eslint

ESLint is the standard linting tool for JavaScript and TypeScript that analyzes your code to find and fix problems, enforce coding conventions, and catch potential bugs before they reach production. ESLint uses a pluggable architecture where rules are individually configurable — each rule can be turned off, set to warn, or set to error, and many rules accept additional configuration options. The tool parses source code into an AST and applies rules that check for patterns, with auto-fix capabilities for many common issues. ESLint's flat config system (eslint.config.js) provides a simpler, more powerful configuration model. The ecosystem includes thousands of rules through plugins like @typescript-eslint for TypeScript-specific rules, eslint-plugin-react for React patterns, eslint-plugin-import for module import conventions, eslint-plugin-jsx-a11y for accessibility checks, and eslint-plugin-security for security anti-patterns. ESLint integrates with all major editors for real-time feedback, with CI pipelines for enforcing standards, and with Git hooks through lint-staged and Husky for pre-commit checks. ESLint has become an indispensable part of modern JavaScript development workflows.