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Building APIs with Deno: Modern JavaScript Runtime

Administrator admin API JavaScript Intermediate Jan 09, 2026 12:41 AM 5 views

What is Deno?

Deno is a secure runtime for JavaScript and TypeScript, built on V8 and Rust, with built-in TypeScript support.

Basic Deno Server

import { serve } from "https://deno.land/std@0.168.0/http/server.ts";

serve(async (req) => {
    const url = new URL(req.url);
    
    if (url.pathname === "/api/users" && req.method === "GET") {
        const users = [
            { id: 1, name: "John", email: "john@example.com" }
        ];
        return new Response(JSON.stringify(users), {
            headers: { "Content-Type": "application/json" }
        });
    }
    
    return new Response("Not Found", { status: 404 });
}, { port: 8000 });

Running Deno

# Run server
deno run --allow-net server.ts

Best Practices

  • Use TypeScript by default
  • Import from URLs directly
  • Use built-in security features
  • Handle errors properly
  • Use standard library modules

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