Technologies
What is next.js built with?
next.js is a JavaScript repo built with React, Express, Tokio, scheduler, Next.js, and 1 more. It stores its data in concurrent-queue, makes its content with Cheerio, js-yaml, image, and sharp, validates its data with prop-types and Ajv, is tested with libfuzzer-sys, playwright, Testing Library, Jest, @playwright/test, and 1 more, and deploys with tracing, tracing-subscriber, OpenTelemetry, and pino. It has 5,697 files and 2,391,614 written lines, with 18,587 test files.
Read on November 4, 2026, at commit 97f1a2c. Read it as markdown
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Frontend
The base
Styles
- styled-jsx7 files
- emotion5 files
- Tailwind CSS4 files
- PostCSS3 files
geist1 file
Interface
- MUI9 files
- react-virtualized2 files
- Framer1 file
- Headless UI1 file
Icons
@heroicons/react3 files
- Lucide2 files
Backend
The base
- Express1 file
Data
- concurrent-queue3 files
Support
The base
- Tokio77 files
- scheduler1 file
Content
- Cheerio135 files
- js-yaml4 files
- image1 file
- sharp1 file
Validation
- prop-types2 files
- Ajv1 file
Testing
- libfuzzer-sys
- playwright92 files
- Testing Library8 files
- Jest2 files
Deploy
- tracing114 files
- tracing-subscriber7 files
- OpenTelemetry1 file
- pino1 file
Tools
- ESLint22 files
- syn22 files
- quote20 files
- napi-derive18 files
- proc-macro216 files
- get-port11 files
- clap10 files
- expect-type5 files
- dhat2 files
- SWC2 files
- Prettier1 file
- resolve-from1 file
tsx1 file
yargs1 file
Other
- getrandom
- walkdir
- anyhow530 files
- bincode192 files
- rustc-hash147 files
- serde118 files
- serde_json94 files
- async-trait83 files
- fs-extra70 files
- smallvec58 files
- regex41 files
- either39 files
- parking_lot32 files
- futures28 files
- indexmap24 files
- execa21 files
- tempfile16 files
- escape-string-regexp15 files
- thread_local12 files
- urlencoding12 files
- http-proxy11 files
- postcard10 files
- hashbrown9 files
- itertools9 files
- rand9 files
- memmap28 files
- byteorder7 files
- bytes6 files
- data-encoding6 files
- flate26 files
- Hyper6 files
- zstd6 files
- libc5 files
- napi5 files
- url5 files
- windows-sys5 files
- base644 files
- futures-util4 files
- num-bigint4 files
- pathdiff4 files
- phf4 files
- sha24 files
- thiserror4 files
- Lodash3 files
- rayon3 files
- include_dir2 files
- jiff2 files
- js-sys2 files
- memchr2 files
- notify2 files
- num-traits2 files
- percent-encoding2 files
- SWR2 files
- tokio-util2 files
- wasm-bindgen2 files
- wasm-bindgen-futures2 files
- .ENV1 file
- arrayvec1 file
- bitflags1 file
- chrono1 file
- console_error_panic_hook1 file
- crc32fast1 file
- crossbeam-channel1 file
- hex1 file
- minimatch1 file
- moment1 file
- nix1 file
- num_cpus1 file
- regex-automata1 file
- reqwest1 file
- rustls1 file
- same-file1 file
- sha11 file
- Socket.io1 file
- socket.io-client1 file
- socket21 file
- terminal_size1 file
- undici1 file
- unicode-width1 file
- uuid1 file
- webbrowser1 file
- whatwg-fetch1 file
apps/bundle-analyzer
Frontend
The base
Styles
- Tailwind CSS
class-variance-authority2 files
- next-themes2 files
tailwind-merge1 file
Icons
- Lucide12 files
Support
Other
- clsx2 files
- SWR2 files
packages/create-next-app
Frontend
Interface
- prompts1 file
Support
Tools
- fast-glob2 files
Other
- picocolors5 files
packages/devlow-bench
Support
Tools
- Inquirer1 file
Other
- picocolors3 files
- minimist1 file
- split21 file
- url1 file
packages/eslint-config-next
Support
Tools
- ESLint5 files
typescript-eslint2 files
- eslint-plugin-import1 file
- eslint-plugin-jsx-a11y1 file
- eslint-plugin-react1 file
- eslint-plugin-react-hooks1 file
- globals1 file
packages/eslint-plugin-internal
