Biome Has a Free Linter and Formatter — Replace ESLint + Prettier With One Tool

Your JavaScript Toolchain Is Too Complex

ESLint config: 47 lines. Prettier config: 12 lines. eslint-config-prettier to make them not fight each other. eslint-plugin-import for import sorting. 8 ESLint plugins for React, TypeScript, accessibility.

All to lint and format code.

Biome: One Tool to Replace Them All

Biome is a linter, formatter, and import sorter in a single binary. Written in Rust for speed.

The Speed Difference

ESLint + Prettier on large project: 45 seconds
Biome on same project: 0.5 seconds

90x faster. Your CI pipeline will thank you.

Zero Config Start

npm install --save-dev @biomejs/biome
npx biome init
npx biome check --write .

Three commands. Linting + formatting + import sorting. Done.

What It Replaces

Before	After
ESLint	Biome
Prettier	Biome
eslint-config-prettier	Not needed
eslint-plugin-import	Biome
@typescript-eslint/parser	Biome
@typescript-eslint/eslint-plugin	Biome
eslint-plugin-react	Biome
eslint-plugin-jsx-a11y	Biome

8 packages → 1 package. 200+ lines of config → 10 lines.

Config That Makes Sense

{
  "formatter": {
    "indentStyle": "space",
    "indentWidth": 2,
    "lineWidth": 100
  },
  "linter": {
    "rules": {
      "recommended": true,
      "complexity": {
        "noExcessiveCognitiveComplexity": "warn"
      }
    }
  },
  "organizeImports": {
    "enabled": true
  }
}

Editor Integration

• VS Code: Official extension with format-on-save
• IntelliJ/WebStorm: Official plugin
• Neovim: LSP support
• Zed: Built-in support

Migration From ESLint

npx biome migrate eslint --write

Biome reads your .eslintrc and generates equivalent biome.json. Most rules have direct equivalents.

What Biome Cannot Do Yet

• Some ESLint plugins have no equivalent (eslint-plugin-testing-library)
• Custom rules (ESLint allows custom rules, Biome does not yet)
• Markdown/CSS formatting (Prettier handles these)

For JavaScript and TypeScript projects, Biome covers 95%+ of what ESLint + Prettier do.

Try It

npm install --save-dev @biomejs/biome
npx biome check --write src/

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