diff --git a/.github/workflows/e2e-test.yml b/.github/workflows/e2e-test.yml
index 83cabbbf..0fe65fce 100644
--- a/.github/workflows/e2e-test.yml
+++ b/.github/workflows/e2e-test.yml
@@ -94,12 +94,24 @@ jobs:
           cd RhinoApp
           Rscript ../test-lint-js.R
 
+      - name: format_js() should format JS scripts
+        if: always()
+        run: |
+          cd RhinoApp
+          Rscript ../test-format-js.R
+
       - name: lint_sass() should detect lint errors in CSS
         if: always()
         run: |
           cd RhinoApp
           Rscript ../test-lint-sass.R
 
+      - name: format_sass() should format SASS (.scss) scripts
+        if: always()
+        run: |
+          cd RhinoApp
+          Rscript ../test-format-sass.R
+
       - name: build_js() should build app.min.js
         if: always()
         run: |
diff --git a/DESCRIPTION b/DESCRIPTION
index 3d1888b5..8511f517 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -19,7 +19,7 @@ BugReports: https://github.com/Appsilon/rhino/issues
 License: LGPL-3
 Encoding: UTF-8
 Roxygen: list(markdown = TRUE)
-RoxygenNote: 7.2.3
+RoxygenNote: 7.3.1
 Depends:
   R (>= 2.10)
 Imports:
diff --git a/NAMESPACE b/NAMESPACE
index 9a787719..35179f92 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -4,7 +4,9 @@ export(app)
 export(build_js)
 export(build_sass)
 export(diagnostics)
+export(format_js)
 export(format_r)
+export(format_sass)
 export(init)
 export(lint_js)
 export(lint_r)
diff --git a/NEWS.md b/NEWS.md
index fcfbc9db..7b226386 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,4 +1,11 @@
-# rhino 1.8.0
+# rhino (development version)
+
+1. Introduce `format_js()` and `format_sass()` powered by [prettier](https://prettier.io).
+    * **Note:** `lint_js()` and `lint_sass()` report styling errors.
+      They _might_ complain about formatting done with `format_js()` and `format_sass()` functions; however, we haven't spotted any issues so far.
+      If you face any problems with this, then please [raise an issue on GitHub](https://github.com/Appsilon/rhino/issues/new/choose)
+
+# [rhino 1.8.0](https://github.com/Appsilon/rhino/releases/tag/v1.8.0)
 
 1. All linter functions migrated to `box.linters`. New rhino projects will be configured to use linters from `box.linters`.
 2. Updated GitHub Workflow template triggers.
diff --git a/R/tools.R b/R/tools.R
index 624cd52a..cf2e2718 100644
--- a/R/tools.R
+++ b/R/tools.R
@@ -233,6 +233,29 @@ lint_js <- function(fix = FALSE) {
   }
 }
 
+#' Format JavaScript
+#'
+#' Runs [prettier](https://prettier.io/) on JavaScript files in `app/js` directory.
+#' Requires Node.js installed.
+#'
+#' You can prevent prettier from formatting a given chunk of your code by adding a special comment:
+#' ```js
+#' // prettier-ignore
+#' ```
+#' Read more about [ignoring code](https://prettier.io/docs/en/ignore).
+#'
+#' @param fix If `TRUE`, fixes formatting. If FALSE, reports formatting errors without fixing them.
+#' @return None. This function is called for side effects.
+#'
+#' @export
+format_js <- function(fix = TRUE) {
+  if (fix) {
+    npm("run", "format-js", "--", "--write")
+  } else {
+    npm("run", "format-js", "--", "--check")
+  }
+}
+
 #' Build Sass
 #'
 #' Builds the `app/styles/main.scss` file into `app/static/css/app.min.css`.
@@ -319,6 +342,29 @@ lint_sass <- function(fix = FALSE) {
   }
 }
 
