Code linters & formatters: top picks for 2026

Design guidance for AI coding agents, with a design skill, 24 commands, live browser iteration and 61 deterministic detector rules for AI-generated frontend UI.

An opinionated code formatter that re-prints JavaScript, TypeScript, CSS, HTML, Markdown, YAML and more to a consistent style.

An extremely fast Python linter and code formatter written in Rust, with over 900 lint rules and Black-compatible formatting.

Black is an opinionated, deterministic Python code formatter that rewrites files in place with minimal diffs.

A static analysis tool that finds bugs, portability problems and bad habits in bash and sh shell scripts.

A desktop Swiss Army knife for developers, bundling about 30 small tools for encoding, formatting, converting, testing and generating data.

A JavaScript tool for transforming CSS with plugins, used to lint, prefix, nest, minify and extend stylesheets.

A pluggable linter for ECMAScript/JavaScript that finds problematic patterns in code and can automatically fix many of them.

A Rust-based toolchain for web projects that provides a formatter and linter for JavaScript, TypeScript, JSX, JSON, CSS and more, via CLI and LSP.

A collection of high-performance JavaScript and TypeScript tools written in Rust, including a parser, linter, formatter, transformer, minifier and resolver.

A static type checker for Python that finds type errors in code with PEP 484 type hints without running it.

A linter that enforces Swift style and conventions, with over 200 rules that can be configured per project.

A fast Go linters runner that executes many linters in parallel with caching and YAML configuration.

Fast, open-source static analysis CLI that finds bugs and enforces coding standards using code-like patterns instead of regex or ASTs.

A CLI tool that searches, lints, and rewrites code by matching abstract syntax tree patterns instead of plain text.

Monorepo of tooling that lets ESLint parse and lint TypeScript code, including the parser, rules and plugin packages.

A framework for managing and running multi-language pre-commit hooks that check code before each Git commit.

Runs formatters and linters only on git-staged files before each commit, so unchecked code stays out of the repository.

A Vim and Neovim plugin that lints code asynchronously while you type, runs fixers like prettier and eslint, and acts as an LSP client.

A Python code formatter that reformats source files to a configurable style, based on clang-format's layout algorithm.

A Rust linter with over 800 lints that catches common mistakes and suggests more idiomatic code, run as a cargo subcommand.

A PHP command-line tool that automatically fixes code to follow PHP coding standards such as PER-CS and Symfony.

A Ruby static code analyzer and formatter that enforces community Ruby Style Guide rules and can auto-fix many violations.

Finds unused files, dependencies and exports in JavaScript and TypeScript projects so you can remove dead code before shipping.

A Dockerfile linter written in Haskell that checks best practices and lints the Bash inside RUN instructions with ShellCheck.

A CSS linter that catches errors in stylesheets and enforces coding conventions, with over 100 built-in rules and auto-fix support.

A small, extensible logging library for Android that wraps the platform Log class with pluggable Tree backends.

A ready-to-run collection of linters and formatters that runs as a GitHub Action or standalone container to check and fix source code.

A dialect-flexible SQL linter and auto-formatter that checks and fixes SQL style and errors, including Jinja and dbt templated code.

A Go CLI that runs any linter or code analysis tool and posts its findings as review comments on GitHub, GitLab or Bitbucket, limited to changed lines.