Fast JavaScript runtime and package manager
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Tracked since2025
0 reviews trackedThe Bottom Line
Entry price
Free, no paid tier
Biggest pro
Extremely fast runtime
Biggest con
Still maturing (some Node APIs missing)
TL;DR - Bun
- Bun is an all-in-one JavaScript runtime and toolkit designed for speed
- It provides a bundler, test runner, and package manager that's dramatically faster than Node
- Free and open-source
Pricing: Free forever
Best for: Individuals & startups
What is Bun?
Bun is a JavaScript runtime built for speed. Node.js alternative that runs JavaScript and TypeScript faster, with built-in bundling, testing, and package management-one tool instead of npm, webpack, and jest.
The performance improvements are measurable, not marginal. Server-side code runs faster. Development workflows complete quicker. Compatibility with Node.js code means migration is often straightforward.
Developers frustrated with JavaScript tooling complexity and Node.js performance find Bun provides dramatic improvements in both areas.
Available on: Linux, macOS, Windows
Pros & Cons
Pros
- Extremely fast runtime
- Drop-in Node replacement
- Built-in bundler and test runner
- Native TypeScript support
- All-in-one toolchain
Cons
- Still maturing (some Node APIs missing)
- Windows support limited
- Less battle-tested
- Edge cases may break
- Smaller community
Key Features
Fast JavaScript runtimeBuilt-in bundlerPackage managerTest runnerTypeScript supportNode.js compatible
Pricing Plans
Pricing checked Jul 12, 2026
Free
Free
- MIT License
- Open source
- JavaScript runtime
- All-in-one toolkit
- npm compatible
Reviews
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Bun FAQ
How does Bun improve JavaScript development workflows?
Bun significantly speeds up JavaScript development workflows by offering a faster runtime and integrating tools like a bundler, test runner, and package manager into a single platform. This consolidation means developers can use one tool instead of managing separate ones like npm, webpack, and Jest.
Which teams benefit most from adopting Bun?
Teams that are frustrated with the complexity of JavaScript tooling and seeking performance improvements for their server-side code will find Bun particularly beneficial. It streamlines development by offering an all-in-one toolchain for running JavaScript and TypeScript.
How does Bun compare to Deno?
Bun differentiates itself from Deno by aiming to be a drop-in replacement for Node.js, offering compatibility with existing Node.js code. It integrates bundling, testing, and package management into a single, fast runtime, whereas Deno has its own distinct runtime and tooling philosophy.
What kind of limitations should users be aware of when considering Bun?
Users should be aware that Bun is still maturing, meaning some Node.js APIs might be missing, and its Windows support is currently limited. While it offers significant speed, it is less battle-tested than older runtimes, and edge cases may occasionally arise.
Does Bun include native TypeScript support?
Yes, Bun offers native TypeScript support, allowing developers to run TypeScript code directly without additional configuration or transpilation steps. This is part of its built-in capabilities as an all-in-one JavaScript and TypeScript runtime.
How is Bun priced?
Bun is free to use, and no paid plan is required to access its features. It provides its fast JavaScript runtime and integrated tooling without any associated cost.
Can Bun replace existing Node.js installations?
Yes, Bun is designed as a drop-in replacement for Node.js, offering compatibility with existing Node.js codebases. This allows for straightforward migration while benefiting from its performance improvements and integrated tooling.
Source: bun.sh