biome

Initialize Biome in a project

$ biome init

$ biome check [path/to/directory]

$ biome format --write [path/to/directory]

$ biome lint [path/to/directory]

$ biome lint --write [path/to/directory]

$ biome check [path/to/file.js]

$ biome check --reporter=json [path/to/directory]

$ biome ci [path/to/directory]

biome command [options] [paths]

Biome is a fast code formatter, linter, and more for JavaScript, TypeScript, JSON, and CSS. It is designed as a unified toolchain to replace ESLint, Prettier, and other tools with a single, faster alternative.
Written in Rust, Biome provides exceptional performance - often 10-100x faster than JavaScript-based alternatives. It requires minimal configuration, with sensible defaults out of the box while remaining highly customizable through biome.json.
The tool integrates formatting and linting into a single pass, reducing overhead. Editor integrations provide real-time feedback, and the CLI supports various output formats for CI systems.

init

Create a biome.json configuration file.

Run linter and formatter checks.

Format source files.

Lint source files.

Check for CI environments (stricter mode).

Migrate from other tools (ESLint, Prettier).

Apply fixes and formatting to files.

Output format: summary, json, github, gitlab.

Path to configuration file.

Use VCS ignore files (.gitignore).

Don't error if no files match.

Minimum severity: info, warn, error.

Biome is relatively new and may not support all ESLint rules or Prettier options. Plugin systems are limited compared to ESLint. Some projects with unusual configurations may require adjustments during migration. CSS support is newer and less mature than JS/TS support.

Biome emerged from Rome Tools, a project started by Sebastian McKenzie (creator of Babel) in 2020. When Rome Tools Inc. ceased operations in 2023, the community forked the project as Biome under a new governance model. The fork quickly gained traction, maintaining the performance-focused Rust implementation while accelerating development under community stewardship.

eslint(1), prettier(1), deno(1)