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JSON → CSV

Convert a JSON array of objects to CSV. Headers are extracted from the first object's keys.

Convert JSON to CSV online: export API data to spreadsheets instantly

APIs return data in JSON, but stakeholders want spreadsheets. This tool bridges that gap by converting a JSON array of objects into a clean, RFC 4180-compliant CSV file in your browser: no upload, no server, no waiting. Paste in your API response, download the CSV, and open it in Excel or Google Sheets in seconds.

The converter auto-detects all column headers from the union of keys across all objects, handles missing fields gracefully with empty cells, and properly escapes values that contain special characters. The result is a file that opens correctly in any spreadsheet application.

Step-by-step guide

  1. 1
    Paste your JSON array
    Enter or paste a JSON array of objects into the input panel. Each object represents one row in the CSV output.
  2. 2
    Headers are auto-detected
    The tool scans all objects and builds a unified header row from the union of all keys across every object.
  3. 3
    Preview the CSV output
    The generated CSV appears instantly. Values containing commas, quotes, or newlines are automatically quoted and escaped.
  4. 4
    Download or copy
    Click Download CSV to save a .csv file, or click Copy to put the text on your clipboard.
  5. 5
    Open in a spreadsheet
    Import the downloaded CSV into Excel, Google Sheets, or any other spreadsheet application for further analysis.

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Frequently Asked Questions

What JSON structure does this tool expect?
The tool expects a JSON array of objects (rows). Each object's keys become the CSV column headers and the values become the cell contents.
What happens if some objects are missing certain keys?
Missing keys produce empty cells in the output. The header row includes all keys found across all objects in the array.
How are values with commas or quotes handled?
Values that contain commas, double-quote characters, or newlines are automatically wrapped in double quotes and internal quotes are escaped by doubling them, following the RFC 4180 CSV standard.
Can I convert nested JSON objects?
Nested objects are serialised as JSON strings in the cell. For deeply nested data it is often better to flatten the structure before converting.
What encoding does the downloaded CSV use?
The downloaded file uses UTF-8 encoding, which is compatible with most modern spreadsheet applications. Excel on Windows may need the file saved with a BOM for automatic detection.
Is there a row limit?
No server-side limit. Very large arrays (tens of thousands of rows) may take a moment to process depending on your browser and device.
Is my JSON data sent to a server?
No. All conversion happens in your browser. Your data is never transmitted or stored anywhere.
Is this tool free?
Yes, completely free with no account, no sign-up, and no usage limits.

AlteredIdea vs alternatives

vs server-side converters: AlteredIdea converts in your browser: your data never leaves your device.

vs writing scripts: Instant results, no coding needed.

vs paid tools: Completely free, no account required.

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