Middleware Pipeline

Froot utilizes an async onion-pipeline model for middleware execution. Middleware can intercept requests, inspect headers, and perform post-processing on responses.

Writing Custom Middleware

import type { MiddlewareHandler } from 'frootjs';

export const responseTimer: MiddlewareHandler = async (c, next) => {
  const start = performance.now();
  await next();
  const elapsed = (performance.now() - start).toFixed(2);
  c.header('X-Response-Time', `${elapsed}ms`);
};

app.use(responseTimer);

Built-In Middlewares

• cors(options): Cross-Origin Resource Sharing headers and preflight handling.
• logger(): Fast request logging with status code colors.
• secureHeaders(): CSP, HSTS, X-Frame-Options, and nosniff protection.