⚡ What is Bun?
Bun — is a modern JavaScript/TypeScript runtime (like Node.js or Deno) written in the language Zig with a focus on speed, low overhead, and compatibility with the Node ecosystem.
Key points:
🔥 Very fast launch and installation of packages.
🧰 Built-in tools: package manager, tests, bundler.
🔌 Compatibility with most npm packages and Node API.
🛠 Out-of-the-box tools
In Node.js, it is customary to configure the ecosystem from a variety of utilities. In Bun, many of them are already built in — this saves design time and reduces the number of dependencies.
Bun Tool | What it does | Equivalent in Node.js |
|---|---|---|
| Lightning-fast dependency installation | npm / yarn / pnpm |
| Running scripts from |
|
| Built-in test runner | jest / vitest / mocha |
| Quick frontend/backend bundle | webpack / esbuild / rollup |
🏎 Why startups choose Bun
1) Development speed
It takes seconds to initialize a project and install hundreds of packages. This makes the "idea → MVP → feedback" cycle noticeably faster.
2) Less DevOps complexity
One runtime covers the package manager, tests, and bundler. Fewer points of failure, simpler CI and containers.
3) TypeScript without configuration
TS support out of the box — you can write in TypeScript without a separate tsconfig and manual assembly.
4) Resource savings
Quick start and more careful use of CPU/memory reduce infrastructure costs — critical for the early stage.
🔄 What about Node.js?
Node.js remains a mature standard with a huge community and the widest compatibility. For complex long-lived systems, Node.js is still a reliable choice. But when you need to quickly test a hypothesis and get out to users, Bun often wins due to its speed and simplicity.
📈 Where Bun is moving next
Full compatibility with Node API and npm modularity.
Improvements for serverless/edge platforms.
An even faster bundler and test runner.
Growth of the plugin and tooling ecosystem around Bun.
Bottom line: if you're building an MVP/startup and value speed, start with Bun. If the project is huge and requires the most predictable ecosystem, assess the risks of migration and, possibly, leave Node.js, gradually checking Bun on smaller services.
📚 Do you want to delve into the topic?
In the attachment Code you will find detailed lessons on various topics, step-by-step exercises, error analysis and convenient practice right on your phone or browser.
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What will you choose for the next MVP — Bun or Node.js?
Write in the comments why. It is interesting to collect arguments from real practice.