+#' Format Sass
+#'
+#' Runs [prettier](https://prettier.io/) on Sass (.scss) files in `app/styles` directory.
+#' Requires Node.js installed.
+#'
+#' You can prevent prettier from formatting a given chunk of your code by adding a special comment:
+#' ```scss
+#' // prettier-ignore
+#' ```
+#' Read more about [ignoring code](https://prettier.io/docs/en/ignore).
+#'
+#' @param fix If `TRUE`, fixes formatting. If FALSE, reports formatting errors without fixing them.
+#' @return None. This function is called for side effects.
+#'
+#' @export
+format_sass <- function(fix = TRUE) {
+  if (fix) {
+    npm("run", "format-sass", "--", "--write")
+  } else {
+    npm("run", "format-sass", "--", "--check")
+  }
+}
+
 #' Run Cypress end-to-end tests
 #'
 #' Uses [Cypress](https://www.cypress.io/) to run end-to-end tests
diff --git a/inst/WORDLIST b/inst/WORDLIST
index 05a8facc..8018df59 100644
--- a/inst/WORDLIST
+++ b/inst/WORDLIST
@@ -1,7 +1,6 @@
 Addin
 Addins
 Appsilon
-Boxifying
 ESLint
 Init
 JS
@@ -53,6 +52,7 @@ renv
 roxygen
 rstudio
 scalable
+scss
 shinyapps
 shinymanager
 shinytest
diff --git a/inst/templates/node/package-lock.json b/inst/templates/node/package-lock.json
index 7224027d..76b9d655 100644
--- a/inst/templates/node/package-lock.json
+++ b/inst/templates/node/package-lock.json
@@ -16,6 +16,7 @@
         "eslint-config-airbnb": "^19.0.4",
         "eslint-import-resolver-webpack": "^0.13.8",
         "eslint-plugin-import": "^2.29.1",
+        "prettier": "^3.3.2",
         "sass": "^1.69.7",
         "start-server-and-test": "^2.0.3",
         "stylelint": "^14.16.1",
@@ -7221,6 +7222,21 @@
         "node": ">= 0.8.0"
       }
     },
+    "node_modules/prettier": {
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.3.2.tgz",
+      "integrity": "sha512-rAVeHYMcv8ATV5d508CFdn+8/pHPpXeIid1DdrPwXnaAdH7cqjVbpJaT5eq4yRAFU/lsbwYwSF/n5iNrdJHPQA==",
+      "dev": true,
+      "bin": {
+        "prettier": "bin/prettier.cjs"
+      },
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/prettier/prettier?sponsor=1"
+      }
+    },
     "node_modules/pretty-bytes": {
       "version": "5.6.0",
       "dev": true,
@@ -14186,6 +14202,12 @@
       "integrity": "sha512-vkcDPrRZo1QZLbn5RLGPpg/WmIQ65qoWWhcGKf/b5eplkkarX0m9z8ppCat4mlOqUsWpyNuYgO3VRyrYHSzX5g==",
       "dev": true
     },
+    "prettier": {
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.3.2.tgz",
+      "integrity": "sha512-rAVeHYMcv8ATV5d508CFdn+8/pHPpXeIid1DdrPwXnaAdH7cqjVbpJaT5eq4yRAFU/lsbwYwSF/n5iNrdJHPQA==",
+      "dev": true
+    },
     "pretty-bytes": {
       "version": "5.6.0",
       "dev": true
diff --git a/inst/templates/node/package.json b/inst/templates/node/package.json
index 309da471..8d62ba4d 100644
--- a/inst/templates/node/package.json
+++ b/inst/templates/node/package.json
@@ -5,6 +5,8 @@
     "build-sass": "sass --no-source-map --style=compressed ../app/styles/main.scss:../app/static/css/app.min.css",
     "lint-js": "eslint --config .eslintrc.json ../app/js",
     "lint-sass": "stylelint ../app/styles",
+    "format-js": "prettier --config prettier.config.mjs --ignore-path none ../app/js/**/*.js",
+    "format-sass": "prettier --config prettier.config.mjs --ignore-path none ../app/styles/**/*.scss",
     "run-app": "cd .. && Rscript -e \"shiny::runApp(port = 3333)\"",
     "run-cypress": "cypress run --project ../tests",
     "open-cypress": "cypress open --project ../tests",
@@ -22,6 +24,7 @@
     "eslint-config-airbnb": "^19.0.4",
     "eslint-import-resolver-webpack": "^0.13.8",
     "eslint-plugin-import": "^2.29.1",
+    "prettier": "^3.3.2",
     "sass": "^1.69.7",
     "start-server-and-test": "^2.0.3",
     "stylelint": "^14.16.1",
diff --git a/inst/templates/node/prettier.config.mjs b/inst/templates/node/prettier.config.mjs
new file mode 100644
index 00000000..3cbc88eb
--- /dev/null
+++ b/inst/templates/node/prettier.config.mjs
@@ -0,0 +1,11 @@
+/** @type {import("prettier").Config} */
+export default {
+  overrides: [
+    {
+      files: "../app/js/**/*.js",
+      options: {
+        singleQuote: true,
+      },
+    },
+  ],
+};
diff --git a/man/format_js.Rd b/man/format_js.Rd
new file mode 100644
index 00000000..fffe7819
--- /dev/null
+++ b/man/format_js.Rd
@@ -0,0 +1,26 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/tools.R
+\name{format_js}
+\alias{format_js}
+\title{Format JavaScript}
+\usage{
+format_js(fix = TRUE)
+}
+\arguments{
+\item{fix}{If \code{TRUE}, fixes formatting. If FALSE, reports formatting errors without fixing them.}
+}
+\value{
+None. This function is called for side effects.
+}
+\description{
+Runs \href{https://prettier.io/}{prettier} on JavaScript files in \code{app/js} directory.
+Requires Node.js installed.
+}
+\details{
+You can prevent prettier from formatting a given chunk of your code by adding a special comment:
+
+\if{html}{\out{<div class="sourceCode js">}}\preformatted{// prettier-ignore
+}\if{html}{\out{</div>}}
+
+Read more about \href{https://prettier.io/docs/en/ignore}{ignoring code}.
+}
diff --git a/man/format_sass.Rd b/man/format_sass.Rd
new file mode 100644
index 00000000..2935793d
--- /dev/null
+++ b/man/format_sass.Rd
@@ -0,0 +1,26 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/tools.R
+\name{format_sass}
+\alias{format_sass}
+\title{Format Sass}
+\usage{
+format_sass(fix = TRUE)
+}
+\arguments{
+\item{fix}{If \code{TRUE}, fixes formatting. If FALSE, reports formatting errors without fixing them.}
+}
+\value{
+None. This function is called for side effects.
+}
+\description{
+Runs \href{https://prettier.io/}{prettier} on Sass (.scss) files in \code{app/styles} directory.
+Requires Node.js installed.
+}
+\details{
+You can prevent prettier from formatting a given chunk of your code by adding a special comment:
+
+\if{html}{\out{<div class="sourceCode scss">}}\preformatted{// prettier-ignore
+}\if{html}{\out{</div>}}
+
+Read more about \href{https://prettier.io/docs/en/ignore}{ignoring code}.
+}
diff --git a/pkgdown/_pkgdown.yml b/pkgdown/_pkgdown.yml
index 53ae2775..c73d675f 100644
--- a/pkgdown/_pkgdown.yml
+++ b/pkgdown/_pkgdown.yml
@@ -143,6 +143,8 @@ reference:
   - build_sass
   - lint_js
   - lint_sass
+  - format_js
+  - format_sass
   - react_component
 
