51.8k
Prettier
Prettier is an opinionated code formatter that enforces a consistent style by parsing your code and re-printing it with its own rules.
👨💻
Development✨
Code Quality🎨
Styling
Best Open-Source Code Quality Tools in 2026
Browse open-source code quality tools for linting, formatting, and project cleanup. ESLint finds and fixes problems in JavaScript with a pluggable ruleset. Biome formats and lints web projects through a CLI and LSP, and Depcheck flags unused npm dependencies. Use this list to keep structure and consistency without guessing which utility does what.
The most popular open-source Code Quality tool by GitHub stars is Prettier(51.8k stars), followed by ESLint(27.2k stars)and Biome(24.3k stars). This page lists the top 22 of 22 code quality tools in the directory, ranked by community adoption.
Quick comparison
| # | Tool | Stars | Language | License |
|---|---|---|---|---|
| 1 | Prettier Prettier is an opinionated code formatter that enforces a consistent style by parsing your code and re-printing it with its own rules. | 51.8k | JavaScript | MIT License |
| 2 | ESLint Find and fix problems in your JavaScript code with a pluggable linter tool. | 27.2k | JavaScript | MIT License |
| 3 | Biome Biome is a comprehensive toolchain for web projects, providing powerful formatting and linting capabilities through a CLI and LSP interface. Designed to help developers maintain code quality and consistency across their projects, Biome integrates seamlessly into modern workflows. | 24.3k | Rust | Apache License 2.0 |
| 4 | Difftastic A structural diff tool that understands syntax, highlighting changes in a detailed and precise manner. | 21.9k | Rust | MIT License |
| 5 | Type Fest A collection of essential TypeScript types that aid in static type checking and code quality enhancement. | 17.0k | TypeScript | Creative Commons Zero v1.0 Universal |
| 6 | Jscodeshift A toolkit for running codemods on JavaScript codebases, making it easier to automate code refactoring and migrations. | 10.0k | JavaScript | MIT License |
| 7 | Ts-migrate A powerful tool to facilitate the swift and seamless migration of JavaScript codebases to TypeScript. | 5.6k | TypeScript | MIT License |
| 8 | Jscpd A tool to detect copy/paste errors in programming source code, helping to maintain code quality and avoid duplication. | 5.5k | TypeScript | MIT License |
| 9 | Eslint-plugin-unicorn Comprehensive ESLint plugin providing more than 100 powerful and innovative rules to ensure code quality and consistency. | 5.0k | JavaScript | MIT License |
| 10 | Depcheck A tool to analyze your npm module and identify unused dependencies, ensuring a cleaner, more efficient project. | 4.9k | JavaScript | MIT License |
All 22 Code Quality tools
- 27.2k
ESLint
Find and fix problems in your JavaScript code with a pluggable linter tool.
👨💻 Development🟡 JavaScript✨ Code Quality - 24.3k
Biome
Biome is a comprehensive toolchain for web projects, providing powerful formatting and linting capabilities through a CLI and LSP interface. Designed to help developers maintain code quality and consistency across their projects, Biome integrates seamlessly into modern workflows.
👨💻 Development🛠️ Tools✨ Code Quality⌨️ CLI - 21.9k
Difftastic
A structural diff tool that understands syntax, highlighting changes in a detailed and precise manner.
👨💻 Development🛠️ Tools✨ Code Quality🔨 Utils - 17.0k
Type Fest
A collection of essential TypeScript types that aid in static type checking and code quality enhancement.
👨💻 Development🔷 TypeScript✨ Code Quality - 10.0k
Jscodeshift
A toolkit for running codemods on JavaScript codebases, making it easier to automate code refactoring and migrations.
👨💻 Development🛠️ Tools🟡 JavaScript✨ Code Quality - 5.6k
Ts-migrate
A powerful tool to facilitate the swift and seamless migration of JavaScript codebases to TypeScript.
