Open-source linter software

436 open-source libraries, tools and applications tagged linter, ranked by how closely linter is their primary purpose, then by adoption and maintenance health. Each entry links to a page with sources, use cases and when to choose or avoid it.

436 products, primary matches first, then adoption-weighted; health v2 shown.

Product	Health v2	Stars	Maturity
llvm/llvm-project LLVM is a modular, reusable compiler and toolchain infrastructure that provides libraries, tools, and APIs for building compilers, optimize…	100	41132	active
ShellCheck ShellCheck is a command‑line static analysis tool that scans shell scripts for syntax errors, semantic problems, and portability issues. It…	68	40190	active
ShellCheck ShellCheck is a GPLv3 static analysis tool that finds bugs, pitfalls, and style issues in bash/sh shell scripts. It runs from the terminal,…	68	40190	stable
alibaba/p3c P3C is a collection of Alibaba Java coding guidelines implemented as PMD rules and IDE plugins. It helps enforce best practices and catch c…	32	30851	active
JavaScript Standard Style JavaScript Standard Style is a zero-configuration JavaScript style guide that ships as a CLI linter and automatic code fixer built on ESLin…	33	29432	stable
PostCSS PostCSS is a JavaScript framework for transforming CSS via a plugin ecosystem, parsing stylesheets into an AST that plugins can analyze and…	96	28975	stable
google-labs-code/design.md DESIGN.md is a format specification for describing a visual identity and design system to coding agents, combining YAML design tokens with …	77	28380	active
Biome Biome is a fast, Rust‑based toolchain for web projects that provides code formatting and linting. It can be used via a command‑line interfa…	91	25931	active
Biome Biome is a fast web toolchain written in Rust that provides a code formatter (97% Prettier-compatible) and a linter with 500+ rules for Jav…	91	25931	active
Oxc Oxc is a Rust‑based collection of high‑performance JavaScript and TypeScript tools, including a parser, linter, formatter, transformer, min…	95	23109	active
.NET Compiler Platform (Roslyn) Roslyn is the open-source .NET Compiler Platform implementing the C# and Visual Basic compilers with rich code analysis APIs. It exposes co…	67	20723	stable
realm/SwiftLint SwiftLint is a tool that enforces Swift style and conventions based on community-accepted style guide rules. It is built on SwiftSyntax wit…	95	19746	stable
LunarVim LunarVim is an opinionated IDE layer for Neovim that ships with sane defaults for autocompletion, LSP, linting, formatting, debugging, fuzz…	30	19257	active
Conventional Changelog commitlint is a CLI tool and library that lints git commit messages against the conventional commit format, with shareable npm-based config…	99	18776	active
NVIDIA/SkillSpector SkillSpector is a security scanner for AI agent skills used by Claude Code, Codex CLI, Gemini CLI, and MCP-based agents. It detects vulnera…	79	18115	active
Semgrep Semgrep is a fast, open-source static analysis tool that searches code, finds bugs, and enforces secure coding standards using rules that l…	95	16978	active
rust-lang/rust-analyzer rust-analyzer is a Language Server Protocol implementation providing IDE features for Rust, including code completion, go-to-definition, fi…	94	16902	stable
Harper Harper is an open-source, offline English grammar checker written in Rust that runs entirely on-device with millisecond lint times. It ship…	91	16712	active
typescript-eslint/typescript-eslint typescript-eslint is a monorepo providing the tooling that enables ESLint, Prettier, and other JavaScript tools to parse and lint TypeScrip…	95	16420	stable
vim-go vim-go is a Vim/Neovim plugin that adds full Go language support, including build, test, run, debug (delve), formatting, completion, and go…	64	16219	active
ast-grep ast-grep is a fast Rust-based CLI tool for structural search, linting, and rewriting of code using AST patterns instead of plain text match…	99	16189	active
microsoft/pyright Pyright is a full-featured, standards-based static type checker for Python built by Microsoft, designed for high performance on large codeb…	96	15654	active
pre-commit pre-commit is a framework for managing and maintaining multi-language Git pre-commit hooks. It automatically installs and runs hooks writte…	88	15593	stable
