I have written the same throwaway JSON-to-CSV Python script at least a dozen times, import json, import csv, handle the nested dict that always breaks everything, delete the file a week later. The fifteenth time, I finally admitted the pattern: 90{e0bed9560a59d6d3feee569f5ae3dad3ee14a646b3fccc2d16becbf099999e03} of conversions need flattening and headers, not a custom program.
Paste JSON (API responses, Firebase exports, config dumps) and get clean CSV with headers, ready for Excel or Google Sheets. Nested objects get flattened with dotted keys, arrays expand to indexed columns. The in-browser part matters more than it sounds, API payloads often contain customer data you should not be uploading to random converter sites.
Try it now: open the free tool, runs 100{e0bed9560a59d6d3feee569f5ae3dad3ee14a646b3fccc2d16becbf099999e03} in your browser.
Edges worth knowing: deeply nested or irregular JSON (objects with different shapes per row) produces sparse columns, normalize first or accept the gaps. Huge files (tens of MB) belong in a script, not a browser tab. And always spot-check the header row: flattened key names like ‘user.address.city’ are informative but may need renaming before they meet stakeholders.
Bottom line: paste, flatten, download, save the scripting for the weird 10{e0bed9560a59d6d3feee569f5ae3dad3ee14a646b3fccc2d16becbf099999e03}.
Your turn: use the tool free here, no signup, nothing leaves your device.
How do you use JSON ↔ CSV Converter?
Open the JSON ↔ CSV Converter in your browser (Convert JSON arrays to CSV and back, right in your browser). Type or paste your input, adjust the options, and copy the result. Everything runs locally on your device with no account and nothing stored, so the three steps below take seconds even for confidential work.
- Paste or type the value you want converted into the input box.
- Pick the units or format you are converting between.
- Read the converted result and copy it with the copy button.
Try JSON ↔ CSV Converter free. It opens right in your browser.