Support
Tools
- ESLint1 file
packages/eslint-plugin-next
Support
Tools
- ESLint5 files
- fast-glob1 file
packages/next-codemod
Frontend
Support
Content
- Cheerio1 file
Other
- execa3 files
- picocolors3 files
packages/next-codemod/bin/__testfixtures__/react-18-installed-mixed-router
Frontend
packages/next-codemod/bin/__testfixtures__/react-18-installed-pure-pages-router
Frontend
packages/next-codemod/bin/__testfixtures__/react-19-installed-mixed-router
Frontend
packages/next-codemod/bin/__testfixtures__/react-19-installed-pure-pages-router
Frontend
packages/next-env
Support
Tools
- dotenv-expand1 file
Other
- .ENV1 file
packages/next-mdx
Support
Tools
- @mdx-js/loader1 file
packages/next-playwright
Support
Testing
@playwright/test1 file
packages/next-polyfill-nomodule
Support
Other
core-js1 file
- object-assign1 file
- whatwg-fetch1 file
packages/next-swc
Support
Other
- url1 file
packages/next
Frontend
The base
Styles
- PostCSS2 files
- styled-jsx2 files
Support
The base
- react-server-dom-webpack18 files
Content
- sharp1 file
Testing
- Testing Library2 files
msw1 file
Tools
- Babel2 files
- resolve-from1 file
- SWC1 file
Other
- url23 files
- execa1 file
packages/next/src/compiled/@edge-runtime/primitives
Support
Other
- url2 files
packages/next/src/compiled/@mswjs/interceptors/ClientRequest
Support
Other
- url1 file
packages/next/src/compiled/@vercel/nft
Support
Other
- url1 file
packages/next/src/compiled/@vercel/og
Support
Content
- sharp1 file
Other
- url1 file
packages/next/src/compiled/@vercel/routing-utils
Support
Other
- url1 file
packages/next/src/compiled/babel-packages
Support
Other
packages/next/src/compiled/babel
Support
Other
- url1 file
packages/next/src/compiled/edge-runtime
Support
Other
- url1 file
packages/next/src/compiled/http-proxy-agent
Support
Other
- url1 file
packages/next/src/compiled/https-browserify
Support
Other
- url1 file
packages/next/src/compiled/https-proxy-agent
Support
Other
- url1 file
packages/next/src/compiled/loader-runner
Support
Other
- url1 file
packages/next/src/compiled/postcss-flexbugs-fixes
Frontend
Styles
- PostCSS1 file
packages/next/src/compiled/postcss-preset-env
Frontend
Styles
- PostCSS1 file
Support
Other
- url1 file
packages/next/src/compiled/postcss-safe-parser
Frontend
Styles
- PostCSS1 file
packages/next/src/compiled/postcss-scss
Frontend
Styles
- PostCSS1 file
packages/next/src/compiled/react-server-dom-turbopack-experimental
Frontend
packages/next/src/compiled/react-server-dom-turbopack
Frontend
packages/next/src/compiled/react-server-dom-webpack-experimental
Frontend
Support
The base
- react-server-dom-webpack1 file
Tools
- acorn-loose2 files
Other
- url2 files
packages/next/src/compiled/react-server-dom-webpack
Frontend
Support
The base
- react-server-dom-webpack1 file
Tools
- acorn-loose2 files
Other
- url2 files
packages/next/src/compiled/sass-loader
Frontend
Styles
- Sass1 file
Support
Other
- url1 file
packages/next/src/compiled/serve-handler
Support
Other
- url1 file
packages/next/src/compiled/source-map08
Support
Other
- url1 file
packages/next/src/compiled/stream-http
Support
Other
- url1 file
packages/next/src/compiled/webpack
Support
Other
- url1 file
packages/next/src/compiled/ws
Support
Other
- url1 file
packages/react-refresh-utils
Support
Tools
react-refresh4 files
packages/third-parties
Frontend
rspack/crates/binding
Support
Tools
- napi-derive1 file
Other
- anyhow
- napi
- serde_json
- rustc-hash3 files
- regex1 file
turbopack/crates/turbopack-ecmascript-runtime/js
Support
Other
- url2 files
turbopack/crates/turbopack-node/js
Frontend
Styles
- PostCSS1 file
Support
Other
- url1 file
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