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The ultimate javascript content-type utility.
Detect the file type of a file, stream, or data
Quick Overview
The broofa/mime
project is a comprehensive library for determining the MIME type of a file or file extension. It provides a simple and efficient way to identify the content type of various file formats, making it a useful tool for web development, file handling, and content management applications.
Pros
- Extensive MIME Type Coverage: The library supports a wide range of MIME types, covering a diverse set of file formats, from common document types to multimedia and application-specific formats.
- Cross-Platform Compatibility: The library is designed to work across different platforms, including Node.js, the browser, and other JavaScript environments.
- Actively Maintained: The project is actively maintained, with regular updates and bug fixes, ensuring its continued reliability and relevance.
- Lightweight and Dependency-Free: The library is lightweight and does not have any external dependencies, making it easy to integrate into projects without adding significant overhead.
Cons
- Limited Extensibility: While the library covers a wide range of MIME types, it may not include support for some more obscure or custom file formats. Users may need to extend the library's functionality in such cases.
- Potential for Outdated MIME Type Definitions: As new file formats and MIME types emerge, the library's definitions may not always be up-to-date, requiring manual updates or community contributions to keep it current.
- Lack of Advanced Features: The library is focused on the core functionality of MIME type detection and does not provide additional features, such as file type validation or content analysis.
- Potential Performance Impact: While the library is lightweight, in high-volume or performance-critical applications, the overhead of MIME type detection may need to be considered.
Code Examples
// Determine the MIME type of a file extension
const mime = require('mime-types');
const fileExtension = 'jpg';
const mimeType = mime.lookup(fileExtension);
console.log(mimeType); // Output: 'image/jpeg'
// Determine the MIME type of a file path
const mime = require('mime-types');
const filePath = '/path/to/file.pdf';
const mimeType = mime.lookup(filePath);
console.log(mimeType); // Output: 'application/pdf'
// Get the file extension from a MIME type
const mime = require('mime-types');
const mimeType = 'text/html';
const fileExtension = mime.extension(mimeType);
console.log(fileExtension); // Output: 'html'
// Check if a MIME type is valid
const mime = require('mime-types');
const mimeType = 'image/jpeg';
const isValid = mime.valid(mimeType);
console.log(isValid); // Output: true
Getting Started
To use the broofa/mime
library in your project, follow these steps:
- Install the library using npm or yarn:
npm install mime-types
- Import the library in your JavaScript file:
const mime = require('mime-types');
- Use the library's methods to determine MIME types, file extensions, and perform other related operations:
// Determine the MIME type of a file extension
const fileExtension = 'jpg';
const mimeType = mime.lookup(fileExtension);
console.log(mimeType); // Output: 'image/jpeg'
// Get the file extension from a MIME type
const mimeType = 'text/html';
const fileExtension = mime.extension(mimeType);
console.log(fileExtension); // Output: 'html'
- Refer to the library's documentation for more advanced usage and additional features.
Competitor Comparisons
The ultimate javascript content-type utility.
Pros of mime-types
- More comprehensive MIME type database with over 1000 types
- Regular updates to keep the database current
- Supports both extension-to-MIME and MIME-to-extension lookups
Cons of mime-types
- Larger package size due to extensive database
- Slightly more complex API compared to mime
Code Comparison
mime-types:
const mime = require('mime-types');
mime.lookup('json'); // 'application/json'
mime.extension('application/json'); // 'json'
mime.contentType('markdown'); // 'text/markdown; charset=utf-8'
mime:
const mime = require('mime');
mime.getType('txt'); // 'text/plain'
mime.getExtension('text/plain'); // 'txt'
mime.define({'text/x-abc': ['abc']});
Key Differences
- mime-types offers a more extensive database, while mime focuses on a smaller, core set of types
- mime-types provides bidirectional lookups (extension-to-MIME and MIME-to-extension), whereas mime primarily focuses on extension-to-MIME lookups
- mime allows for easier custom MIME type definitions
- mime-types is part of the jshttp organization, which maintains several HTTP-related modules, potentially offering better integration with other jshttp projects
Both libraries serve similar purposes, but mime-types is more comprehensive and regularly updated, while mime is lighter and simpler to use for basic MIME type lookups.
