Formatted requirements.txt will appear here...
Format options
What is Python Requirements.txt Generator & Validator?
A requirements.txt file tells pip which Python packages (and versions) to install for a project. When packages lack version pins, different environments may install incompatible versions — causing "works on my machine" bugs. This tool validates your requirements.txt format, flags missing version pins and duplicate packages, and exports a clean, sorted file ready for your project.
How to Use
- Paste your requirements.txt content into the input panel.
- Click "Validate & Format" to check for issues.
- Review errors (invalid syntax, duplicates) and warnings (unpinned packages).
- Toggle formatting options: sort alphabetically, strip comments, etc.
- Click "Copy Output" to copy the cleaned requirements.txt.
- Use "Load Sample" to see a file with common issues pre-loaded.
Why Use This Tool?
Tips & Best Practices
- Use == for exact pinning in production (requests==2.31.0) to ensure reproducible installs
- Use ~= for compatible releases: flask~=2.3 means >=2.3, <3.0 — good for libraries
- Use pip freeze > requirements.txt to generate a pinned file from your active environment
- Consider splitting requirements: requirements.txt (prod), requirements-dev.txt (dev/test)
- Use pip-tools (pip-compile) to automatically resolve and pin all transitive dependencies
Frequently Asked Questions
What is the difference between == and ~= in requirements.txt?
== (compatible release) means exact version: requests==2.31.0 installs only 2.31.0. ~= means compatible release: flask~=2.3 means ">=2.3, <3.0" (allows patch and minor bumps but not major). Use == for reproducible deployments, ~= for libraries where you want to allow minor updates.
Why are unpinned packages dangerous in production?
If you write just "requests" without a version, pip installs the latest version at the time of install. Different developers or deployment runs may get different versions. A new version might introduce breaking changes or security issues. Always pin versions in production: requests==2.31.0.
How do I generate requirements.txt from my current environment?
Run "pip freeze > requirements.txt" in your activated virtual environment. This outputs every installed package with its exact version. For a cleaner file with only your direct dependencies (not transitive ones), use pipreqs: run "pipreqs /path/to/your/project" after installing it with pip install pipreqs.