What criteria or checkpoints do you use to evaluate the quality of code or product?

To assess the quality of code or a product in Node.js (and in general), I pay attention to the following criteria:

• Readability and maintainability of the code: clear variable and function names, logical structure, comments when necessary.
• Absence of duplication: repetitive code should be extracted into separate functions or modules.
• Error handling: proper use of try/catch, validation of input data.
• Tests: presence of unit and integration tests, coverage of main scenarios.
• Performance: optimization of bottlenecks, use of asynchronous operations.
• Security: protection against injections, proper handling of user data.
• Adherence to style guides: consistent coding style, for example, using ESLint.

These checkpoints help create a quality, reliable, and maintainable product.