 - title: Other tools
diff --git a/tests/e2e/test-format-js.R b/tests/e2e/test-format-js.R
new file mode 100644
index 00000000..4c51d838
--- /dev/null
+++ b/tests/e2e/test-format-js.R
@@ -0,0 +1,13 @@
+rhino::format_js()
+
+# Create bad scripts and test if formatting returns the expected result
+test_file_path <- fs::path("app", "js", "bad-style.js")
+cat('const  someFunction = (a ,b) => a+ b + "asdf"', file = test_file_path)
+rhino::format_js()
+testthat::expect_identical(
+  readLines(test_file_path),
+  "const someFunction = (a, b) => a + b + 'asdf';"
+)
+
+# Clean up
+file.remove(test_file_path)
diff --git a/tests/e2e/test-format-sass.R b/tests/e2e/test-format-sass.R
new file mode 100644
index 00000000..e75b474b
--- /dev/null
+++ b/tests/e2e/test-format-sass.R
@@ -0,0 +1,18 @@
+rhino::format_sass()
+
+# Create bad scripts and test if formatting returns the expected result
+test_file_path <- fs::path("app", "styles", "bad-style.scss")
+cat("@import 'asdf';\nx+y{ color: red}", file = test_file_path)
+rhino::format_sass()
+testthat::expect_identical(
+  readLines(test_file_path),
+  c(
+    '@import "asdf";',
+    "x + y {",
+    "  color: red;",
+    "}"
+  )
+)
+
+# Clean up
+file.remove(test_file_path)