Extending studio

jsreport extensions can contain also UI part and inject additional functionality to the jsreprot studio. This is very common in the most of the standard extensions and the studio API is fully open also to the custom extensions.

Get started

  1. clone or download jsreport-extension-starter-kit
  2. npm install
  3. npm start

Source transpilation

Extensions including the studio code, needs to contain directory /studio in it's root and file main.js inside. The content of main.js file is then during the jsreport startup copied with all other extensions into a single bundle and evaluated during the studio initialization.

It is the responsibility of the extension to do the javascript transpilation and bundling. The main.js file should contain the final code to be run in the browser. Fortunately there is package @jsreport/studio-dev which automates the bundling and transpilation for you. This is what you can find also in jsreport-extension-starter-kit, where the actual sources for the extension are in the file main_dev.js which are compiled into main.js through the prepublish script.

Extension source

Interaction with jsreport studio API is done through Studio object which can be imported as ES6 module from jsreport-studio.

import Studio from 'jsreport-studio'

Studio.readyListeners.push(async () => {
  Studio.openModal(() => <span>Hello from the custom extension</span>)

The Studio object represents a facade around whole studio API. It contains functions for opening new tabs, adding custom entity types or hooks for listening to events. The list of Studio members can be found separately in Studio API reference.


jsreport studio is based on the technology stack formed mainly around reactjs, redux and webpack. You don't need to be an expert on these technologies however it is recommended you get at least a bit familiar with it before developing jsreport custom extension.


The extension build automatically links the common libraries from jsreport studio core and keeps the final main.js size minimal. You can for example import react module without installing it and it will just work

import React, { Component } from 'react'

export default class MyComponent extends Component {

Currently you can import in this way the following npm modules react, react-dom, react-list, superagent, bluebird, filesaver.js-npm, socket.io-client

If wish to use other library, you can simply install it and import it. It will be bundled into the final main.js during the extension build.


As mentioned previously, the most of the standard extensions are including also the UI part. It is quite often very simple and can serve well as an example. See the existing jsreport extensions' code here and pick up the samples you need.


The Studio API reference is availible here.

jsreport version