Skip to main content

Server nodes

Creating and starting the Express application itself. Every flow with any server/routing/middleware node needs exactly one express.init.

Express App — express.init​

Creates the Express application instance.

  • Inputs: none
  • Outputs: out — "App"
  • Config fields: none
  • Constraints: exactly one per flow — compiling rejects a flow with two.

Always generates the same two lines, regardless of config:

const express = require("express");

const app = express();

Listen — express.listen​

Starts the HTTP server on a port.

  • Inputs: in — "App"
  • Outputs: none
  • Config fields:
KeyTypeDefaultNotes
portnumber3000Falls back to 3000 if not a finite number.

This is always emitted last in the generated file, no matter how it's wired — every other node type's setup code is ordered to land before it.

app.listen(3000, () => {
  console.log("Server running on port 3000");
});