ExpressAPI

     

ExpressAPI is a small, simple, and type-safe web framework for Deno, built on Web Standards. Clean abstractions, elegant APIs, and almost no dependencies.

Typed end to end, not only on the server.

import { HttpServer } from "jsr:@webtools/expressapi";

export const server = new HttpServer()
	.get("/", (_req, res) => res.json({ message: "Hello!" }))
	.get("/users/:id", (req, res) => res.json({ id: req.params.id }));

export type AppRouter = typeof server;

server.listen(5050);

import type { AppRouter } from "./server.ts";
import { HttpClient } from "jsr:@webtools/expressapi";

const client = new HttpClient<AppRouter>({ baseUrl: "http://localhost:5050" });
const user = await client.get("/users/:id", { params: { id: "42" } });
//    ^ { id: string }

Quick Start

deno add jsr:@webtools/expressapi

Features

• End-to-end types - Export typeof server, get a fully typed HttpClient. No codegen, no contract file.
• Clean abstractions - HttpServer, Router, Middleware, HttpClient. Each has one job.
• Elegant APIs - Express-shaped, chainable, and familiar. Params inferred from the URL string.
• Typed middleware - Context accumulates in req.data. Wrong order fails at compile time.
• Built-in validation - Schemas narrow body, query, and params with no extra package.
• Few dependencies - Small surface, easy to audit, built on native Deno Web APIs.

Documentation

The documentation is available on expressapi-showcase.8borane8.deno.net.

License

Distributed under the MIT License. See LICENCE for more information.