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JSON to CSV Converter

Paste a JSON array of objects to get properly escaped CSV. Nested objects are flattened one level deep. Everything runs in your browser — nothing is uploaded.

About this tool

Takes a JSON array of objects, collects the union of keys across every row (so rows with missing fields still line up), and writes CSV with proper RFC-4180 escaping — fields containing commas, quotes, or newlines are quoted and embedded quotes are doubled. Objects nested one level deep are flattened to parent.child columns; arrays and anything deeper are kept as JSON strings so no data is silently dropped. A single object is accepted too and treated as a one-row array.

Your data never leaves the page — there is no server, no upload, and no tracking of tool inputs. The download is generated locally with a Blob URL.

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Found this useful? 113 free, browser-only tools by Yuvrajsinh Jadav — an engineer who ships production AI systems. No account, nothing sent anywhere.
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