Deno Standard Library

High-quality APIs for Deno and the web. Use fearlessly.

Get Started

import { copy } from "https://deno.land/std@$STD_VERSION/fs/copy.ts";

await copy("./foo", "./bar");

See here for recommended usage patterns.

Documentation

Check out the documentation here.

Recommended Usage

1. Include the version of the library in the import specifier.

   Good:

   import { copy } from "https://deno.land/std@0.204.0/fs/copy.ts";
   

2. Only import modules that you require.

   Bad (when using only one function):

   import * as fs from "https://deno.land/std@$STD_VERSION/fs/mod.ts";
   

   Good (when using only one function):

   import { copy } from "https://deno.land/std@$STD_VERSION/fs/copy.ts";
   

   Good (when using multiple functions):

   import * as fs from "https://deno.land/std@$STD_VERSION/fs/mod.ts";
   

3. Do not import symbols with an underscore in the name.

   Bad:

   import { _format } from "https://deno.land/std@$STD_VERSION/path/_common/format.ts";
   

4. Do not import modules with an underscore in the path.

   Bad:

   import { filterInPlace } from "https://deno.land/std@$STD_VERSION/collections/_utils.ts";
   

5. Do not import test modules or test data.

   Bad:

   import { test } from "https://deno.land/std@$STD_VERSION/front_matter/test.ts";
   

Stability

Sub-module	Status
archive	Unstable
assert	Stable
async	Stable
bytes	Stable
collections	Stable
console	Unstable
csv	Stable
datetime	Unstable
dotenv	Unstable
encoding	Unstable
flags	Unstable
fmt	Stable
front_matter	Unstable
fs	Stable
html	Unstable
http	Unstable
io	Deprecated
json	Stable
jsonc	Stable
log	Unstable
media_types	Stable
msgpack	Unstable
path	Unstable
permissions	Deprecated
regexp	Unstable
semver	Unstable
signal	Deprecated
streams	Unstable
testing	Stable
toml	Stable
ulid	Unstable
url	Unstable
uuid	Stable
wasi	Deprecated
yaml	Stable

For background and discussions regarding the stability of the following sub-modules, see #3489.

Contributing

Check out the contributing guidelines here.

Releases

The Standard Library is versioned independently of the Deno CLI. This will change once the Standard Library is stabilized. See here for the compatibility of different versions of the Deno Standard Library and the Deno CLI.