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by benmanns 4443 days ago
I would suggest reading through the Express (or any popular project) source code to improve yourself as a JavaScript developer. As you do, there will inevitably be things you notice that should be fixed. E.g. typos, edge cases, refactoring[0]. Fixing those will help you familiarize yourself with the project, the process, and will eventually lead to bigger contributions.

[0] Though be careful with that. Only refactor stuff if you're pretty confident about how it works, and that your changes don't decrease performance or readability.