Frameworks
API Client Development Tools
API Documentation
API Clients
API Debugging and Mocking
API Design Guides
API Publishing
API Gateways
API Security
API Monitoring
API Testing
JSON Format Standards
API Best Practices
Blogs
Public APIs

Contribute
License

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`API Specification Languages`

API Blueprint
JSON Schema
RAML
OpenAPI (formerly known as Swagger)

`API Specification Tools`

Swagger Inspector: Test and auto-generate OpenAPI documentation for any API.
Swagger Editor: An editor for designing Swagger specifications.
Swagger Tools and Integrations: A list of libraries and frameworks serving the Swagger ecosystem.
OpenAPI Spec Tooling: A list of libraries and frameworks serving the OpenAPI ecosystem.
API Studio. Write, mock, and share your Swagger specifications online.
Dredd: Validate API documentation written in API Blueprint against its backend implementation.
APITransformer: Transform API Descriptions from/to various formats e.g., Swagger, API Blueprint, RAML, WADL, Google Discovery, I/O Docs.
Restlet Studio: Web IDE for API Design.
API Spec Converter: Convert between different API spec formats.
Prism: Supercharge any OAS file with mocking, transformations, validations, and more.
Apimatic: Supports API description formats including Swagger, OAI format, RAML, API Blueprint, IO Docs, WADL, Postman Collections and HAR 1.4 and more
Mulesoft Anypoint: Design and publish enterprise-grade APIs using RAML
Sandbox: Quick and easy mock RESTful API from API definitions
Restunited: Generate SDK, Documentation with Testing and Debugging

`API Specifications`

API Commons: A repository of language-agnostic API specifications / Data Models.
APIS.guru: Directory of API specs in OpenAPI(aka Swagger) 2.0 format.
AnyAPI: Documentation and Test Consoles for Public APIs.

`API Frameworks`

Ruby

rails-api: Rails for API only applications.
pliny: Opinionated template Sinatra app for writing APIs in Ruby.
grape: An opinionated micro-framework for creating REST-like APIs in Ruby.
ActiveModel::Serializer: Brings convention over configuration to your JSON generation.
rabl: Generate JSON and XML from any ruby object.
jbuilder: Create JSON structures via a Builder-style DSL.
roar: Parse and render REST API documents using representers.

Python

Django REST framework: Toolkit that makes it easy to build Web APIs.
Tastypie: Webservice API framework for Django.
restless: A lightweight REST miniframework for Python.
flask-restful: Simple framework for creating REST APIs.
Falcon: Falcon is a low-level, high-performance Python framework for building HTTP APIs, app backends, and higher-level frameworks.
Connexion: Swagger/OpenAPI First framework for Python on top of Flask with automatic endpoint validation and OAuth2 support
apistar: A smart Web API framework, designed for Python3.
sanic: Sanic is a Flask-like Python 3.5+ web server that's written to go fast.
hug: hug aims to make developing Python driven APIs as simple as possible, but no simpler.

Javascript

hapi.js: Web and services application framework for Node.js.
Restify: Node.js REST framework specifically meant for web service APIs.
Express: Fast, unopinionated, minimalist web framework for Node.js.
sailsjs: Realtime MVC Framework for Node.js.
Actionhero: Multi-transport Node.js API server with integrated cluster capabilities and delayed tasks.
Baucis: To build
Koa: Next generation web framework for Node.js
Loopback: Node.js framework for creating APIs and easily connecting to backend data sources.
Seneca: A microservices toolkit for Node.js.
Feathers: Build RESTful and real-time APIs through Socket.io or Primus.
Deployd: Deployd is the simplest way to build realtime APIs for web and mobile apps
Nest: A modern node.js framework for efficient and scalable web applications built on top of TypeScript

Go

Go-Json-Rest: Thin layer on top of net/http that helps building RESTful APIs easily
gocrud: Go library to simplify creating, updating and deleting arbitrary depth structured data — to make building REST services fast and easy.
sleepy: RESTful micro-framework written in Go.
restit: Go micro framework to help writing RESTful API integration test.
go-relax: Framework of pluggable components to build RESTful API's.
go-rest: Small and evil REST framework for Go.
go-restful: A declarative highly readable framework for building restful API's.
Goat: Minimalistic REST API server in Go.
Resoursea: REST framework for quickly writing resource based services.
Zerver: Zerver is a expressive, modular, feature completed RESTful framework.

Scala

Colossus: I/O and microservice library for Scala.
Finatra: Fast, testable, Scala HTTP services built on Twitter-Server and Finagle.
Play: The high velocity web framework for Java and Scala.
Scalatra: Simple, accessible and free web micro-framework.
Skinny Micro: Micro-web framework to build servlet applications in Scala.
Spray: Open-source toolkit for building REST/HTTP-based integration layers on top of Scala and Akka.
Akka HTTP: The Akka HTTP modules implement a full server- and client-side HTTP stack on top of akka-actor and akka-stream.
Swagger Akka HTTP: Swagger-Akka-Http brings Swagger support for Akka-Http Apis.

Java

Rest.li: REST framework using type-safe bindings and asynchronous, non-blocking IO.
Dropwizard: Framework for developing ops-friendly, high-performance, RESTful web services.
Jersey: RESTful web services in Java.
Spring Boot: RESTful Web Service using Spring, high-performance and little configuration needed.

