How to debug a 200 OK response with an empty data array

A 200 OK response with an empty data array should be debugged as a contract question: did the server find no data, hide data, or receive the wrong query?

Start by preserving the exact request. Record method, path, query string, headers that affect routing, caller identity, and the full response body shape. Do not collapse the issue into “API returned nothing.” The difference between `{ data: [] }`, `{ items: [], total: 0 }`, and `{ data: [], next_cursor: null }` matters because each shape says something different about filtering, pagination, and authorization.

Next, compare with a known-good request. Change only one variable at a time: account, workspace, region, date range, status filter, search term, limit, sort, or cursor. If the known-good request returns data, the failure is probably in the input or permission boundary. If both return empty, the problem may be fixture data, indexing, or the endpoint contract.

Check authorization separately. Some systems return empty lists when a user lacks access, while others return 403. If empty-on-no-access is intentional, the client still needs a way to distinguish “no records exist” from “records exist but you cannot see them.” That may require a count field, permission hint, or documentation note.

Finally, inspect pagination and defaults. Empty data often comes from a cursor after the last page, a default date range, a hidden archived filter, or a search term normalized differently than expected. The fix is easier when the debugging note names the specific field that turned a successful request into an empty result.

How to debug a 200 OK response with an empty data array

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