Detect the file type of a file, stream, or data
Pros of file-type
- Supports a wider range of file types, including audio, video, and archive formats
- Provides more detailed file type information, including MIME type and extensions
- Offers both synchronous and asynchronous APIs for flexibility
Cons of file-type
- Larger package size due to extensive file type support
- May have slightly slower performance for simple MIME type lookups
- Requires Node.js environment, not suitable for browser-based applications
Code Comparison
file-type:
import {fileTypeFromFile} from 'file-type';
const type = await fileTypeFromFile('path/to/file.jpg');
console.log(type); // { ext: 'jpg', mime: 'image/jpeg' }
mime:
import mime from 'mime';
const type = mime.getType('path/to/file.jpg');
console.log(type); // 'image/jpeg'
Summary
file-type is a more comprehensive solution for file type detection, offering support for a wide range of formats and detailed information. It's ideal for applications requiring in-depth file analysis. mime, on the other hand, is a lightweight option focused primarily on MIME type lookups, making it suitable for simpler use cases and browser-based applications. The choice between the two depends on the specific requirements of your project, balancing between feature richness and simplicity.
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Mime
An API for MIME type information.
[!Note]
mime@4
is nowlatest
. If you're upgrading frommime@3
, note the following:
mime@4
is API-compatible withmime@3
, withonetwo exceptions:
- Direct imports of
mime
properties no longer supportedmime.define()
cannot be called on the defaultmime
object- ESM module support is required. ESM Module FAQ.
- Requires an ES2020 or newer runtime
- Built-in Typescript types (
@types/mime
no longer needed)
Installation
npm install mime
Quick Start
For the full version (800+ MIME types, 1,000+ extensions):
import mime from 'mime';
mime.getType('txt'); // ⨠'text/plain'
mime.getExtension('text/plain'); // ⨠'txt'
Lite Version
mime/lite
is a drop-in mime
replacement, stripped of unofficial ("prs.*
", "x-*
", "vnd.*
") types:
import mime from 'mime/lite';
API
mime.getType(pathOrExtension)
Get mime type for the given file path or extension. E.g.
mime.getType('js'); // ⨠'text/javascript'
mime.getType('json'); // ⨠'application/json'
mime.getType('txt'); // ⨠'text/plain'
mime.getType('dir/text.txt'); // ⨠'text/plain'
mime.getType('dir\\text.txt'); // ⨠'text/plain'
mime.getType('.text.txt'); // ⨠'text/plain'
mime.getType('.txt'); // ⨠'text/plain'
null
is returned in cases where an extension is not detected or recognized
mime.getType('foo/txt'); // ⨠null
mime.getType('bogus_type'); // ⨠null
mime.getExtension(type)
Get file extension for the given mime type. Charset options (often included in Content-Type headers) are ignored.
mime.getExtension('text/plain'); // ⨠'txt'
mime.getExtension('application/json'); // ⨠'json'
mime.getExtension('text/html; charset=utf8'); // ⨠'html'
mime.getAllExtensions(type)
[!Note] New in
mime@4
Get all file extensions for the given mime type.
mime.getAllExtensions('image/jpeg'); // ⨠Set(3) { 'jpeg', 'jpg', 'jpe' }
Custom Mime
instances
The default mime
objects are immutable. Custom, mutable versions can be created as follows...
new Mime(type map [, type map, ...])
Create a new, custom mime instance. For example, to create a mutable version of the default mime
instance:
import { Mime } from 'mime/lite';
import standardTypes from 'mime/types/standard.js';
import otherTypes from 'mime/types/other.js';
const mime = new Mime(standardTypes, otherTypes);
Each argument is passed to the define()
method, below. For example new Mime(standardTypes, otherTypes)
is synonomous with new Mime().define(standardTypes).define(otherTypes)
mime.define(type map [, force = false])
[!Note] Only available on custom
Mime
instances
Define MIME type -> extensions.
Attempting to map a type to an already-defined extension will throw
unless the force
argument is set to true
.
mime.define({'text/x-abc': ['abc', 'abcd']});
mime.getType('abcd'); // ⨠'text/x-abc'
mime.getExtension('text/x-abc') // ⨠'abc'
Command Line
Extension -> type
$ mime scripts/jquery.js
text/javascript
Type -> extension
$ mime -r image/jpeg
jpeg
Top Related Projects
The ultimate javascript content-type utility.
Detect the file type of a file, stream, or data
Convert designs to code with AI
Introducing Visual Copilot: A new AI model to turn Figma designs to high quality code using your components.
Try Visual Copilot