Haskell

Scotty: Micro web framework inspired by Ruby's Sinatra, using WAI and Warp.
Spock: Another Haskell web framework for rapid development.
Servant: A Type-Level Web DSL.
Yesod: The Haskell RESTful web framework.

Elixir

Phoenix: Framework for building HTML5 apps, API backends and distributed systems.
Plug: A specification and conveniences for composable modules between web applications.

Erlang

Cowboy: Small, fast, modular HTTP server written in Erlang.
Gen Microservice: This library solves the problem of implementing microservices with Erlang.
Mochiweb: Erlang library for building lightweight HTTP servers.

Postgres

PostgREST: Serve a RESTful API from any existing PostgreSQL database.

PHP

API Platform: API framework on top of Symfony with JSON-LD, Schema.org and Hydra support
Dingo API: A RESTful API package for the Laravel and Lumen frameworks
Fractal: Fractal provides a presentation and transformation layer for complex data output, the like found in RESTful APIs, and works really well with JSON
Yii2 Framework: Provides a whole set of tools to simplify the task of implementing RESTful Web Service APIs

Miscellaneous

Dream Factory: Turn any database into an API platform.

API Client Development Tools

General

Swagger CodeGen: Generate client libraries automatically from a Swagger-compliant server.
sdks.io: Explore Automatically Generated SDKs.
AutoRest: Generate client libraries for RESTful web services
Unirest: Lightweight HTTP-Request client libraries for several languages

Ruby

heroics: Ruby HTTP client for APIs represented with JSON schema.
blanket: A Ruby API wrapper.
nestful: Ruby HTTP/REST client.

Java

Retrofit: A type-safe HTTP client for Android and Java.

Javascript

Restangular: Restangular is an AngularJS service that simplifies common GET, POST, DELETE, and UPDATE requests with a minimum of client code

.NET

Refit: The automatic type-safe REST library for .NET Core, Xamarin and .NET
WebAnchor: Web Anchor provides type-safe, testable and flexible access to web resources.

API Documentation

ReDoc: OpenAPI/Swagger-generated API Reference Documentation.
Swagger UI: Dynamically generate documentation from a Swagger-compliant API.
Slate: Static site generated documentation for your API.
prmd: JSON Schema tooling: scaffold, verify, and generate documentation from JSON Schema documents.
Aglio: An API Blueprint renderer with theme support that outputs static HTML.
Apiary: Collaborative design, instant API mock, generated documentation, integrated code samples, debugging and automated testing.
Readme: API Documentation Hosting.
Embed curl: Embeddable curl commands on the web.
Gelato: Create developer portals for your API.
API Docs: Hosted public API documentation for OAS (Swagger) and RAML specs.
Docula: Documentation using Github and OpenAPI standards.
Docbox: REST API documentation generator, using Markdown.
widdershins: REST API documentation generator from OpenAPI 3.0 / Swagger 2.0 / AsyncAPI 1.x / Semoasa 0.1.0 definition

API Clients

Hosted

Hurl.it: Web-based HTTP client.
JSON Generator: Generate and host mock JSON data.
Extends Class: Online REST client.

Desktop

HTTPie: Command line HTTP client.
HttpMaster: Desktop tool for REST API testing.
Paw: REST client for Mac.
Postman: Desktop API testing tool.
Insomnia: REST API client for Mac, Windows, and Linux.
Jsonium: Free REST client for JSON over HTTP protocols
I'm only Resting: Windows GUI tool for REST API testing

API Debugging and Mocking

Hosted

Beeceptor: An HTTP-proxy for rest APIs - inspect and build mock APIs.
MockBin: Generate mock HTTP endpoints.
RequestBin: Inspect and debug webhook POST requests.
httpbin: Templated responses for testing various scenarios for HTTP requests.

Desktop

Json-Server Full fake REST API with zero coding.
Mockoon: Desktop API mocking tool.
Postman: Desktop API client and mocking tool.

API Design Guides

Google API Design Guide
PayPal API Style Guide
Heroku Platform HTTP API Design Guide
Haufe API Style Guide
Microsoft REST API Guidelines
18F API Standards
The RESTed NARWHL
White House Web API Standards
Zalando REST API Guidelines
API Stylebook Design Guidelines
API Stylebook Design Topics
Adidas-group API Design Guide

API Publishing

Mashape: API Marketplace.

API Gateways

AWS API Gateway: Traffic management, authorization and access control, monitoring, and API version management.
API Umbrella: Proxy that sits in front of your APIs.
APIAxle: Proxy that sits in front of your APIs.
APIGrove: API manager built in Java on top of Fuse ESB.
Apigee127: nodejs based API Gateway
Pushpin: Proxy for both request/response or streaming (long poll) of responses
Strongloop: nodejs based API Gateway
Fusio: PHP based open source API management platform
Camel: Empowers you to define routing and mediation rules in a variety of domain-specific languages, including a Java-based fluent API, Spring or Blueprint XML configuration files, and a Scala DSL.
HAProxy: Reliable, high Performance TCP/HTTP load balancer.
OpenResty: Fast web application server built on top of Nginx.
Tengine: A distribution of Nginx with some advanced features.
Tyk: Open-source, fast and scalable API gateway, portal and API management platform.
Vulcand: Programmatic load balancer backed by Etcd.
Zuul: An edge service that provides dynamic routing, monitoring, resiliency, security, and more.
Kong: An open-source management layer for APIs, delivering high performance and reliability.
Janus: A lightweight API Gateway written in Go by Hello Fresh.
fabio: A fast, modern, zero-conf load balancing HTTP(S) router for deploying microservices managed by consul by eBay.
Traefik: Træfik (pronounced like traffic) is a modern HTTP reverse proxy and load balancer written in Go.
Oathkeeper: OIdentity & Access Proxy (IAP) that authorizes HTTP requests based on sets of rules. Integrates with ORY Hydra.

