HTTP error responses for Node.js APIs

When should a Node.js API usually return 400? When the client sent invalid input it can correct. Example: missing required field, wrong JSON shape, invalid query parameter. Bad request 404 versus 500: what is the difference? A missing order is not the same as a broken server. Compare Can we return 200 with { error: true } so the frontend always parses success? The route received invalid JSON body for a create request. Your line Use the HTTP status to communicate failure, then include a structured problem body for details. A 200 error hides failure from clients, logs, caches, and…

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