wrangler

What is wrangler?

The wrangler npm package is a command-line tool for building, deploying, and managing Cloudflare Workers projects. It simplifies the process of working with Cloudflare's serverless platform, allowing developers to focus on writing code rather than managing infrastructure.

What are wrangler's main functionalities?

Creating a new Cloudflare Workers project

This command initializes a new Cloudflare Workers project in a directory named 'my-worker'. It sets up the necessary configuration files and project structure.

npx wrangler generate my-worker

Publishing a Cloudflare Worker

This command deploys your Cloudflare Worker to the Cloudflare network. It reads the configuration from the wrangler.toml file and uploads your code to Cloudflare.

npx wrangler publish

Previewing a Cloudflare Worker

This command allows you to preview your Cloudflare Worker in a browser before deploying it. It provides a temporary URL where you can test your worker.

npx wrangler preview

Managing environment variables

This command allows you to securely store environment variables for your Cloudflare Worker. You will be prompted to enter the value for the secret, which will then be encrypted and stored.

npx wrangler secret put MY_SECRET

Other packages similar to wrangler

serverless

The Serverless Framework is a popular open-source framework for building and deploying serverless applications across various cloud providers, including AWS, Azure, and Google Cloud. It offers a broader range of integrations and features compared to wrangler, which is specific to Cloudflare Workers.

architect

Architect (or @architect) is an open-source framework for building and deploying serverless applications on AWS. It provides a simple and declarative way to define serverless infrastructure and focuses on developer productivity. Unlike wrangler, which is Cloudflare-specific, Architect is designed for AWS.

claudia

Claudia.js is a tool for deploying Node.js projects to AWS Lambda and API Gateway. It automates many of the deployment steps and simplifies the process of creating and managing serverless applications on AWS. Claudia.js is more AWS-centric, whereas wrangler is tailored for Cloudflare Workers.

README

Mime

A comprehensive, compact MIME type module.

Version 2 Notes

Version 2 is a breaking change from 1.x as the semver implies. Specifically:

• lookup() renamed to getType()
• extension() renamed to getExtension()
• charset() and load() methods have been removed

If you prefer the legacy version of this module please npm install mime@^1. Version 1 docs may be found here.

Install

NPM

npm install mime

Browser

It is recommended that you use a bundler such as webpack or browserify to package your code. However, browser-ready versions are available via wzrd.in. E.g. For the full version:

<script src="https://wzrd.in/standalone/mime@latest"></script>
<script>
mime.getType(...); // etc.
</script>

Or, for the mime/lite version:

<script src="https://wzrd.in/standalone/mime%2flite@latest"></script>
<script>
mimelite.getType(...); // (Note `mimelite` here)
</script>

Quick Start

For the full version (800+ MIME types, 1,000+ extensions):

const mime = require('mime');

mime.getType('txt');                    // ⇨ 'text/plain'
mime.getExtension('text/plain');        // ⇨ 'txt'

See Mime API below for API details.

Lite Version

There is also a "lite" version of this module that omits vendor-specific (*/vnd.*) and experimental (*/x-*) types. It weighs in at ~2.5KB, compared to 8KB for the full version. To load the lite version:

const mime = require('mime/lite');

Mime .vs. mime-types .vs. mime-db modules

For those of you wondering about the difference between these [popular] NPM modules, here's a brief rundown ...

mime-db is "the source of truth" for MIME type information. It is not an API. Rather, it is a canonical dataset of mime type definitions pulled from IANA, Apache, NGINX, and custom mappings submitted by the Node.js community.

mime-types is a thin wrapper around mime-db that provides an API drop-in compatible(ish) with mime @ < v1.3.6 API.

mime is, as of v2, a self-contained module bundled with a pre-optimized version of the mime-db dataset. It provides a simplified API with the following characteristics:

• Intelligently resolved type conflicts (See mime-score for details)
• Method naming consistent with industry best-practices
• Compact footprint. E.g. The minified+compressed sizes of the various modules:

Module	Size
mime-db	18 KB
mime-types	same as mime-db
mime	8 KB
mime/lite	2 KB

Mime API

Both require('mime') and require('mime/lite') return instances of the MIME class, documented below.

Note: Inputs to this API are case-insensitive. Outputs (returned values) will be lowercase.

new Mime(typeMap, ... more maps)

Most users of this module will not need to create Mime instances directly. However if you would like to create custom mappings, you may do so as follows ...

// Require Mime class
const Mime = require('mime/Mime');

// Define mime type -> extensions map
const typeMap = {
  'text/abc': ['abc', 'alpha', 'bet'],
  'text/def': ['leppard']
};

// Create and use Mime instance
const myMime = new Mime(typeMap);
myMime.getType('abc');            // ⇨ 'text/abc'
myMime.getExtension('text/def');  // ⇨ 'leppard'

If more than one map argument is provided, each map is define()ed (see below), in order.

mime.getType(pathOrExtension)

Get mime type for the given path or extension. E.g.

mime.getType('js');             // ⇨ 'application/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 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.define(typeMap[, force = false])

Define [more] type mappings.

typeMap is a map of type -> extensions, as documented in new Mime, above.

By default this method will throw an error if you try to map a type to an extension that is already assigned to another type. Passing true for the force argument will suppress this behavior (overriding any previous mapping).

mime.define({'text/x-abc': ['abc', 'abcd']});

mime.getType('abcd');            // ⇨ 'text/x-abc'
mime.getExtension('text/x-abc')  // ⇨ 'abc'

Command Line

mime [path_or_extension]

E.g.

> mime scripts/jquery.js
application/javascript

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