Sign Up for Free

RunKit +

Try any Node.js package right in your browser

This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 400,000 packages pre-installed, including render-sender with all npm packages installed. Try it out:

var renderSender = require("render-sender")

This service is provided by RunKit and is not affiliated with npm, Inc or the package authors.

render-sender v1.6.0

On-demand image resizer/minfier/cacher


A small module that can resize, minify and cache images using:

  • imageMagick
  • imagemin
  • send
  • ffmpeg


npm install render-sender


var rs = require('render-sender')({ cache : '/opt/cache', maxAge : '30 d' });

 expressish app declared here


app.get('/images/:file.jpg', function (req, res) {
        req : req
        , res : res
        , path : '/opt/images/' + req.params.file + '.jpg'
        , width : 100
        , height : 100
        , format : 'jpg'
    }, function (err) {
        if (err) {


rs = require('render-sender')(opts);

  • opts - [object] an object containing settings for the render-sender instance
    • cache - [string] the path where cached images should be saved
    • maxAge - [string] the maxAge used with the send module


Render the requested changes to an image and send the response to an http response object.

  • opts - [object] an object containing the details of what is currently being requested
    • req - [object] an http server request object
    • res - [object] an http server response object
    • path - [string] the path to an image file to be processed
    • width - [numeric] the requested resize width of the image
    • height - [numeric] the requested resize height of the image
    • format - [string] the output format requested (jpg,png)
    • stream - [stream/function] a readable stream of binary image data
      • if stream is a function it should return a readable stream when called
      • a file name is still required as part of path for caching


Just render the requested image and save it to the cache dir.

  • opts - same as listed above except req and res



RunKit is a free, in-browser JavaScript dev environment for prototyping Node.js code, with every npm package installed. Sign up to share your code.
Sign Up for Free