FCM OAuth2 Token generator

Purpose

This little script helps you generating an OAuth2 token that you can as auth-header for cURL requests or in REST clients such as Postman.

HowTo

Prerequisites

• Make sure you have node.js installed
• Have a FCM service_accounts.json File for Authentication (See FCM Docs

Install

git clone <this repo>
cd fcm-oauth-generator
npm i
cp <path-to-your-serviceaccounts-file> .

Usage

npm start

or alternatively

node index.js

This results in an OAuth2 token output that can be used in postman.

If you don't want to install node.js on your host, try using Docker with a node.js image

SetUp Postman

• Create a POST Request
• Set the URL to https://fcm.googleapis.com/v1/projects/{{YOUR-FCM-PROJECT-ID}}/messages:send
• Set Authorization-Type to Bearer Token and set the scripts output as value.
• Define a valid Request Body (See FCM Docs)