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Hello World

The canonical minimal flow — the shape every other example builds on.

Nodes involved: express.init, express.middleware.jsonParser, express.route, logic.handlerFunction, handler.sendJson, express.listen.

A single GET /hello route answers with a static JSON body. No custom code, no variables, no dependencies — just the node types every generated server starts from.

Generated server.js​

const express = require("express");

const app = express();

function handler(req, res, next) {
  res.status(200).json({ message: "Hello World" });
}

app.use(express.json());

app.get("/hello", handler);

app.listen(3001, () => {
  console.log("Server running on port 3001");
});

Run it​

npx visual-node examples/01-hello-world

Open http://localhost:4000, hit Compile, then Run Server to spawn it — or just read the committed server.js above, which is exactly what compiling this flow produces.

curl http://localhost:3001/hello
# {"message":"Hello World"}