Typer
Typer is a library for building CLI applications based on Python type hints. It is easy to code and use, with automatic help and completion for all shells. It also includes a command line tool to run scripts, automatically converting them to CLI applications.
Key facts
What is Typer?
Build great CLIs easily with Python type hints, automatic help, and completion.
Who is Typer best for?
Python developers
What are its main limitations?
- Only available for Python environments
Limitations are based on product materials or editorial synthesis; confirm on the official site.
When was this information verified?
July 18, 2026
Sources
- Official homepageofficial homepage · Jul 18, 2026
Key features
- ✓Intuitive to write with great editor support and completion everywhere
- ✓Automatic help and command completion for all shells
- ✓Minimize code duplication with multiple features from each parameter declaration
- ✓Start simple: only two lines of code (one import, one function call)
- ✓Grow into arbitrarily complex command trees with subcommands, options, and arguments
- ✓Run scripts without using Typer internally via the `typer` command
- ✓Automatic --install-completion when creating a package
Use cases
- →Building command-line interfaces for Python applications
- →Automating scripts with a full CLI wrapper
- →Creating multi-command applications with subcommands and options
- →Adding a CLI to existing Python scripts with minimal changes
Pros
- +Easy to learn and use, with less time spent reading docs
- +Based on Python type hints, leveraging editor support
- +Automatic help messages and shell completion for end users
- +Can be used purely as a command-line tool to run scripts
Cons
- −Only available for Python environments
Positioning
- Core value: Build great CLIs easily with Python type hints, automatic help, and completion.
- Ideal for: Python developers
- Product type: Python library (pip installable)
Frequently asked questions
What is Typer?
Typer is a library for building CLI applications that users will love using and developers will love creating, based on Python type hints.
How do I install Typer?
Create and activate a virtual environment and then run: pip install typer
How do I use Typer in my code?
Add import typer and use typer.run() to wrap a function, or create a typer.Typer app with subcommands via @app.command().
Is Typer free?
Yes, Typer is open-source (available on GitHub) and free to use.
Can I use Typer without writing any Typer code?
Yes, you can use the provided `typer` command to run any Python script as a CLI application, even if it doesn't import Typer.
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