API Security

API Security checklist: Checklist of the most important security countermeasures when designing, testing, and releasing your API.
Ory Hydra: OAuth2 server with OpenID Connect written in Go.

API Monitoring

Runscope: API Performance Monitoring.
Moesif: Understand API Usage and Monitor API KPIs.
Ping-API: Automated API Testing.

API Testing

Assertible: Continuously test and monitor your APIs after deployments and across environments.
Pyresttest: YAML based REST testing and API microbenchmarking tool
OWASP Zaproxy: A tool to test your API for known security vulnerabilities, with a great CI integration.

JSON Format Standards

HAL
JSONAPI
JSON Schema
Hydra
Ion

API Best Practices

What is an API
Choosing an HTTP Status Code
REST in Practice
Roy Fielding's dissertation on REST
Best Practices for Designing a Pragmatic RESTful API
How to Design a REST API
Automated API Development
Nordic APIs
Undisturbed REST
Build APIs You Won't Hate
Irresistible APIs
How to build an API
API University
RESTful Web Services
RESTful Web APIs
The Ten Essentials for Good API Documentation

Blogs

API Evangelist
Moesif Blog
Nordic APIs
Programmable Web
APIHandyman

Public APIs

Advertising

API	Description	Open/Trial
Amazon Mobile Ads	Monetize across platforms with multiple ad formats.	N/A
Facebook Marketing API	Manage ads and campaigns using the Facebook API.	N/A
Google AdSense	Free, flexible way to earn money from your websites, mobile sites, and site search results.	N/A
Google AdWords API	Manage Google AdWords campaigns programmatically.	N/A
Microsoft Advertising Platform - Bing Ads API	Provides programmatic access to various advertising technologies.	N/A
Yahoo Gemini API	Allows advertisers to manage complex Gemini accounts and campaigns more efficiently.	N/A

API	Description	Open/Trial
Amazon Mobile Analytics	Service for collecting, visualizing, and understanding app usage data at scale.	N/A
Callcounter	Analytics for API providers. Send request metadata to the API and view user friendly charts to analyse usage.	💸
Clicky	Allows you to extract your web site's traffic data into several formats, making it easy to integrate, analyze, or store your data within your own application.	N/A
Fabric	A platform that helps your mobile team build better apps, understand your users, and grow your business.	N/A
Flurry	Yahoo’s Flurry provides you with a number of APIs enabling you to export your data.	N/A
Google Analytics	Google Analytics provides APIs to collect, configure, and report on user-interactions with your online content.	N/A
Localytics	Interface to Localytics analytics platform.	N/A
Matomo	Matomo is an all-in-one premium web analytics platform designed to give you the most conclusive insights.	💸
MixPanel	Analytics for mobile and web which helps you analyze the actions people take in your application.	N/A
Open Web Analytics	Provides a way to request and work with your data outside of the OWA reporting interface.	N/A
Ticksel	Friendly website analytics made for humans. Secure and powerful yet simple to use.	N/A
Woopra	Real-time website analysis tool that targets customer engagement.	N/A
Zoho Reports API	Build powerful reporting and analytical capabilities into your application.	N/A

API	Description	Open/Trial
Vuforia	Solid SDK with robust development options.	💸
Wikitude	Wikitude’s all-in-one AR solution includes image recognition & tracking, 3D model rendering, video overlay, location based AR.	💸

API	Description	Open/Trial
Google Barcode	The Barcode API detects barcodes in real-time, on device, in any orientation. It can also detect multiple barcodes at once.	N/A
EAN-Search	The EAN-Search API allows you to lookup products by EAN, UPC or GTIN barcode.	💸
QR Code API	QR Code REST API. Can create QR code images or read existing images and return the contents.	`💸`
Stakdek's QR Generator API	Returns QR code image. Uses `python qrcode`.	N/A

API	Description	Open/Trial
Google Charts	Free tool with a wide range of capabilities for visualizing data from a website.	N/A
Keen IO	Keen IO is a powerful, flexible, and scalable solution that’s literally Big Data, easy-to-implement and at your fingertips.	N/A
Mongo DB	mongoDB is ideal for developers who want precise control over the final results and processes for handling Big Data.	N/A
Ryft	integrate the Ryft ONE’s data analysis capabilities into existing big data environments for faster data analysis and real-time intelligence.	N/A
LinkedData.Center	a RDF graph database as a service with W3C SPARQL query and SPARQL update apis.	💸