millionco/react-doctor React Doctor is a deterministic static analyzer CLI that scans React, React Native, Next.js, and related codebases for correctness, perform…	76	14909	active
lint-staged/lint-staged lint-staged is an npm CLI tool that runs arbitrary shell tasks, such as formatters and linters, against only the files staged in git. It is…	97	14741	stable
PHPStan PHPStan is an open-source static analysis tool for PHP that discovers bugs in code without running it. It understands PHPDocs, supports gen…	95	14125	stable
dense-analysis/ale ALE (Asynchronous Lint Engine) is a Vim/Neovim plugin that provides asynchronous linting and syntax checking while you type, plus code fixi…	63	14020	active
rust-lang/rust-clippy Clippy is the official Rust linter, a collection of over 800 lints that catch common mistakes and suggest more idiomatic code. It integrate…	76	13558	stable
PHP-CS-Fixer/PHP-CS-Fixer PHP CS Fixer is a command-line tool that detects and automatically fixes PHP coding standards issues. It ships with built-in rule sets (PER…	93	13555	stable
RuboCop RuboCop is a Ruby static code analyzer (linter) and code formatter that enforces the community Ruby Style Guide. It can automatically fix m…	100	12914	stable
Hadolint Hadolint is a smart Dockerfile linter written in Haskell that parses Dockerfiles into an AST and applies best-practice rules. It also lints…	95	12480	active
webpro-nl/knip Knip is a CLI linter that finds unused files, dependencies, and exports in JavaScript and TypeScript projects, including monorepos. It uses…	93	12401	active
stylelint/stylelint Stylelint is a CSS linter with over 100 built-in rules that helps developers avoid errors and enforce style conventions. It supports plugin…	96	11527	stable
super-linter/super-linter Super-linter is a containerized collection of curated linters and code analyzers for many programming languages, runnable as a GitHub Actio…	88	10608	active
mason.nvim mason.nvim is a Neovim plugin providing a portable package manager for installing and managing external editor tooling such as LSP servers,…	80	10485	active
SQLFluff SQLFluff is a dialect-flexible, configurable SQL linter and auto-formatter for Python. It supports many SQL dialects (BigQuery, Snowflake, …	95	9955	stable
reviewdog/reviewdog reviewdog is an automated code review CLI that integrates with any linter or static analysis tool regardless of programming language. It pa…	87	9668	active
Checkstyle Checkstyle is a static analysis tool that checks Java source code against configurable coding standards and style rules, such as naming, im…	99	9613	active
jsx-eslint/eslint-plugin-react An ESLint plugin providing React and JSX-specific linting rules for JavaScript codebases. It enforces best practices, catches common bugs, …	74	9292	active
securego/gosec gosec is a security scanner for Go source code that inspects the AST and SSA representations to detect common security problems. It include…	92	8961	active
nicklockwood/SwiftFormat SwiftFormat is a command-line tool and library for reformatting Swift code on macOS, Linux, and Windows. It also ships as an Xcode source e…	96	8932	active
prek prek is a fast Git hook manager written in Rust that runs hooks on your code before commits, on demand, or in CI, managing the tools and de…	86	8644	active
PyCQA/bandit Bandit is a security-oriented static analysis tool that finds common security issues in Python code. It parses each file into an AST, runs …	82	8285	active
golang/tools The golang.org/x/tools module provides packages and commands for static analysis of Go programs, including SSA IR, call graphs, and a modul…	95	8007	active
XO XO is an opinionated JavaScript/TypeScript linter that wraps ESLint with sensible, preconfigured defaults and bundled plugins. It works as …	96	7988	active
repowise-dev/repowise Repowise is a Python-based codebase intelligence tool that indexes code structure, call graphs, git history, tests, and architectural decis…	78	7464	active
Done-0/fuck-u-code A CLI code-quality analyzer that scores codebases 0-100 and produces humorous 'legacy-mess' reports across 14 languages using tree-sitter A…	71	7303	active
google/error-prone Error Prone is Google's static analysis tool that hooks into the Java compiler to catch common programming mistakes as compile-time errors.…	93	7252	active
sverweij/dependency-cruiser A CLI tool that analyzes and validates dependencies in JavaScript, TypeScript, LiveScript, and CoffeeScript projects against user-defined r…	97	7237	active
