Fastro v1.0.0: High Performance by Design

Fastro Team 2026-02-01

We are thrilled to announce the release of Fastro v1.0.0. This version represents a significant milestone in our quest to build the fastest, most developer-friendly web framework for Deno.

Starting with v1.0.0, Fastro shifts to a robust class-based architecture while maintaining its ultra-lean core. This version is the result of a total revamp and a unique collaboration with Gemini AI, ensuring every line of code is optimized for both humans and machines.

Performance: ~77,600 Requests/sec

The primary goal of Fastro is to provide a high-level API without the "framework tax." Our latest benchmarks show that Fastro maintains over 94.8% of native Deno.serve performance, reaching 77,654 requests per second with an average latency of only 1.21ms. We achieved this through several key technical decisions:

1. Zero-Dependency Core & 100% Coverage

Fastro is built strictly on Deno standards. By avoiding a heavy tree of external dependencies, we keep the startup time near-instant and the runtime overhead minimal. This release also marks a milestone in stability: 100% test coverage across the entire core.

2. Intelligent LRU Caching

Routing is often the bottleneck in web frameworks. Fastro uses an intelligent Least Recently Used (LRU) cache for route matching. Once a URL is matched to a route pattern, the Result is cached. Subsquent requests to the same path skip expensive regex executions entirely.

3. Lazy Parsing

We don't parse what you don't use. Objects like ctx.url and ctx.query are lazy-loaded getters. If your handler doesn't touch the query parameters, Fastro never spends cycles parsing the search string.

Developer Experience: Class-Based API

In response to community feedback, v1.0.0 introduces a familiar class-based constructor:

import Fastro from "https://deno.land/x/fastro/mod.ts";

const app = new Fastro();

app.get("/", () => "Hello World");

await app.serve();

This pattern provides better IDE discoverability and allows for multiple isolated server instances within the same process.

Built for Scale

Fastro isn't just for "Hello World" apps. We've included advanced features for large-scale applications:

Modular Routing: Group routes using createRouter() and mount them as middleware.
Automatic Module Loading: Turn your folder structure into an application automatically with autoRegisterModules.
Flexible Context: A unified ctx object that flows through middleware, allowing for clean state management.

What's Next?

We are just getting started. v1.0.0 is our stable foundation. In the coming months, we'll be focusing on expanding our built-in middleware ecosystem and improving our documentation and tutorials.

Thank you to everyone who contributed to the journey!