Biome
Fast JavaScript/TypeScript toolchain that replaces ESLint + Prettier with a single Rust-based tool. Biome provides linting, formatting, import organization, and code quality checks 25-35x faster than ESLint+Prettier. Forked from Rome Tools, now actively maintained by the Biome community. Used by growing number of projects replacing the ESLint + Prettier combination with a single, faster tool. Ships as a CLI binary with no Node.js runtime required.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
No network calls, no auth, runs locally. MIT open source with Rust memory safety. Single binary with minimal dependencies. Excellent security profile for a local dev tool.
⚡ Reliability
Best When
You're building JavaScript/TypeScript projects and want fast, unified linting + formatting without the ESLint + Prettier configuration overhead.
Avoid When
You need ESLint plugin ecosystem (custom rules, framework-specific rules), non-JS/TS formatting, or have existing complex ESLint configurations that aren't worth migrating.
Use Cases
- • Replace ESLint + Prettier with a single Biome command that runs 25-35x faster for CI linting and formatting checks
- • Enforce consistent code style across agent-generated JavaScript/TypeScript code with Biome's formatter (Prettier-compatible output)
- • Run incremental linting on changed files only using Biome's VCS integration with git for fast CI feedback loops
- • Integrate Biome into editor (VS Code, Neovim, IntelliJ) for real-time linting and auto-formatting without ESLint overhead
- • Organize imports automatically on save using Biome's import organizer for clean, consistent TypeScript import ordering
Not For
- • Projects with complex ESLint plugins or custom rules not yet in Biome — Biome's rule coverage is growing but doesn't fully cover ESLint's plugin ecosystem
- • Python, Go, Rust, or other non-JS/TS languages — Biome is JavaScript/TypeScript only
- • Teams needing Prettier for all file types (CSS, HTML, Markdown, JSON) — Biome formats JS/TS/JSX/TSX/JSON; Prettier covers more file formats
Interface
Authentication
CLI tool — no auth required. Runs locally with no network calls.
Pricing
MIT open source, no commercial offering. Free forever.
Agent Metadata
Known Gotchas
- ⚠ Biome's formatter differs from Prettier in edge cases — projects migrating from Prettier may see minor formatting differences that require a one-time reformatting commit
- ⚠ biome.json configuration does not support extends from remote URLs (unlike ESLint) — configuration must be self-contained; shared configs distributed as npm packages
- ⚠ Biome's rule IDs differ from ESLint rule names — existing ESLint ignore comments (// eslint-disable) must be converted to biome-ignore comments
- ⚠ VSCode Biome extension disables formatting from other formatters — setting Biome as the default formatter explicitly in settings.json required for consistent behavior
- ⚠ Biome's import organizer groups imports differently from ESLint import plugins — auto-fix may reorganize imports in ways that trigger review if diff hygiene matters
- ⚠ JSON reporter output format is Biome-specific — CI tools parsing ESLint JSON output need adapters for Biome's diagnostic format
Alternatives
Full Evaluation Report
Detailed scoring breakdown, competitive positioning, security analysis, and improvement recommendations for Biome.
Scores are editorial opinions as of 2026-03-06.