Comparing
FastAPI framework, high performance, easy to learn, fast to code, ready for production
Typer, build great CLIs. Easy to code. Based on Python type hints
| Metric | fastapi | typer |
|---|---|---|
| Ecosystem | Python | Python |
| Difficulty | Beginner ✓ | Intermediate |
| Weekly downloads | 0 | 0↑ |
| Latest version | v0.135.2 | v0.24.1 |
| Recipes | 1 | 4↑ |
fastapi only
Shared
typer only
Use FastAPI when building REST or GraphQL APIs in Python, especially when you need async support, automatic OpenAPI/Swagger docs, request validation, or are building microservices. It's the best choice for new Python API projects.
Use Typer when you're already writing typed Python code and want to expose it as a CLI with minimal boilerplate. It's especially good for tools used internally or distributed as packages where IDE support matters.
FastAPI is API-only — it has no templating, admin interface, or ORM. For full-stack web apps with server-rendered HTML, Django is better. For tiny internal tools, Flask's smaller learning curve might be preferable.
Typer's magic can be surprising — if you need precise control over how arguments are parsed, displayed, or composed, drop down to Click directly. For simple one-file scripts, Click or even argparse may be clearer.
fastapi
typer