API	Description	Open/Trial
Bitcoin	Find useful resources, guides and reference material for developers.	N/A
Bitcoincharts	You can use this API to include markets data in your websites, mobile apps or desktop applets.	N/A
bitpay	A simple, RESTful API to the most powerful bitcoin infrastructure on the planet.	N/A
Block	The most versatile and secure wallet for all your coins.	N/A
BlockCypher	BlockCypher is the infrastructure fabric for blockchain applications.	N/A
BlockFacts.io	Compliance-first digital asset data with REST and WebSocket API support. Real-time cryptocurrency data from multiple exchanges via a single unified API. SDKs for integration, rich historic tick data.	N/A
Coinbase	Coinbase APIs and developer tools make building bitcoin and blockchain apps much easier.	N/A
CoinDesk	Bitcoin Price Index.	N/A
Coingecko	Free and Public Cryptocurrency API which you can use without an API key.	N/A
Coinlore	Cryptocurrency tick data API.	N/A
CoinMarketCap	Cryptocurrencies Prices.	N/A
coinpaprika	Cryptocurrencies prices, market capitalization, volume and more.	N/A
CryptoCompare	Cryptocurrencies Comparison.	N/A
Cryptonator	Cryptocurrencies Exchange Rates.	N/A
CryptoTradingAPI	Real-Time Crypto Prices & Technical Analysis JSON API. 31 Technical Indicators From Binance, CoinBase and Kraken.	N/A
Coinigy	Interact with Coinigy Accounts and Exchange Accounts Directly.	N/A
Covalent	Multi-blockchain data aggregator at one unified API.	N/A
Exchange Rates API	Market Prices and exchanges rates api.	N/A
ShapeShift.io	Exchange between cryptocurrencies without an account. Well documented API for easy use.	N/A
Technical Analysis	Cryptocurrency prices, technical analysis and sentiment detection.	N/A
Poloniex	US based digital asset exchange.	N/A

API	Description	Open/Trial
CalendarIndex	Worldwide Holidays and Working Days API.	N/A
Holiday API	Public holiday API service for several supported countries.	N/A

API	Description	Open/Trial
Anti-Captcha	Access to Anti-Captcha’s API.	N/A
ProxyCrawl	Crawl and scrape websites without the need of proxies, infrastructure or browsers. We solve captchas for you and prevent you being blocked while speeding up your development.	💸
Google reCAPTCHA	ReCAPTCHA lets you embed a CAPTCHA in your web pages in order to protect them against spam and other types of automated abuse.	N/A

API	Description	Open/Trial
Facebook Check-In	A check-in made to a location-based Page.	N/A
Google Places	Access to Google Places’ API.	N/A
Foursquare Check-In	Allows you to check in to a place.	N/A

API	Description	Open/Trial
Commerce Layer	Commerce Layer is a headless commerce platform that lets you add global ecommerce capabilities to any website, mobile app, chatbot, or IoT device, with ease. using the language, CMS, and tools you already master and love.	N/A
Dummy Products	Provides dummy products to aid you in prototyping or developing e-commerce type of websites.
envoice	Invoicing for online businesses. Simplify your invoicing process and get paid online with a debit or credit card via your payment gateway.	N/A
koomalooma	A Loyalty BPaaS (Business Process as a Service) for mobile and web companies. Merchants issue points for actions their customers/users make, for example a purchase or a referral. koomalooma takes care of all the rest, from signing up users, keeping track of points and delivering rewards in over 80 countries.	💸
Marketcloud	eCommerce APIs for developers. It covers inventory and database, carts and checkout, payments, user authentication, and more. You just bring the frontend.	N/A
MLScrape	Scrape product data from any e-commerce website, free tier with quota that resets monthly.	💸
Moltin	Unified APIs for inventory, carts, the checkout process, payments and more, so you can focus on creating seamless customer experiences at any scale.	N/A
Stripe	Allows both private individuals and businesses to accept payments over the Internet.	N/A
Braintree	Specializes in mobile and web payment systems for ecommerce companies.	N/A

API	Description	Open/Trial
Africa's Talking	Access African telco services through a HTTP API.	💸
iP1sms	Send and receive SMS messages worldwide.	💸
MailGun	Transactional Email API Service For Developers. Free first 10000 emails per month.	💸
Nexmo	Make and receive phone calls, send and receive SMS worldwide. Libraries in Node, Ruby, Java, PHP, .NET & Python.	💸
Phone Number Validation	Check phone number validity, location and timezones.	N/A
Sakari	Send and Receive SMS to over 200+ countries around the world. Send one or one million messages from a single API call.	💸
Telnyx	Build Voice, SMS, Fax, Networking and Cellular IoT applications on a private, purpose-built global communications network.	💸
The SMS Works	The SMS Works provides a low-cost, reliable SMS API for developers. Pay only for delivered texts, all failed messages are refunded.	💸
Twilio	APIs for SMS, Voice, Video and more.	💸

API	Description	Open/Trial
Jokes	Full featured Jokes API	💸
Perfect Tense API	The Perfect Tense API is the only spelling and grammar checking API that uses artificial intelligence to automatically correct all of your text in one call.	💸
qKast Channel Content	Access live content collections sourced from any page around the web.	N/A
Random Data Generator	API Generator for telephones, text, numbers, passwords, names, social security numbers, and cards.	💸
Random Facts	Random Facts API	💸
SLF	German city, country, river, database.
Today in History	Daily historical events, births and deaths API.
Wikipedia	Free multilingual Encyclopedia.	N/A

API	Description	Open/Trial
Dribbble	Dribbble is a community of designers answering that question each day.	N/A
Behance	Behance is the leading online platform to showcase & discover creative work.	N/A
Pexels	Pexels provides high quality and completely free stock photos licensed under the Creative Commons Zero (CC0) license.	N/A
PHP-Noise	Noise background image generator api with various parameters.

