What is JavaScript?
The programming language that runs in every web browser — and increasingly on the server (Node.js, Deno, Bun) and at the edge.
JavaScript started as a scripting language for browsers (1995) and is now one of the most-used programming languages overall. It powers browsers, server-side (Node.js, Bun, Deno), edge functions (Vercel Edge, Cloudflare Workers), even desktop apps (Electron). Modern JS includes ES modules, async/await, optional chaining, and many features ported over from TypeScript. React, Vue, and Svelte are the dominant frontend frameworks. Next.js is the dominant React meta-framework. InBuild's exported code is JavaScript-and-TypeScript (mostly TS for type safety).