facebook/pyrefly Pyrefly is a fast Python type checker and language server written in Rust, providing CLI-based type checking plus IDE features like code na…	84	7094	stable
detekt detekt is a static code analysis tool for the Kotlin programming language that detects code smells and enforces configurable rule sets. It …	67	7089	active
PyCQA/isort isort is a Python utility and library that automatically sorts imports alphabetically and separates them into sections by type. It ships as…	95	6953	stable
Staticcheck Staticcheck is an advanced linter for the Go programming language that uses static analysis to find bugs, performance issues, and simplific…	88	6906	active
ktlint/ktlint Ktlint is an opinionated Kotlin linter with a built-in formatter that enforces a standard code style without configuration. It supports .ed…	78	6765	active
vuejs/language-tools Vue Language Tools is the official language tooling monorepo for Vue.js, providing a VS Code extension, a language server, and the vue-tsc …	96	6722	active
zizmor zizmor is a static analysis tool for CI/CD configurations, primarily GitHub Actions workflows, as well as Dependabot and pre-commit configs…	87	6714	active
larastan/larastan Larastan is a PHPStan extension that adds code analysis to Laravel applications, understanding Laravel's runtime magic to find bugs before …	99	6544	active
microsoft/rushstack Rush Stack is a Microsoft-hosted monorepo of tools for managing large-scale TypeScript monorepos, including the Rush build orchestrator, He…	77	6500	active
derailed/popeye Popeye is a read-only CLI tool that scans live Kubernetes clusters and reports potential issues with deployed resources and configurations.…	56	6397	active
markdownlint markdownlint is a Node.js static analysis library that checks Markdown/CommonMark files against a configurable library of style rules, supp…	77	6375	stable
antfu/eslint-config A shareable ESLint flat config preset by Anthony Fu that provides opinionated linting and auto-fix formatting for JavaScript, TypeScript, V…	90	6271	stable
Vale Vale is a fast, cross-platform command-line linter for prose that enforces editorial style guides on documentation. It is markup-aware, par…	98	6182	active
import-js/eslint-plugin-import An ESLint plugin providing rules that validate ES2015+ import/export syntax, catching misspelled file paths, import names, and module resol…	64	5953	stable
vimeo/psalm Psalm is an open-source static analysis tool for PHP that finds type-related bugs and security vulnerabilities through type inference and t…	98	5896	active
microsoft/typespec TypeSpec is a Microsoft-built, extensible DSL and toolchain for defining cloud service APIs and data shapes as a single source of truth. It…	95	5891	active
TFLint TFLint is a pluggable linter for Terraform that finds possible errors, deprecated syntax, and unused declarations, and enforces best practi…	89	5827	active
pylint Pylint is a static code analyzer for Python that checks code without running it. It detects errors, enforces coding standards like PEP8, an…	97	5726	stable
microsoft/typescript-go The staging repository for TypeScript 7.0, a native Go port of the TypeScript compiler (tsgo/tsc), offering dramatically faster type checki…	10	26180	maintenance
diffplug/spotless Spotless is a code formatting plugin for Gradle, Maven, and SBT that checks and automatically fixes formatting violations across many langu…	95	5686	stable
nunomaduro/phpinsights PHP Insights is a console tool that performs instant static analysis of PHP code quality, coding style, architecture, and complexity. It wo…	92	5635	active
phan/phan Phan is a static analyzer for PHP that finds bugs in code before it runs, focusing on type compatibility checking and minimizing false posi…	99	5630	active
mgechev/revive Revive is a fast, configurable, and extensible linter for Go, serving as a drop-in replacement for golint. It supports TOML-based rule conf…	90	5554	active
PMD PMD is an extensible multilanguage static code analyzer that finds common programming flaws like unused variables, empty catch blocks, and …	97	5494	stable
dmmulroy/anti-slop A set of opinionated Oxlint plugin rules that reject low-evidence TypeScript and JavaScript patterns, designed to be vendored into a reposi…	58	5492	active
python-mode/python-mode Python-mode is a Vim plugin that turns Vim into a Python IDE, bundling linting, formatting, code completion, refactoring, documentation loo…	57	5466	active
