The answer
Mount routers under /api/v1, /api/v2, etc. Each version has its own router. Bump the version on breaking changes. Non-breaking changes (adding fields) do not need a new version.
Express Routing Interview Questions and Answers
How do you version an Express API?
More FAQs in Express Routing Interview Questions and Answers
A binding between an HTTP method, a URL path, and a handler function. app.get('/users/:id', getUser) is a route. Express dispatches the matching handler when a request comes in.
In declaration order. The first matching route wins. This is why specific routes must come before wildcards, and /me before /:id. Wrong order causes silent bugs where routes never get hit.
In Express 4, wrap with asyncHandler that catches promise rejections and calls next(err). In Express 5, async errors are caught automatically. Use a custom ApiError class with status and message.
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