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Bun vs Deno
Deno is a separate runtime focused on security, while Bun integrates runtime, package manager, test runner and bundler in one binary.
BunFast JavaScript runtime, bundler, test runner and package manager
DenoSecure runtime for JavaScript and TypeScriptWhich to pick
Pick Bun if you want…
- All-in-one JS runtime & toolkit
- Fast runtime with bundler and test runner
- A free, open-source tool
- Integrations with Node.js, Yarn or pnpm (on Bun's list, not Deno's)
Pick Deno if you want…
- Secure, all-in-one JS/TS runtime
- Secure runtime for JavaScript/TypeScript
- Integrations with Node, ESM or CommonJS (on Deno's list, not Bun's)
Bun is a fast runtime but lacks Deno's built-in security model and integrated tooling suite.
Side by side
- What it is
- Bun:Bun is a fast JavaScript runtime that combines a package manager, test runner, and bundler in a single binary.
- Deno:Deno is a fast, secure JavaScript/TypeScript runtime with built-in package manager, testing, linting and more.
- Best for
- Bun:All-in-one JS runtime & toolkit
- Deno:Secure, all-in-one JS/TS runtime
- Who it’s for
- Bun:JavaScript/TypeScript developers looking for an all-in-one toolchain
- Deno:Web developers and teams needing a Node-compatible runtime with security defaults.
- Pricing
- Bun:Free
- Deno:Freemium
- Plans
- Bun:—
- Deno:Free $0/month · Pro $20/month per month · Builder $200/month per month
- Open source
- Bun:Yes, 96,095 GitHub stars
- Deno:Yes, 108,548 GitHub stars
- Works with
- Bun:Node.js, npm, Yarn, pnpm, TypeScript, React, Next.js, Remix
- Deno:TypeScript, npm, Node, ESM, CommonJS, Docker, Deno Deploy, Deno KV
Bun features
- Fast runtime. Runs JavaScript and TypeScript on JavaScriptCore with Node.js API compatibility.
- npm-compatible package manager. Installs packages up to 30× faster than npm, with workspaces and lockfile support.
- Jest-compatible test runner. Runs tests with expect(), mocks, snapshots and DOM support in milliseconds.
- Built-in bundler. Bundles TS, JSX, CSS and HTML for browsers and servers, with HMR dev server.
- Single-file executables. Compiles apps and the Bun runtime into a cross-platform binary.
- Integrated APIs. Provides built-in SQL, S3, Redis and shell APIs accessible from route handlers.
Deno features
- Built-in tooling. Package manager, test runner, formatter, linter, task runner, type checker and more are included out of the box.
- Zero-setup TypeScript & npm. Run TypeScript and import npm packages directly without tsc, bundlers or extra config.
- Granular security. File system, network and environment access are denied by default and can be granted per-permission flag.
- Standard library. Audited, dependency-free modules for collections, dates, parsing and other common utilities.
- OpenTelemetry & profiling. Native tracing, profiling and debugging support without external agents.
- Cross-platform deployment. One binary runs on Linux, macOS and Windows; Docker images and Deno Deploy edge platform are available.
- Deno Desktop. Build native cross-platform desktop apps from the same TypeScript/JS codebase without Electron.
- Deno Deploy hosting. Edge-ready hosting with automatic scaling, KV storage, sandboxes and observability.
Bun vs Deno FAQ
Is Bun or Deno free?+
Bun is free. Deno has a free plan; paid plans start at $20/month (Pro).
Which is cheaper, Bun or Deno?+
Bun is free, so it costs less. Deno starts at $20/month (Pro).
Is Bun or Deno open source?+
Yes, both are open source: Bun (oven-sh/bun on GitHub) and Deno (denoland/deno on GitHub, MIT license).
Do Bun and Deno integrate with the same tools?+
Partly. Both list npm and TypeScript. Bun also lists Node.js, Yarn, pnpm, React and 7 more; Deno also lists Node, ESM, CommonJS, Docker and 3 more.
On DevHunt
Based on each tool's website and DevHunt data. Details may change; check the official sites.