google/gts gts is Google's TypeScript style guide packaged as a zero-configuration CLI tool that bundles ESLint linting, Prettier formatting, and an o…	52	5290	active
supabase-community/postgres-language-server A Language Server Protocol implementation and toolchain for Postgres SQL, built on libpg_query for 100% syntax compatibility. It provides e…	95	5260	active
sindresorhus/eslint-plugin-unicorn An ESLint plugin offering more than 300 powerful lint rules for JavaScript and TypeScript, with some rules also covering CSS, HTML, JSON, M…	97	5254	active
Credo Credo is a static code analysis tool for the Elixir language with a focus on code consistency and teaching. It highlights refactoring oppor…	87	5222	stable
fallow Fallow is a Rust-based CLI that performs static analysis of TypeScript and JavaScript codebases, detecting unused code, duplication, circul…	79	5189	active
rome/tools Rome is a unified toolchain for JavaScript, TypeScript, and web projects, combining a linter, formatter, and other developer tools in a sin…	10	23372	maintenance
PyCQA/pycodestyle pycodestyle (formerly pep8) is a simple Python style guide checker that validates code against PEP 8 conventions. It ships as a single Pyth…	66	5168	stable
alex alex is a JavaScript-based linter that catches insensitive, inconsiderate writing such as gendered, ableist, or polarizing phrasing in text…	23	5105	active
didi/booster Booster is a lightweight, extensible quality optimization toolkit for mobile applications built as a Gradle plugin. It uses bytecode manipu…	62	5075	active
microsoft/tsdoc TSDoc is a proposed standard for TypeScript doc comments, with an open-source reference parser (@microsoft/tsdoc) that tools can use to ext…	66	4968	active
jendrikseipp/vulture Vulture is a static analysis CLI tool that finds unused (dead) code in Python programs, including unused functions, classes, variables, imp…	78	4852	active
anordal/shellharden Shellharden is a Rust CLI tool that syntax-highlights bash scripts and semi-automatically rewrites them to ShellCheck conformance, mainly b…	75	4809	stable
include-what-you-use/include-what-you-use Include What You Use (IWYU) is a Clang-based tool that analyzes #include directives in C and C++ source files. It detects superfluous inclu…	90	4778	active
hhatto/autopep8 autopep8 is a Python tool that automatically formats Python code to conform to the PEP 8 style guide. It uses pycodestyle to detect formatt…	61	4658	stable
GritQL GritQL is a declarative query language and Rust-based CLI for searching, linting, and rewriting source code using pattern matching over AST…	82	4602	active
eslint-plugin-vue The official ESLint plugin for Vue.js that lints the <template> and <script> sections of .vue single file components as well as Vue code in…	98	4588	stable
amperser/proselint proselint is a command-line linter for English prose that scans text files for style, usage, and clarity issues based on advice from renown…	68	4581	active
Lua Language Server A Language Server Protocol implementation for Lua, written in Lua, providing features like autocompletion, type checking, diagnostics, form…	100	4391	stable
k1LoW/tbls tbls is a CI-friendly command-line tool written in Go that automatically generates database documentation in GFM/Markdown and other formats…	98	4359	active
phpro/grumphp GrumPHP is a PHP code-quality tool implemented as a Composer plugin that registers git hooks in your repository. When a developer commits c…	89	4316	active
rhysd/actionlint actionlint is a static checker for GitHub Actions workflow files, written in Go. It validates syntax, type-checks ${{ }} expressions, verif…	78	4265	active
crate-ci/typos typos is a fast source code spell checker written in Rust that finds and corrects spelling mistakes in codebases. It is designed for low fa…	94	4182	active
troessner/reek Reek is a code smell detector for Ruby that examines classes, modules, and methods and reports code smells like uncommunicative names, long…	75	4131	active
uber/NullAway NullAway is an Error Prone plugin that performs fast, annotation-based nullability checking for Java code to eliminate NullPointerException…	99	4125	active
asottile/pyupgrade pyupgrade is a CLI tool and pre-commit hook that automatically rewrites Python source code to use modern syntax for newer Python versions. …	76	4115	active