API	Description	Open/Trial
Agarathi	Tamil language Dictionary API.	💸
Cambridge Dictionaries Online	Access to Cambridge’s custom-developed API.	💸
Datamuse API	Word-finding query engine that finds words that match a given set of constraints and that are likely in a given context.	💸
Free Dictionary API	Get word definitions for free.	N/A
Lingua Robot API	Definition of words, pronunciations, synonyms and antonyms, lemmatization and morpheme segmentation.	💸
Merriam-Webster Dictionary API	Gives developers access to a big ass resource of dictionary and thesaurus content as well as specialized medical, Spanish, ESL, and student-friendly vocabulary.	N/A
Oxford Dictionary API	Access to Oxford Dictionary services with several different subscription options including a free tier.	💸
Wordnik	Dictionary functions.	N/A
Words API	Use it to find definitions for more than 150,000 words.	N/A
Wiktionary API	Collaborative, free-content multilingual dictionary.	N/A

API	Description	Open/Trial
Breaking Bad & Better Call Saul API	Get data about characters, episodes, quotes, and deaths.	N/A
Cat as a Service (CATAAS)	Is a REST API to spread peace and love (or not) thanks to cats.	N/A
Comic Vine	An extremely mature, well organized and continually updated resource of comic information.	N/A
Comichron Data	API for comic sales data from comichron.com.
Danbooru	Get images categorized by tags.	N/A
Final Space API	A RESTful API that provides information and images about Final Space show.
Fun Translations API	Translate to over 50+ languages from various TV Series and Movies.	N/A
Lord of the Rings API	Get data about the books, the movie trilogy, many characters and quotes.	N/A
Marvel	Access over 70 years of comic data with Marvel's official developer API.	N/A
My Anime List API	Get data about any specific anime or anime genre of your choice.
Pokéapi	All the Pokémon data you'll ever need, in one place.
Rick and Morty	All the Rick and Morty information, including images.
Star Wars API (SWAPI)	All things Star Wars, based on Wookpedia and other sources. Reboot of original swapi.co, guaranteed to be maintained.
Studio Ghibli	Resources from Studio Ghibli films.
TCGdex	A Multilanguage Pokémon TCG Database with Cards Pictures and most of the informations contained on the cards.

API	Description	Open/Trial
1Forge.com	Real-time forex and crypto quotes via JSON and WebSocket.	N/A
Coingecko.com	Free, comprehensive cryptocurrency API.	N/A
Currency-api	Free Currency Exchange Rates API with 150+ Currencies & No Rate Limits.
CurrencyLayer.com	Exchange rates and currency conversion API.	N/A
CurrencyScoop.com	Real-time and historical currency rates JSON API.	N/A
ExchangeRate-API.com	Currency conversion API.	N/A
ExchangeRatesAPI.io	Foreign exchange rates API with currency conversion.
Fixer.io	JSON API for foreign exchange rates and currency conversion. End of day data only.	N/A
Frankfurter.app	Exchange rates and currency data API.
OpenRates.io	Live exchange rates and currency conversion API.	N/A
ratesapi.io	Free foreign currency exchange rates and currency conversion.	N/A

API	Description	Open/Trial
Data Science Toolkit	A collection of the best open data sets and open-source tools for data science.	N/A
Time Door	Time Door is an API for statistical insights into time series data.	💸

API	Description	Open/Trial
Kairos	Face recognition, emotion analysis and measuring engagement of people in images or videos for any mobile or web application. 30 Day Trial	💸
Skybiometry	Face detection, emotional analysis, face grouping, recognition service and tagging the photo.	N/A

API	Description	Open/Trial
Amazon S3	API that provides access to stored files and can be added easily to any service - and it's free for twelve months.	💸
Cloudinary	API for image and video storage and manipulation - free for up to 75,000 images and 7,500 manipulations per month, good documentation, it can also manipulate GIFs and PDFs.	N/A
DigitalOcean Spaces	API that provides easy access to store and receive files as simple object storage with easy to understand pricing. 2 Month Free Trial	💸
Dropbox	API for accessing stored files and pictures which is easy to use and free for small amounts of data.	N/A
Filestack	API for image and file manipulation, 250 uploads and 500 uploads per month for free, free CDN, HTML widget.	N/A
Microsoft Graph	API for accessing stored files and photos for personal and enterprise users with high resolution thumbnails and Microsoft Office APIs.	N/A
PDF Blocks	API for working with PDF documents (merge, add password, watermark, and more). Well documented, easy to use. 14-day free trial.	💸
Vector Express	API for converting, processing and analyzing vector files.	N/A
Verizon Cloud	API for accessing stored pictures and other files stored by users of Verizon Cloud app.	N/A

API	Description	Open/Trial
Alpha Vantage	Y Combinator backed API provider for stock, ETF, mutual fund, forex, and crypto data. There is also a 2000+ star Python wrapper for it on GitHub.	N/A
Hotstoks	Stock market data powered by SQL.	N/A
IEX	Free Stocks and Market Data.	N/A
Twelve Data	Stock market data (real-time & historical).	N/A
Australia	Plenty of kinds of data in CSV format.	N/A
Canada	Daily exchange rates and statistical data tables in CSV, XML or JSON formats.	N/A
Exchange Rates	Foreign exchange rates API with currency conversion. JSON & CORS.
Ireland	Variety of data mainly in XLS format.	N/A
Myanmar	Currency exchange rates in JSON format.	N/A
Moldova	Currency exchange rates in XML, JSON and XLS formats.	N/A
New Zealand	Variety of data in XLS format.	N/A
Nigeria	Exchange rates and other info in CSV format	N/A
Peru	Variety of data in XLSX format.	N/A
Poland	Currency exchange rates and gold prices in the XML and JSON formats.	N/A
Russian Federation	History of exchange rates via REST XML and far more macroeconomical info via SOAP.	N/A
Switzerland	Rich variety of data in XLS and CSV formats.	N/A
Ukraine	Exchange rates and bond placements in JSON and XML formats.	N/A
Portfolio Optimizer	API for investment portfolio optimization.	N/A

