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90 lines
2.4 KiB
Markdown
90 lines
2.4 KiB
Markdown
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# media_types
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A module that assists in resolving media types and extensions. It consumes the
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[mime-db](https://github.com/jshttp/mime-db) and provides API access to the
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information.
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## Usage
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### `lookup(path)`
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Lookup the content type associated with a file. The path can be just the
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extension or the full path name. If the content type cannot be determined the
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function returns `undefined`:
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```ts
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import { lookup } from "https://deno.land/x/std/media_types/mod.ts";
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lookup("json"); // "application/json"
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lookup(".md"); // "text/markdown"
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lookup("folder/file.js"); // "application/javascript"
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lookup("folder/.htaccess"); // undefined
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```
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### `contentType(type)`
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Return a full `Content-Type` header value for a given content type or
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extension. When an extension is used, `lookup()` is used to resolve the
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content type first. A default charset is added if not present. The
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function will return `undefined` if the content type cannot be resolved:
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```ts
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import { contentType } from "https://deno.land/x/std/media_types/mod.ts";
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import * as path from "https://deno.land/x/std/path/mod.ts";
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contentType("markdown"); // "text/markdown; charset=utf-8"
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contentType("file.json"); // "application/json; charset=utf-8"
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contentType("text/html"); // "text/html; charset=utf-8"
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contentType("text/html; charset=iso-8859-1"); // "text/html; charset=iso-8859-1"
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contentType(path.extname("/path/to/file.json")); // "application/json; charset=utf-8"
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```
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### `extension(type)`
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Return a default extension for a given content type. If there is not an
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appropriate extension, `undefined` is returned:
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```ts
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import { extension } from "https://deno.land/x/std/media_types/mod.ts";
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extension("application/octet-stream"); // "bin"
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```
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### `charset(type)`
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Lookup the implied default charset for a given content type. If the content
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type cannot be resolved, `undefined` is returned:
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```ts
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import { charset } from "https://deno.land/x/std/media_types/mod.ts";
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charset("text/markdown"); // "UTF-8"
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```
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### `extensions`
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A `Map` of extensions by content type, in priority order:
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```ts
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import { extensions } from "https://deno.land/x/std/media_types/mod.ts";
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extensions.get("application/javascript"); // [ "js", "mjs" ]
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```
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### `types`
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A `Map` of content types by extension:
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```ts
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import { types } from "https://deno.land/x/std/media_types/mod.ts";
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types.get("ts"); // "application/javascript"
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```
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---
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Adapted from [mime-type](https://github.com/jshttp/mime-types).
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MIT License.
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