Carlo provides Node applications with the rich rendering capabilities powered by the Google Chrome browser. It uses Puppeteer project to communicate with the locally installed browser instance, provides remote call infrastructure for communication between Node and the browser.
With Carlo, you can create hybrid applications that use Web stack for rendering and Node for capabilities:
- For Node applications, you can visualize dynamic state of your Node app using web rendering stack
- For Web applications, you can expose additional system capabilities accessible from Node
- Bundle your application into a single executable using pkg.
- Carlo locates Google Chrome installed locally
- Launches it and establishes connection to Chrome over the process pipe
- Exposes high level API for rendering in Chrome in Node environment
- Carlo is based on the Puppeteer project
To use Carlo in your project, run:
npm i carlo
# or "yarn add carlo"Note: Carlo requires at least Node v7.6.0.
Example - Visualize local environment:
Save file as example.js
const carlo = require('carlo');
(async () => {
const app = await carlo.launch();
app.serveFolder(__dirname);
await app.exposeFunction('env', _ => process.env);
await app.load('example.html');
})();Save file as example.html
<script>
async function run() {
const data = await env();
for (const type in data) {
const div = document.createElement('div');
div.textContent = `${type}: ${data[type]}`;
document.body.appendChild(div);
}
}
</script>
<body onload="run()">Execute script on the command line
node example.jsCheck out more examples with richer UI and RPC-based communication between the Web and Node components under the examples folder.
Check out contributing guide to get an overview of Carlo development.
Q: What was the motivation behind this project when we already have Electron and NW.js? How this differs from these platforms, how it helps to achieve something that's not possible/harder with these two?
- One of the motivations is to demonstrate how browser installed locally can be used with Node out of the box.
- Unlike with Electron, Node v8 and Chrome v8 engines are decoupled in Carlo, providing a maintainable model with the ability of the independent updates of the underlying components. Carlo is less about branding and is more about productivity + giving the control over bundling to the user.
One can use the pkg project to package their Node app as a Desktop app. Carlo does not provide the branding configurability such as application icon or customizable menus, it focuses on the productivity and Web/Node interoperability instead. Check out the systeminfo example and call pkg package.json in it to see how it works.
Carlo prints error message when it can't locate Chrome.
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