API	Description	Open/Trial
FitBit	Web API for accessing data from Fitbit activity trackers, Aria scale, and manually entered logs.	N/A
HealthGraph	RunKeeper's web-based HealthGraph API presents Health Graph data, and provides information about a user and friends.	N/A
Open Food Facts	Open Food Facts is a database of food products with ingredients, allergens, nutrition facts and all the tidbits of information we can find on product labels.	N/A
Strava	API for accessing and managing data about athletes, activities and segments.	N/A
Withings	Access to data from Withings activity trackers and body measures.	N/A

API	Description	Open/Trial
Gmail API	The Gmail REST API. v1	N/A
Google BigQuery API	A data platform for customers to create, manage, share and query data. v2	N/A
Google Books API	Lets you search for books and manage your Google Books library. v1	N/A
Google Calendar API	Lets you manipulate events and other calendar data. v3	N/A
Google Classroom API	The Google Classroom API. v1	N/A
Google CustomSearch API	Lets you search over a website or collection of websites. v1	N/A
Google Drive API	The API to interact with Google Drive. v3	N/A
Google Fitness API	The Fit API. v1	N/A
The Google Fonts Developer API.	The Google Fonts API helps you add fonts to any web page. v1	N/A
Google Genomics API	Provides access to Genomics data. v1beta2	N/A
Google Identity Toolkit API.	Helps third party sites implement federated login. v1	N/A
Google Monitoring API	API for accessing Google Cloud and API monitoring data. v2beta2	N/A

API	Description	Open/Trial
BlockScore	A real-time API for verifying an identity by name, address, date of birth, and social security number.	Unknowm
Cognito	A powerful API for verifying and retrieving identity information. Can take a customer's cellphone number and return name, address history, full SSN, and date of birth.	N/A
Whitepages Pro	Global Identity Verification API. Get a clearer picture of your customer. Instantly know if a name, address, phone number, email, and IP all belong to the same person. Every country in the world supported.	💸

API	Description	Open/Trial
Clarifai	AI API that analyzes images and videos and returns probability scores on the likelihood that the image contains pornography.	N/A
WebPurify	Provides live image moderation by humans. Free for first 100 images. 2¢ per image after.	💸

API	Description	Open/Trial
Ably	API for making cross-protocol realtime communication between devices easy.	N/A
Particle	API to manage Particle devices (including their own Arduino-compatible ones and the Raspberry Pi) and control them. Free for up to 25 devices and 250k events/month.	N/A
PubNub	API to make realtime applications with variety of hardware devices including Arduino, RPi, Kinoma, Atmel, Samsung Smart TV WebOS, and more.
Philips Hue	Registration (free) and local Hue Bridge (not free) required - Control Hue brand lights made by Philips. API calls are made to the Hue Bridge residing on local network. Includes a web based UI.	N/A
SmartThings	API for Samsung SmartThings Smart Home Hub products (ZigBee, Z-Wave, IP).	N/A
Temboo SDK	This platform acts as a layer on top of third-party APIs, using code snippets to trigger complex processes that run through their cloud platform.	N/A
ThingSpeak	“Internet of Things” application and API to store and retrieve data from things using HTTP over the Internet or via a Local Area Network.	N/A
Xively	Uses free and open libraries to let you connect different types of hardware, using a variety of languages to their cloud service.	N/A
Zetta	An open source platform built on Node.js for creating IoT servers that run across geo-distributed computers and the cloud.

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APIs Development Tools

What Are APIs?

Table of Contents

API Specification Languages

API Specification Tools

API Specifications

API Frameworks

Ruby

Python

Javascript

Go

Scala

Java

Haskell

Elixir

Erlang

Postgres

PHP

Miscellaneous

API Client Development Tools

General

Ruby

Java

Javascript

.NET

API Documentation

API Clients

Hosted

Desktop

API Debugging and Mocking

Hosted

Desktop

API Design Guides

API Publishing

API Gateways

API Security

API Monitoring

API Testing

JSON Format Standards

API Best Practices

Blogs

Public APIs

Advertising

Analytics

Augmented Reality

BarCode

Big Data and Analytics

Cryptocurrency/Crypto Wallets

Calendar

Captcha

Check-In

Commerce

Communication

Content

Currency

Data Science

Design

Dictionary

Entertainment

Events

Face Recognition

File Storage and Manipulation

Finance

Fitness

Google

Identity Verification

Image Moderation

IoT

Legal

Open Licenses

Login Authentication

Machine Learning

Maps

Math

`What Are APIs?`

`Table of Contents`

`API Specification Languages`

`API Specification Tools`

`API Specifications`

`API Frameworks`

`References`

`License`

API	Description	Open/Trial
GitHub Licenses API	N/A	N/A
ToSDR Terms Of Service API	N/A	N/A

