API returns 200 but the data array is empty: what to check first

A 200 response with an empty data array usually means the request was valid, but the selection criteria returned nothing.

That is different from a transport failure. The server answered, the route existed, and the client received parseable data. The next question is not “why did the API fail?” but “why did this valid request match zero records?” This distinction matters because changing retry logic or error handling will not fix an empty result caused by filters.

Check the request in layers. First confirm the URL, method, authentication state, and environment. A production token against a staging URL, or a staging token against production, can produce valid but surprising emptiness. Then inspect query parameters: page, limit, sort order, status, date range, owner, tag, and search term. Empty data often comes from a filter that is too strict or a default value the UI added silently.

Next, compare the response metadata with the array. Does the API return total count, page count, filter echo, or cursor information? If total is zero, the server found no matching records. If total is positive but the array is empty, pagination or cursor handling may be wrong. If metadata is missing, log the raw response before transforming it.

Also check whether the client is reading the right field. Some APIs wrap lists under data.items, data.results, records, or rows. A client that expects data.data may turn a perfectly valid response into an empty list.

A useful debug note should include the exact URL, query parameters, response status, raw top-level JSON keys, array length, and whether the same request works with relaxed filters. That turns a vague empty-screen bug into a concrete contract check.

API returns 200 but the data array is empty: what to check first

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