deno fmt, code formatting
Command line usage:
deno fmt [OPTIONS] [files]...Auto-format various file types.
deno fmt myfile1.ts myfile2.ts
Supported file types are:
JavaScript, TypeScript, Markdown, JSON(C) and Jupyter Notebooks
Supported file types which are behind corresponding unstable flags (see formatting options):
HTML, CSS, SCSS, SASS, LESS, YAML, Svelte, Vue, Astro and Angular
Format stdin and write to stdout:
Check if the files are formatted:
Ignore formatting code by preceding it with an ignore comment:
Ignore formatting a file by adding an ignore comment at the top of the file:
--config Jump to heading#
Short flag: -c
Configure different aspects of deno including TypeScript, linting, and code formatting. Typically the configuration file will be called deno.json or deno.jsonc and automatically detected; in that case this flag is not necessary.
--no-config Jump to heading#
Disable automatic loading of the configuration file.
--permit-no-files Jump to heading#
Don't return an error code if no files were found.
Formatting options Jump to heading#--check Jump to heading#
Check if the source files are formatted.
--ext Jump to heading#
Set content type of the supplied file.
--ignore Jump to heading#
Ignore formatting particular source files.
--indent-width Jump to heading#
Define indentation width [default: 2]
--line-width Jump to heading#
Define maximum line width [default: 80]
--no-semicolons Jump to heading#
Don't use semicolons except where necessary [default: false]
--prose-wrap Jump to heading#
Define how prose should be wrapped [default: always]
--single-quote Jump to heading#
Use single quotes [default: false]
--unstable-component Jump to heading#
Enable formatting Svelte, Vue, Astro and Angular files.
--unstable-sql Jump to heading#
Enable formatting SQL files.
--use-tabs Jump to heading#
Use tabs instead of spaces for indentation [default: false]
File watching options Jump to heading#--no-clear-screen Jump to heading#
Do not clear terminal screen when under watch mode.
--watch Jump to heading#
Watch for file changes and restart process automatically. Only local files from entry point module graph are watched.
--watch-exclude Jump to heading#
Exclude provided files/patterns from watch mode.
Supported File Types Jump to heading#Deno ships with a built-in code formatter that will auto-format the following files:
File Type Extension Notes JavaScript.js, .cjs, .mjs TypeScript .ts, .mts, .cts JSX .jsx TSX .tsx Markdown .md, .mkd, .mkdn, .mdwn, .mdown, .markdown JSON .json JSONC .jsonc CSS .css HTML .html Nunjucks .njk Vento .vto YAML .yml, .yaml Sass .sass SCSS .scss LESS .less Jupyter Notebook .ipynb Astro .astro Requires --unstable-component flag or "unstable": ["fmt-component"] config option. Svelte .svelte Requires --unstable-component flag or "unstable": ["fmt-component"] config option. Vue .vue Requires --unstable-component flag or "unstable": ["fmt-component"] config option. SQL .sql Requires --unstable-sql flag or "unstable": ["fmt-sql"] config option.
Note
deno fmt can format code snippets in Markdown files. Snippets must be enclosed in triple backticks and have a language attribute.
Ignore formatting code by preceding it with a // deno-fmt-ignore comment:
export const identity = [
1, 0, 0,
0, 1, 0,
0, 0, 1,
];
Or ignore an entire file by adding a // deno-fmt-ignore-file comment at the top of the file.
Ignore formatting next item by preceding it with <!--- deno-fmt-ignore --> comment:
<html>
<body>
<p>
Hello there
</p>
</body>
</html>
To ignore a section of code, surround the code with <!-- deno-fmt-ignore-start --> and <!-- deno-fmt-ignore-end --> comments.
Or ignore an entire file by adding a <!-- deno-fmt-ignore-file --> comment at the top of the file.
Ignore formatting next item by preceding it with # deno-fmt-ignore comment:
# deno-fmt-ignore aaaaaa: bbbbbbb
For more information about linting and formating in Deno, and the differences between these two utilities, visit the Linting and Formatting page in our Fundamentals section.
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