app.ready()
Resolves once all plugins have finished loading without starting the server.
Syntax
app.ready(): Promise<FastifyInstance>Returns
Promise<FastifyInstance> — Resolves when the boot sequence completes.
Throws
Error— Rejected if a plugin fails during boot.
Examples
import Fastify from 'fastify';
const app = Fastify();
app.get('/cats', async () => ['kitty']);
await app.ready();
// The route tree and plugins are fully loaded here.
console.log(app.printRoutes());
Notes
Useful for serverless adapters and tests where you need the app fully
booted but do not want to bind a port. inject() also calls ready()
internally.