Directory

Open Source Packages

Libraries, frameworks, tools, and SDKs used by the apps in this directory — scored the same way as the apps themselves.

5929 packages

All Packages

97Health
Tool npm

TypeScript

A strongly typed superset of JavaScript that compiles to clean, portable JavaScript.

111,245
Apache 2.0
Used by 503
95Health
Tool npm

ESLint

The pluggable JavaScript and TypeScript linter that finds and fixes code problems through a fully customizable, plugin-based rule engine.

27,518
MIT
Used by 368
94Health
Tool npm

Vite

Next-generation frontend build tool with an instant dev server, lightning-fast HMR, and optimized production builds.

83,048
MIT
Used by 326
91Health
Tool npm

prettier

An opinionated code formatter that enforces consistent style across every language your project speaks.

52,316
MIT
Used by 310
93Health
Tool npm

Vitest

A blazing-fast unit testing framework powered by Vite, with Jest-compatible APIs out of the box.

17,166
MIT
Used by 296
94Health
Tool npm

typescript-eslint

The official meta-package bundling the TypeScript ESLint parser, plugin, and rule presets behind a single typed config() helper.

16,401
MIT
Used by 260
92Health
Framework npm

Playwright

Cross-browser end-to-end web testing and browser automation with a single API for Chromium, Firefox, and WebKit.

96,772
Apache 2.0
Used by 229
93Health
Tool npm

@vitejs/plugin-react

The official Vite plugin for React with Babel-powered Fast Refresh and JSX transforms

1,167
MIT
Used by 211
88Health
Tool npm

tsx

A drop-in replacement for the node CLI that runs TypeScript and ESM files instantly, powered by esbuild.

12,162
MIT
Used by 177
68Health
Tool npm

eslint-config-prettier

Disables ESLint stylistic rules that conflict with Prettier, so the two tools never fight over formatting.

5,893
MIT
Used by 169
95Health
Framework npm

React Router

A multi-strategy router for React, from a lightweight library to a full SSR framework.

56,590
MIT
Used by 167
85Health
Framework npm

Express

The fast, unopinionated, minimalist web framework for Node.js

69,493
MIT
Used by 158
96Health
Framework npm

Next.js

The React framework for production: file-based routing, server rendering, and Rust-powered builds.

142,803
MIT
Used by 154
95Health
Tool npm

jest

Delightful JavaScript testing with zero-config setup, snapshots, mocking, and coverage

45,465
MIT
Used by 149
81Health
Tool npm

esbuild

An extremely fast JavaScript and CSS bundler and minifier written in Go.

40,071
MIT
Used by 139
52Health
Tool npm

ts-node

TypeScript execution engine and REPL for Node.js that runs .ts files directly, without a separate compile step.

13,120
MIT
Used by 122
61Health
Tool npm

eslint-plugin-react

React-specific linting rules for ESLint that catch JSX bugs, enforce Hooks conventions, and keep prop usage consistent.

9,293
MIT
Used by 122
89Health
Tool npm

lint-staged

Run linters and formatters only against the files staged in git, so a slow full-project lint never blocks a commit.

14,736
MIT
Used by 120
47Health
Tool npm

cross-env

Cross-platform CLI for setting environment variables in npm scripts without worrying about Windows vs POSIX syntax.

6,523
MIT
Used by 118
78Health
Tool npm

eslint-plugin-import

ESLint rules that validate ES module import/export syntax and catch broken paths before they hit your build.

5,947
MIT
Used by 116
91Health
Tool npm

Sass

The reference Dart implementation of Sass, the mature CSS preprocessor that compiles SCSS and indented syntax to standards-compliant CSS.

4,225
MIT
Used by 108
78Health
Tool npm

concurrently

Run multiple terminal commands in parallel, with color-coded output and cross-platform support.

7,857
MIT
Used by 104
61Health
Tool npm

eslint-plugin-prettier

Run Prettier as an ESLint rule that reports formatting differences as autofixable lint errors.

3,653
MIT
Used by 102
96Health
Framework PyPI

pytest

The Python testing framework that makes writing small tests easy and scales to complex functional test suites.

14,543
MIT
Used by 100

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