Bun vs FastAPI
A detailed comparison to help you choose the right framework & development for your business needs.
Platform Overview
Both Bun and FastAPI are popular framework & development solutions. Here's how they compare.
Bun
An all-in-one JavaScript runtime, bundler, transpiler, and package manager designed for speed and developer experience.
FastAPI
A modern, high-performance Python web framework for building APIs with automatic OpenAPI docs and type validation.
Feature Comparison
Bun Features
- Ultra-fast JavaScript runtime
- Built-in bundler and transpiler
- Native TypeScript support
- npm-compatible package manager
- SQLite driver included
FastAPI Features
- Automatic OpenAPI documentation
- Type-based validation with Pydantic
- Async and high-performance
- Dependency injection system
- WebSocket support
Best For
Bun — Best For
- High-performance JavaScript servers
- Fast development toolchain
- Drop-in Node.js replacement
FastAPI — Best For
- Python REST API development
- ML model serving endpoints
- High-performance Python backends
Our Verdict
Both Bun and FastAPI are excellent choices. Bun excels at high-performance javascript servers, while FastAPI shines at python rest api development. The best choice depends on your specific needs, budget, and technical requirements.
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Frequently Asked Questions
Which is better, Bun or FastAPI?
Neither is universally better — it depends on your needs. Bun is best for high-performance javascript servers, while FastAPI excels at python rest api development. We can help you evaluate which fits your business.
Can I switch from Bun to FastAPI?
Yes, migration is possible. The complexity depends on your current setup and data. Our team can plan and execute a smooth migration with minimal downtime.
Can I use Bun and FastAPI together?
In many cases, yes. Bun and FastAPI can complement each other depending on your architecture. We can advise on the best integration strategy.
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