biome

Biome is a single binary that formats, lints and sorts imports for web projects — JavaScript, TypeScript, JSX/TSX, JSON/JSONC, CSS, GraphQL and HTML — replacing a Prettier + ESLint stack with one tool and no Node, npm or plugin tree to install. It grew out of Rome Tools and is written in Rust.

Formatting is Prettier-compatible by design (upstream reports ~97 % agreement on their test suite), and the linter ships hundreds of rules, many carrying safe or suggested automatic fixes.

What's included

• biome — the CLI. biome format formats, biome lint lints, biome check runs formatter + linter + import sorting together, and each takes --write to apply fixes in place. biome ci is the non-writing variant for pipelines, biome init scaffolds a biome.json, biome migrate updates it across breaking changes, biome explain <rule> prints a rule's documentation, and biome lsp-proxy speaks LSP over stdin/stdout for editor integration.

Reports can be emitted for other tools with --reporter=<json|junit|github|gitlab|checkstyle|rdjson|sarif|summary|concise>.

Quick start

biome check --write ./src            # format + lint + organise imports, in place
biome format --write ./src           # formatting only
biome lint ./src                     # lint only, exits non-zero on findings
biome ci ./src                       # CI mode: never writes, reports and exits

Configuration is optional — Biome runs on sensible defaults with no config file at all. biome init writes a biome.json when you want to change them:

{
  "formatter": { "indentStyle": "space", "indentWidth": 2 },
  "linter": { "rules": { "recommended": true } }
}

Links

• Biome website
• biome on GitHub
• CLI reference
• Configuration reference
• Lint rule index