Node.JS

Node.js is runtime environment that allows you to run JavaScript on the server side.

• Node.js built → It is built on Chrome's V8 JavaScript engine.
• Node.js → Executing JavaScript code outside of a web browser.

JavaScript Engines

• V8 Engine → Google → Node.js and Google Chrome
• Spider Monkey Engine → Mozilla → Firefox
• WebKit Engine → Apple → Safari

JavaScript Runtime Environments

1. Node.js
2. Deno → Build by node.js org
3. Bun → Build by node.js org

Bun

Bun gets closer to 99.99% Node.js API compatibility. Today, popular frameworks like Next.js, Express, and millions of npm packages intended for Node just work with Bun.

• Latest & Very Fast
• Crash some time in old code base
• Bun a drop-in replacement for Node.js
• drop-in replacement → the code written in node.js, I can do it in bun because Node.js and Bun signature same.

✅If you have written code for Bun then that code will not run in Node.js but all the code of Node.js will run in bun.

Features of Node.js