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JSON to CSV Converter

Convert a JSON array of objects into CSV with a header row.

APIs speak JSON; spreadsheets and BI tools want CSV. The conversion looks trivial until real data arrives: objects with inconsistent keys, values containing commas and quotes, nested structures. Naive string-joining produces corrupt CSV that Excel mangles silently.

This converter handles those cases properly: it unions the keys across all objects into a complete header row, quotes fields per RFC 4180, and serializes nested objects/arrays as JSON strings so no data is lost. Paste JSON, copy CSV, open in any spreadsheet.

How to use JSON to CSV Converter

  1. 1

    Paste a JSON array

    An array of objects, e.g. an API response.

  2. 2

    Review the CSV output

    Headers are derived from all object keys.

  3. 3

    Copy or download

    Paste into Excel/Sheets or save as .csv.

Features

  • Header row unioned across all objects
  • RFC 4180 quoting for commas, quotes and newlines
  • Nested objects preserved as JSON strings

Frequently asked questions

Common mistakes to avoid

  • Passing a single object or a nested payload instead of an array — wrap it or extract the array property first.
  • Assuming column order matches the first object — keys from later objects append after.
Written by Converter Portal Editorial TeamPublished July 23, 2026Last updated July 23, 2026

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