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ESLint vs Prettier vs Biome (2026): Which Code Formatter Wins?
Every JavaScript project needs linting and formatting — but the tooling landscape has shifted dramatically in 2026. Biome, the Rust-powered linter + formatter, has matured into a serious contender against the incumbents ESLint and Prettier. This comparison covers the key differences, migration paths, and whether it is time to switch.
Quick Comparison
| Feature | ESLint | Prettier | Biome |
|---|---|---|---|
| Type | Linter (rules-based) | Formatter (opinionated) | Linter + Formatter (unified) |
| Language | JavaScript | JavaScript | Rust |
| Speed (format 1,000 files) | N/A (lint only) | ~12 seconds | ~0.5 seconds (25x faster) |
| Speed (lint 1,000 files) | ~30 seconds | N/A | ~1.2 seconds (25x faster) |
| Supported Languages | JS, TS, JSX, TSX | JS, TS, JSX, TSX, JSON, CSS, HTML, YAML, Markdown | JS, TS, JSX, TSX, JSON, CSS (growing) |
| Plugin Ecosystem | 3,000+ plugins, 300+ configs | Minimal (opinionated by design) | Built-in rules (growing, no external plugins yet) |
| Config Format | JS, JSON, YAML, eslint.config.js | .prettierrc (JSON/YAML/JS) | biome.json (JSON/JSONC) |
| VSCode Integration | Excellent | Excellent | Excellent (one extension for both) |
| CI/CD | eslint CLI, reviewdog | prettier --check | biome ci (combined lint + format check) |
| Auto-Fix | Yes (--fix) | Yes (--write) | Yes (biome check --write, both lint + format) |
ESLint — The Incumbent
Best for: Projects that need highly customized linting rules, TypeScript-specific checks, or framework-specific rules (React, Vue, Svelte). The plugin ecosystem is the moat — eslint-plugin-import, eslint-plugin-unicorn, and @typescript-eslint cover edge cases Biome cannot yet touch. Weak spot: Slow on large codebases; configuration sprawl; requires separate Prettier setup for formatting.
Prettier — The Standard
Best for: Teams that value consistency over customizability. Prettier's opinionated approach eliminates formatting debates. Weak spot: Speed on very large repos; limited configurability; formatting-only means you still need ESLint for code quality rules.
Biome — The Challenger
Best for: New projects that want fast, unified linting + formatting without juggling two tools. Biome's speed (25x faster than both) is genuinely noticeable in CI. Weak spot: No plugin system yet — you cannot write custom rules or use community plugins. For projects heavily invested in ESLint plugins, Biome is not a drop-in replacement.
Decision Matrix
| Situation | Best Choice | Why |
|---|---|---|
| New project, fresh start | Biome | Fast, unified, modern, no legacy config |
| Large monorepo, slow CI | Biome | 25x speed improvement in lint/format CI step |
| Heavy ESLint plugin usage | ESLint + Prettier | Biome cannot replace custom ESLint plugins yet |
| Maximum consistency | Prettier + Biome (linter) | Prettier for formatting, Biome for linting (faster than ESLint) |
Bottom line: Biome is ready for production in 2026 — for most projects, the speed win alone justifies the switch. The main blocker is plugin dependencies. If your ESLint setup is "eslint:recommended + @typescript-eslint + prettier," Biome can replace all of it today. See also: Prettier vs Biome and TypeScript Advanced Patterns.
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