👨💻 Development✨ Code Quality🟡 JavaScript🔷 TypeScript - 5.5k
Jscpd
A tool to detect copy/paste errors in programming source code, helping to maintain code quality and avoid duplication.
✨ Code Quality👨💻 Development🧪 Testing🔨 Utils - 5.0k
Eslint-plugin-unicorn
Comprehensive ESLint plugin providing more than 100 powerful and innovative rules to ensure code quality and consistency.
👨💻 Development✨ Code Quality🟡 JavaScript🛠️ Tools - 4.9k
Depcheck
A tool to analyze your npm module and identify unused dependencies, ensuring a cleaner, more efficient project.
👨💻 Development⚙️ DevOps✨ Code Quality - 3.6k
Harper
Harper is a grammar checker specifically designed for developers to ensure code comments and documentation are grammatically correct.
👨💻 Development✨ Code Quality📚 Documentation🛠️ Tools - 3.5k
Destiny
Destiny is a tool like Prettier, but for organizing and prettifying your project's file structure, enhancing code readability and project maintainability.
👨💻 Development✨ Code Quality🛠️ Tools Our Newsletter
Get new Code Quality tools right in your inbox
Get short emails with useful code quality projects, releases, and repos worth watching.
- 3.1k
Textlint
Textlint is a pluggable natural language linter specifically designed for linting text and markdown, enabling better writing quality through its extensible architecture.
👨💻 Development✨ Code Quality🛠️ Tools📚 Documentation - 2.9k
Eslint-plugin-perfectionist
An ESLint plugin for sorting various data such as objects, imports, types, enums, JSX props, and more.
👨💻 Development✨ Code Quality🛠️ Tools🟡 JavaScript - 2.6k
Ruler
Ruler lets you enforce consistent coding standards and rules across all coding agents, ensuring uniformity and quality in collaborative and AI-assisted development environments.
👨💻 Development✨ Code Quality🛠️ Tools - 2.1k
Ts-prune
A tool to find and remove unused exports in a TypeScript project, enhancing code cleanliness and maintainability.
👨💻 Development✨ Code Quality🔷 TypeScript - 2.1k
ESLint Plugin TailwindCSS
An ESLint plugin to enhance Tailwind CSS usage by ensuring proper structure and conventions are followed.
👨💻 Development🎨 Styling✨ Code Quality - 467
Precise-commits
Painlessly apply Prettier by only formatting lines you have modified. Ideal for teams that want to maintain code consistency while working on projects.
👨💻 Development✨ Code Quality🛠️ Tools - 375
Deadfile
A simple utility tool to find unused files in JavaScript projects, supporting ES5, ES6, React, Vue, and more.
👨💻 Development🟡 JavaScript🔨 Utils✨ Code Quality - 317
Transliterate
A library to convert Unicode characters to Latin characters using transliteration, enhancing text readability and compatibility.
🔨 Utils👨💻 Development✨ Code Quality - 258
Shrimpit
Shrimpit 🍤 is a handy CLI tool to analyze and check for unused JavaScript, JSX, and Vue template ES6 exports in your project, helping optimize and clean your codebase.
👨💻 Development⌨️ CLI✨ Code Quality🟡 JavaScript - 133
Scriptlint
Enforce naming standards for scripts in package.json to maintain consistency and improve readability.
👨💻 Development🛠️ Tools✨ Code Quality
Frequently asked questions
What is the best open-source code quality tool in 2026?
Prettier leads by GitHub stars(51.8k). Prettier is an opinionated code formatter that enforces a consistent style by parsing your code and re-printing it with its own rules.
Are these code quality tools free?
Yes. Every tool on this list is open source and free to use in your own projects. Many can be self-hosted.
How is this list ranked?
Tools are ranked by GitHub star count, a strong proxy for community adoption and active maintenance. Star counts are refreshed regularly.
Stay Updated!
Get notified about new tools and updates to existing ones.