Streaming pipeline for requesting, modifying and uploading an image.

pipeline.js

'use strict'

var http = require('http')
var request = require('request')
var gm = require('gm')
var fs = require('fs')
var FormData = require('form-data')

let r1 = request('https://upload.wikimedia.org/wikipedia/commons/e/eb/Ash_Tree_-_geograph.org.uk_-_590710.jpg')

let imageMagick = gm.subClass({imageMagick: true})

let i1 = imageMagick(r1)
i1.resize(200)
let s1 = i1.stream()

let i2 = imageMagick(s1)
i2.monochrome()
let s2 = i2.stream()

let form = new FormData()
form.append('modified', 'true')
form.append('file', s2, 'test.jpg')

let r2 = http.request({
  method: 'post',
  host: 'localhost',
  port: 3008,
  path: '/upload',
  headers: form.getHeaders()
})

r2.on('response', (res) => {
  console.log('STATUS', res.statusCode);
})

r2.on('error', (e) => {
  console.log('ERROR', e);
})

form.pipe(r2)

Example on how to request a remote image, run it through image magick for modifications and then post a multipart request to another service. Streaming the whole way.