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In 2025, developers are constantly seeking better tools that improve performance, simplify workflows, and reduce configuration overhead. That’s where Bun js: the blazing-fast Node.js alternative you need to try in 2025 comes in. It’s not just hype—Bun.js is changing the JavaScript landscape with its all-in-one approach. Whether you’re building APIs, working with TypeScript, or just tired of slow npm install commands, Bun might be the upgrade you've been waiting for.
Let’s dive into what Bun.js is, why it’s gaining popularity, and how you can get started step-by-step.
Bun.js is a modern JavaScript runtime built from scratch using Zig, a performance-focused programming language. It combines multiple tools into one:
JavaScript/TypeScript Runtime (like Node.js)
Package Manager (like npm/yarn/pnpm)
Bundler (like Webpack/Vite/Parcel)
Test Runner (like Jest)
10x faster install speeds than npm
Native TypeScript & ES Module support
Zero-config development server
Built-in test framework
Instant hot reload during development
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| Feature | Bun.js | Node.js |
| Runtime | Built in Zig | Built in C++ |
| Package Manager | bun install (super fast) | npm, yarn, or pnpm |
| TypeScript Support | Native | Requires ts-node or compiler |
| Test Runner | Built-in | Needs Jest/Mocha |
| ESM Support | Default | Partial/optional |
| Performance | Faster cold start and runtime | Slower, more memory-intensive |
Setting up Bun.js is super simple:
curl -fsSL https://bun.sh/install | bash
This installs the bun binary on your system.
💡 Note for Windows Users: You can use Bun via WSL or wait for native Windows support (currently in development).
Create a new project using Bun’s built-in scaffolding:
bun init
It will prompt you to:
Name your project
Choose TypeScript or JavaScript
Automatically set up a bunfig.toml config
Just like npm or yarn, you can install packages:
bun install axios
It’s blazingly fast, thanks to Bun’s internal caching and parallel processing.
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Bun comes with a Jest-like test runner built in:
math.test.ts:import { expect, test } from 'bun:test'
test('adds two numbers', () => {
expect(1 + 2).toBe(3)
})
Run all tests:
bun test
No extra setup required. Everything is ready to go.
Here’s how to start an HTTP server using Bun:
// index.ts
const server = Bun.serve({
port: 3000,
fetch(req) {
return new Response("Hello from Bun!");
},
});
console.log(`Listening on http://localhost:${server.port}`);
Run it using:
bun index.ts
Boom! Your server is live in milliseconds.
While Bun is powerful, here are a few current limitations:
Not all Node.js APIs are fully supported (e.g., fs, http2).
Some npm packages might not work without shims.
Windows native support is still in progress.
✅ However, the Bun team is actively working on improving compatibility and developer tooling.
Bun.js is perfect for:
Developers building TypeScript-first projects
Creators of fullstack apps using frameworks like Next.js or Astro
Backend developers needing lightweight HTTP servers
Anyone looking to reduce build time and dependency bloat
Official Website: https://bun.sh
GitHub Repo: https://github.com/oven-sh/bun
Bun on Twitter/X: @bun_js
Bun is a modern JavaScript runtime like Node.js, but it's built from the ground up to be faster and more efficient. It includes a bundler, transpiler, and package manager all in one—reducing dependency on external tools like Webpack, Babel, and npm.
Bun is built with Zig, a systems programming language focused on performance and safety, while Node.js is based on C++. Bun is faster at executing JavaScript, cold starts, and file reads. It also includes features like native TypeScript support and a built-in package manager.
Bun supports many of the Node.js APIs, but it’s not 100% compatible yet. Most modern libraries work fine, but you might run into issues with packages that rely on Node-specific internals. Testing is key before full migration.
Yes, but with caution. While Bun has matured rapidly, it's still catching up in terms of ecosystem support. Many developers are already using it for side projects or internal tools, but for mission-critical production apps, thorough testing is essential.
Yes! Bun can run .ts and .tsx files without requiring a separate compilation step. This simplifies development and reduces build times dramatically.
Bun is significantly faster in tasks like package installation, script execution, and file serving. In some benchmarks, it’s 10x faster than Node.js for specific use cases like server-side rendering or CLI tools.
Yes, Bun is open-source and actively developed. You can contribute or check out the source code on GitHub.
You can install Bun using a single command:
curl -fsSL https://bun.sh/install | bash
After installation, use bun just like you would use node, npm, or yarn.
Yes, Bun includes its own package manager (bun install) which is much faster than both npm and yarn. It can handle node_modules, install packages, and run scripts—all without external tooling.
Visit the official website at https://bun.sh or follow the GitHub repository for updates, documentation, and community discussions.
Bun.js: The blazing-fast Node.js alternative you need to try in 2025 is more than just a trend. It's a complete rethinking of how JavaScript development should work—fast, simple, and unified.
Whether you're tired of npm install delays, want native TypeScript support, or just want to try something new, Bun.js deserves a spot in your toolkit. Give it a try—you might never go back.
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