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Begin — logic.begin

Runs once when this file is loaded, before any request comes in — the visual equivalent of top-of-file setup code.

  • Inputs: none (always a root of its own exec chain)
  • Outputs: out (exec) — "Then"
  • Config fields: none
  • Constraints: at most one per flow; an unwired Begin is a harmless no-op, not an error.

Category is deliberately Logic, not Server — a pure-logic helper file (functions and exports only, no routes) can use a Begin node for setup without being forced to also add an unrelated express.init.

let counter = 0;
counter = 1;

const DIR = "/srv/app";

app.get("/hello", (req, res) => {
  // ...
});

If the chain wired to Begin needs await, it's automatically wrapped in a fire-and-forget async IIFE — there's no "Async" checkbox on Begin itself:

(async () => {
  await Promise.resolve();
})();