request

What is request?

The 'request' npm package is a simple, yet powerful HTTP client that supports multiple features such as making HTTP calls, handling responses, streaming data, and more. It is designed to be the simplest way possible to make http calls and supports HTTPS and follows redirects by default.

What are request's main functionalities?

Simple HTTP GET requests

This code performs a simple HTTP GET request to Google's homepage and logs the error, response status code, and the response body.

const request = require('request');
request('http://www.google.com', function (error, response, body) {
  console.log('error:', error);
  console.log('statusCode:', response && response.statusCode);
  console.log('body:', body);
});

Streaming data

This code demonstrates how to stream data from an HTTP request directly to a file, which can be useful for downloading files or handling large amounts of data.

const request = require('request');
const fs = require('fs');
const stream = fs.createWriteStream('file.txt');
request('http://www.google.com').pipe(stream);

Custom HTTP headers

This code shows how to send a custom HTTP header (in this case, the User-Agent header) with a request. This is often required when using certain APIs, like GitHub's.

const request = require('request');
const options = {
  url: 'https://api.github.com/repos/request/request',
  headers: {
    'User-Agent': 'request'
  }
};
function callback(error, response, body) {
  if (!error && response.statusCode == 200) {
    const info = JSON.parse(body);
    console.log(info);
  }
}
request(options, callback);

Handling POST requests

This code snippet demonstrates how to send a POST request with form data, including how to upload a file as part of that form data.

const request = require('request');
const options = {
  method: 'POST',
  url: 'http://service.com/upload',
  headers: {
    'Content-Type': 'multipart/form-data'
  },
  formData: {
    key: 'value',
    file: fs.createReadStream('file.txt')
  }
};
request(options, function (error, response, body) {
  if (error) throw new Error(error);
  console.log(body);
});

Other packages similar to request

axios

Axios is a promise-based HTTP client for the browser and Node.js. It provides a simple API for making HTTP requests and is often used as an alternative to 'request' due to its promise support and interceptors for request/response manipulation.

got

Got is a human-friendly and powerful HTTP request library. It is designed to be a simpler and more performant alternative to 'request', with features like streams support, promise API, and better error handling.

node-fetch

Node-fetch is a light-weight module that brings the Fetch API to Node.js. It is an alternative to 'request' that provides a simpler, promise-based API for making HTTP requests, similar to what is available in modern web browsers.

superagent

Superagent is a small progressive client-side HTTP request library, and Node.js module with the same API, sporting many high-level HTTP client features. It compares to 'request' by offering a fluent API and being lightweight.

README

Request -- Simplified HTTP request method

Install

  npm install request

Or from source:

  git clone git://github.com/mikeal/request.git 
  cd request
  npm link .

Super simple to use

Request is designed to be the simplest way possible to make http calls. It support HTTPS and follows redirects by default.

  var request = require('request');
  request({uri:'http://www.google.com'}, function (error, response, body) {
    if (!error && response.statusCode == 200) {
      sys.puts(body) // Print the google web page.
    }
  })

request(options, callback)

The first argument is an options object. The only required option is uri, all others are optional.

• uri || url - fully qualified uri or a parsed url object from url.parse()
• method - http method, defaults to GET
• headers - http headers, defaults to {}
• body - entity body for POST and PUT requests. Must be buffer or string.
• json - sets body but to JSON representation of value and adds Content-type: application/json header.
• multipart - (experimental) array of objects which contains their own headers and body attribute. Sends multipart/related request. See example below.
• followRedirect - follow HTTP 3xx responses as redirects. defaults to true.
• maxRedirects - the maximum number of redirects to follow, defaults to 10.
• onResponse - If true the callback will be fired on the "response" event instead of "end". If a function it will be called on "response" and not effect the regular semantics of the main callback on "end".
• encoding - Encoding to be used on response.setEncoding when buffering the response data.
• pool - A hash object containing the agents for these requests. If omitted this request will use the global pool which is set to node's default maxSockets.
• pool.maxSockets - Integer containing the maximum amount of sockets in the pool.

The callback argument gets 3 arguments. The first is an error when applicable (usually from the http.Client option not the http.ClientRequest object). The second in an http.ClientResponse object. The third is the response body buffer.

Examples:

  var request = require('request');
  var rand = Math.floor(Math.random()*100000000).toString();
  request(
    { method: 'PUT'
    , uri: 'http://mikeal.couchone.com/testjs/' + rand
    , multipart: 
      [ { 'content-type': 'application/json'
        ,  body: JSON.stringify({foo: 'bar', _attachments: {'message.txt': {follows: true, length: 18, 'content_type': 'text/plain' }}})
        }
      , { body: 'I am an attachment' }
      ] 
    }
  , function (error, response, body) {
      if(response.statusCode == 201){
        console.log('document saved as: http://mikeal.couchone.com/testjs/'+ rand);
      } else {
        console.log('error: '+ response.statusCode);
        console.log(body);
      }
    }
  )

Notice for 2.0

You should no longer recycle mutations in the options object. Because node 0.4.0 has an internal pooling mechanism the preferred way of sharing a connection is using agents which request simplifies with it's new pool API. Therefor options.client and some other mutations have been deprecated.

requestBodyStream and responseBodyStream are also deprecated in favor of a more standard pipe interface documented below.

stream.pipe(request(options)) and request(options).pipe(stream)

Previous versions of request had no return value and only accepted callbacks and streams for pumping in the options object.

Node has solidified it's Stream interface and request 2.0 is now compliant with that interface.

The return value of request() is now a Request object, which is a valid stream.

As a writable stream it accepts the body of an HTTP request. As a readable stream it emits the data events for the response.

  var r = request(
    { url: "http://mysite.com/image.png"
    , method: 'PUT'
    , headers: {'content-type': 'image/png'}
    }
  )
  fs.createReadStream('image.png').pipe(r)
  r.pipe(fs.createWriteStream('pushlog.txt'))

Convenience methods

request.defaults(options)

This method returns a wrapper around the normal request API that defaults to whatever options you pass in to it.

request.put

Same as request() but defaults to method: "PUT".

request.post

Same as request() but defaults to method: "POST".

request.head

Same as request() but defaults to method: "HEAD".

request.get

Alias to normal request method for uniformity.