Language support
Oxfmt formats a wide range of file types. Most are handled by Oxfmt's own native engine, written in Rust. The rest are delegated to a bundled Prettier for languages Oxfmt has not yet reimplemented natively. We are actively porting every language to Rust for maximum performance, so the Prettier-backed list keeps shrinking as native support lands.
INFO
Native formats run entirely in Rust with no Node.js round-trip, so they are the fastest. Prettier-backed formats ship inside the oxfmt package and need no extra setup. Except .svelte, which additionally requires the svelte package to be installed and the svelte option to be enabled.
Native
Formatted directly by Oxfmt, with no Prettier dependency:
| Language | Extensions |
|---|---|
| JavaScript / JSX | .js, .jsx, .mjs, .cjs, and more |
| TypeScript / TSX | .ts, .tsx, .mts, .cts, .d.ts |
| JSON / JSONC / JSON5 | .json, .jsonc, .json5 |
| CSS / SCSS / Less | .css, .scss, .less, .pcss, .postcss |
| GraphQL | .graphql, .gql, .graphqls |
| TOML | .toml |
| YAML | .yml, .yaml |
Detection also covers many well-known config files by name. For example .babelrc and .swcrc are treated as JSON.
Prettier-backed
Delegated to the bundled Prettier. No separate prettier install is required.
WARNING
These formats require Node.js and are only available with the oxfmt npm package. The standalone binary from GitHub Releases skips these files. See Quickstart for details.
TIP
These are being actively ported to Rust. As each native formatter lands, its language moves to the Native list above for maximum performance. No change needed on your side.
| Language | Extensions |
|---|---|
| HTML | .html, .htm, .xhtml |
| Angular | *.component.html |
| Vue | .vue |
| Svelte | .svelte |
| Markdown | .md, .markdown |
| MDX | .mdx |
| Handlebars | .hbs, .handlebars |
| MJML | .mjml |
Embedded languages
Oxfmt also formats code embedded inside JS/TS template literals. The same split as above applies: languages in the Native list are formatted natively, while those in the Prettier-backed list go through Prettier. See Embedded Formatting for details and examples.
For Vue and Svelte files, embedded JS/TS (such as <script> blocks) is formatted by native formatter rather than Prettier. Embedded JS/TS in the other Prettier-backed formats (such as <script> tags in HTML) is still formatted by Prettier.
See also
- Compatibility matrix — framework- and file-type-level support at a glance
- Unsupported features