API	Description	Open/Trial
Auth0	Authenticate and authorize apps and APIs with any identity provider running on any stack any device or cloud. Free for 700 active users.	N/A
Facebook Login for Apps	Secure, fast, convenient way to login in your app/website.	N/A
Firebase	Authentication, analytics, cloud messaging, crash reporting, ads and more.	N/A
GitHub Authentication	Access to GitHub’s Authentication API.	N/A
Instagram	Access to Instagram’s OAuth API.	N/A
LinkedIn	Make it convenient for your users to sign in with their professional identity.	N/A
PayPal	Enables your customers to sign in to your web site quickly and securely using their PayPal login credentials.	N/A
Salesforce	Salesforce uses the OAuth protocol to allow users of applications to securely access data without having to reveal username and password credentials.	N/A
Twitter Sign-in	Works on websites, iOS, mobile and desktop applications.	N/A
WorkOS	Support Single Sign-On for common Enterprise Identity Providers (Okta, Azure, OneLogin).	N/A

API	Description	Open/Trial
Amazon ML API	Amazon Machine Learning API simplifies the process of making predictions that require lots of expertise around model building, data cleansing and statistical analysis.	N/A
AYLIEN	AYLIEN Text Analysis API is a package of Natural Language Processing, Information Retrieval and Machine Learning tools for extracting meaning and insight from textual and visual content with ease.	N/A
Big ML	BigML is user-friendly and developer-friendly Machine learning API that mainly concentrates on decision trees.	N/A
Cloud Machine Learning Engine	Cloud-based machine learning and pattern matching tool.	N/A
Microsoft Azure Machine Learning API	Helps data scientists publish in minutes which once used to take days after they had developed a feasible model.	N/A
ObjectCut	Automatic background removal service powered by AI. From an input image given its public-accessible URL or being the image itself, ObjectCut returns the same image but without background.	N/A
Unplugg	Automated Forecasting API for timeseries data which can be used to forecast energy consumption, temperature, or any other timeseries data which has some seasonality effect.	N/A

API	Description	Open/Trial
Amazon Maps API v2	Add interactive 3D maps, graphics, and custom overlays to your Fire Tablet and Fire phone apps.	N/A
Bing Maps	Bing Maps platform provides multiple API options for your application.	N/A
Cartes.io	Create maps and markers for anything, without authentication.
CartoDB	Allows you to generate maps based on data hosted in your CartoDB account.	N/A
Daum Maps API	Daum Maps provide multiple APIs for Korean map.	N/A
Google Maps API	Google Maps APIs are available for Android, iOS, web browsers and through HTTP web services. Clients can be found here.	N/A
HERE Maps API	Wide range of APIs available through JavaScript, iOS, Android, or REST services.	N/A
Leaflet.js	An open-source JavaScript library for mobile-friendly interactive maps.
Mapbox	Access to MapBox’s API.	N/A
Open Street Map	API access to OSM.	N/A
Scribble	The Scribble Maps API is a cross browser, mobile ready, HTML5/JavaScript, interactive map builder.	N/A
Yahoo Maps	Yahoo Maps lets you easily embed rich and interactive maps using your choice of platform.	N/A
Yandex	API for installing Yandex.Maps and the necessary tools for working it on your web app or site.	N/A

API	Description	Open/Trial
Matlab	The MATLAB RESTful API enables you to evaluate MATLAB functions on remote servers using JSON representation of MATLAB data types.	N/A
Newton	An API for Arithmetic and Symbolic Math.

API	Description	Open/Trial
COVID-19 Data	Get live and historical data regarding Coronavirus cases per country.
Infermedica	AI-based engine for patient triage and preliminary medical diagnosis. v2	N/A
Lexigram	NLP that extracts mentions of clinical concepts from text, gives access to clinical ontology. v1	N/A

