cloud development environment

Express online coding platform

Build Express APIs in the cloud with Node.js preinstalled.

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about Express

Express in the cloud, ready in under a minute.

Express is a minimalist web framework for Node.js that simplifies building HTTP servers, APIs, and web apps. It handles routing, middleware, and request/response processing without enforcing an application structure, so you pick what you need. Open a RunCode workspace and Node.js with npm is ready in under a minute.

Open a Express workspace →
app.js

What Express provides

Express sits on top of Node's HTTP module and adds routing, middleware chains, and template rendering. Middleware functions process requests in sequence, so you compose behavior from small, focused pieces: JSON body parsing, authentication, logging, CORS headers, and error handling. Routing maps HTTP methods and URL patterns to handler functions. Template engine support lets you render HTML from data without managing string concatenation. The npm ecosystem has thousands of compatible middleware packages that drop into an Express app.

  • Flexible routing by HTTP method and URL path
  • Middleware pipeline for composing request handling
  • Support for multiple template engines (EJS, Pug, Handlebars)
  • Built-in error handling hooks
  • Compatible with the full npm middleware ecosystem

Using Express on RunCode

  1. Create a workspace and select the Node.js runtime.
  2. Install Express: `npm install express`.
  3. Create `app.js` and define your routes.
  4. Start the server: `node app.js`.
  5. Test routes in the browser or with curl.
your cloud development solution

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