API Response to Excel & CSV

API responses are built for machines, not for people. A typical REST endpoint returns an array of objects, often wrapped in a data or results envelope, with fields nested several levels deep. Reading that in a raw JSON viewer is fine for debugging, but useless the moment a product manager, client, or analyst asks for "the numbers in a spreadsheet." This tool closes that gap without a script.

Paste the response and each record in the array becomes a row; the union of all keys becomes the header row. Nested objects are flattened with dot notation, so a field like { "customer": { "plan": "pro", "mrr": 49 } } lands in the columns customer.plan and customer.mrr. Arrays of scalars are joined into one cell. If your payload is wrapped (for example { "data": [ ... ] }), copy the inner array so each element maps cleanly to a row — the preview makes it obvious when the shape is right.

Typical uses: exporting a paginated API result set to Excel for a stakeholder report; pulling a list of users, orders, or events into CSV for a Google Sheets pivot; sanity-checking that an integration returns the fields you expect by eyeballing them as a table; attaching a clean spreadsheet to a bug ticket instead of a JSON dump. It is a paste-and-download workflow — no SDK, no CLI, no writing a one-off flattening function again.

Everything is processed server-side in a second or two and the file is deleted after 15 minutes. For plain JSON files or a formatted PDF table, use the main JSON converter; for a quick JSON to Excel export, use the JSON to Excel tool.