API	Description	Open/Trial
Aadhaar Bridge	Aadhaar is a 12-digit unique identification number issued by the Indian government to every individual resident of India. API allows you to authenticate and perform ekYC and eSign using Aadhar.	💸
Mozilla Addons	Mozilla's catalogue of addons for Firefox-compatible web browsers.
Bhagavad Gita	Bhagavad Gita in various languages.
Breaking Bad Quotes	A simple API to retrieve some quotes of Breaking Bad, bitch!
Callook.info	Look up information about United States ham radio callsigns.	N/A
ChuckNorris.io	A free JSON API for hand curated Chuck Norris facts.
Cloudflare Trace	Get IP Address, Timestamp, User Agent, Country Code, IATA, HTTP Version, TLS/SSL Version & More.	N/A
Dataflow Kit	Web Scraper API to extract information from web sites, scrape SERPs, convert web pages to PDF, and capture screenshots.	💸
Don't Kill My App	Database of ways mobile vendors inhibit background activity of apps.
Domainsdb.info	Registered domain names search checks the lists of registered domains for names containing particular words/phrases/numbers or symbols.	N/A
Evil Insult Generator	Offers the most evil insults.
Flowdash	Create, edit, delete, and read your workflow data on demand.	N/A
Game of Thrones Quotes	A free API to retrieve some quotes of Game of Thrones!
Geocodify	Worldwide geocoding, geoparsing and autocomplete for addresses.	💸
Giphy	Worlds largest library of GIFs.	N/A
Httpbin	A Simple HTTP Request & Response Service.
Httpbin Cloudflare	A Simple HTTP Request & Response Service with HTTP/3 Support by Cloudflare.
Icanhazepoch	Get Epoch time.
Icanhazip	IP Address API.
Image-Charts	1 URL = 1 Chart: Get a chart image in response to a URL GET or POST request. A drop-in-replacement for the deprecated Google Image Charts.	N/A
IP Sidekick	IP Sidekick is an API that returns information about an IP address. You can use it to customize your content based on the visitor's location or display their country.	N/A
JSONbin.io	Free JSON data storage service, ideal for small scale web apps, website, mobile apps.	N/A
Judge0 API	Compile and run source code.
Labs64 NetLicensing (API Test Center)	Innovative License Management Solution.	N/A
LaunchLibrary	Aggregated info about space launches.	N/A
LetsValidate	Uncovers the technologies used on websites and URL to thumbnail.	N/A
LinkPreview	RESTful API that returns JSON formatted summary with title, description and preview image for any requested URL. Free & paid plans.	N/A
LiveChat	Online Customer Service software with customizable chat, embeddable widgets, help desk and web analytics tools. APIs include webhooks support, SDKs and open-source libraries to build on.	💸
Lottery Number Generation	Generate lottery numbers. Hundereds of lottery games from various countries are supported.	💸
PageCDN	Public CDN API for Open-source JavaScript, CSS and fonts libraries.
PDFmyURL	RESTful API that converts webpages to PDF quickly and even does entire websites to PDF.	💸
PDF from URL	API that converts websites from URL to PDF and even does convert HTML Strings to PDF for free.	N/A
Pastebin	Quickly share text or code, with support for over 250 languages for syntax highlighting.	N/A
PhantAuth	Random User Generator + OpenID Connect Provider. Like Lorem Ipsum, but for user accounts and authentication.
QuickChart	Generate Chart.js image charts for email, dashboards, etc. Provides a replacement API for the old Google Image Charts service.
Quran API	A RESTful Quran API to retrieve an Ayah, Surah, Juz or the enitre Holy Quran.
Quran-api	Free Quran API Service with 90+ different languages and 400+ translations.
Rig Veda API	All of the poets and gods in the Rig Veda, presented with the mandal and sukta numbers they're mentioned in, the meters the verses are composed in, and the categories the poets and gods belong to.	N/A
Rocketium Video API	Rocketium Video API allows you to create Buzzfeed-like videos programmatically.	💸
Scraper API	Scraper API handles proxies, browsers, and CAPTCHAs so developers can easily build scalable web scrapers.	N/A
Spreaker	Enables developers to read and write data to Spreaker.	N/A
StackExchange	The StackExchange API provides RESTful services to all the sites on the StackExchange domain.	N/A
RandomUserGenerator	An API for generating random user data. Like Lorem Ipsum, but for people.
RestCountries	Get information about countries via a RESTful API.	N/A
Typeform	Typeform's APIs allow you to create and edit Typeform surveys, and retrieve survey responses on demand.	N/A
Unixtime	Free RESTservice to convert unixtime to datetime and vice versa.	N/A
Vedic Society API	A description of all of the nouns in vedic literature, including the flora, fauna, geography, food, relationships, and objects (personal nouns not included, though).	N/A
Wallhaven	A huge wallpaper library.	N/A
Website Text Extraction	Scrape websites and get their content as plaintext.	N/A
Who Hosts This	Detect the hosting provider powering any web site.	N/A
WolframAlpha	Integrate top of the line computational knowledge into your applications through the WolframAlpha API.	💸
WorldTimeAPI	A JSON/plain-text which returns the (approx) current time for a provided timezone or IP. Targetted at limited-compute IoT devices.	N/A

API	Description	Open/Trial
OMDB	OMDb provides a subscription based web service to obtain information and metadata about movies.	💸
TMDb	TMDb provides powerful searches as well as powerful movie discovery.	N/A
Trakt	Trakt collect lots of information about what tv shows and movies everyone is watching.	N/A
TVmaze	TV Show and web series database. Episode guide, cast, crew and character information. Recaps, reviews, episode trailers, celebrity photos and more.	N/A

API	Description	Open/Trial
AI Mastering	AI Mastering API provides automated audio mastering service. You can upload your audio, master it, and download the mastered audio.	N/A
Deezer	Deezer API provides a nice set of services to build up web applications allowing the discovery of Deezer's music catalogue.	N/A
Discogs	Access database of artists, labels, releases, marketplace and more.	N/A
Last.fm	The Last.fm API allows anyone to build their own programs using Last.fm data, whether they're on the web, the desktop or mobile devices.	N/A
musicApi	Centralized Node.JS API SDK for the top 3 music providers in China, Xiami, Netease, and QQ music.	N/A
NPR API	NPR's API is a content API, which essentially provides a structured way for other computer applications to get NPR stories in a predictable, flexible and powerful way.	N/A
QuantOneMusic	Answers the need for digital music data.	N/A
Rhapsody	Access metadata, user’s entire library of music and do much more.	N/A
SearchLy	Song similarity search API based on lyrics.
SoundCloud	Using the SoundCloud API, you can build applications that take sound on the web to the next level.	N/A
Spotify	Spotify’s Web API lets your applications fetch data from the Spotify music catalog, manage users' playlists and saved music, get recommendations, control Spotify Connect, and more.	N/A
TheAudioDB	Free JSON API for music data, artwork, charting, ratings and hashes.

API	Description	Open/Trial
Rovi	Access to Metadata, search capabilities and recommendations.	N/A
Setlist.fm	The setlist.fm API has been designed to give you easy access to setlist data in order to build fancy websites and other applications.	N/A
TuneFind	Allows developers to enhance their services with song, show, and movie data from TuneFind.	N/A
Genius	Allows users to find details about Genius artists and songs.	N/A