TL;DR - ESLint
- ESLint is the most popular JavaScript linting tool for finding and fixing code problems
- It enforces coding standards with configurable rules and automatic fixes
- Completely free and open-source
Pricing: Free forever
Best for: Individuals & startups
Score: 90/100
Pricing
Free
View pricing ESLint is completely free to use.
About ESLint
ESLint finds and fixes problems in JavaScript code. Configure rules, run on save or in CI, and catch issues before they cause bugs—the linter that defines JavaScript code quality.
The plugin ecosystem is vast. Rules are configurable. The community investment is enormous.
JavaScript developers consider ESLint essential tooling for maintaining code quality across projects.
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ESLint FAQ
Yes, ESLint is open source under MIT license. Completely free. Industry standard JavaScript linter.
ESLint is a JavaScript/TypeScript linter. Find and fix problems in code. Highly configurable with plugin ecosystem.
ESLint is mature with huge plugin ecosystem. Biome is faster but newer with fewer plugins. ESLint for customization; Biome for speed.
Flat Config is the new configuration format (eslint.config.js). Simpler than .eslintrc. Becoming the default in newer versions.