JSON → CSV Converter

JSON to CSV Converter — fast, free, client-side

The JSON → CSV tool converts a JSON array of objects into a CSV table instantly in your browser. No server uploads, no registration — all processing happens locally in JavaScript. Choose a delimiter, copy the result to your clipboard or download a ready-to-use .csv file.

Supported input formats

• Array of objects — primary format: [{"a":1},{"a":2}]. Keys from the first object become column headers;
• Single object — automatically wrapped into a one-row array;
• Nested objects and arrays — serialized as a JSON string in the cell, quoted per RFC 4180;
• Null and undefined values — output as an empty cell.

Frequently Asked Questions

• What JSON format does the converter accept?

  The converter expects a JSON array of objects — for example, [{"name":"Alice","age":30}]. The keys of the first object become the CSV column headers. A single object is automatically wrapped into a one-row array.

• How are nested objects and arrays handled?

  If a field value is an object or array, it is serialized as a JSON string and placed in the CSV cell with quotes. To fully flatten nested structures, normalize your JSON data first.

• Which delimiter should I choose?

  Comma is the RFC 4180 standard, supported by Google Sheets, pandas, and most BI tools. Semicolon is the default in Excel on Windows with European locale settings. Tab (TSV) is ideal for pasting directly into spreadsheets without delimiter conflicts.

See also

• JSON Formatter & Validator
• XML Formatter
• Base64 Encoder / Decoder
• URL Encoder / Decoder
• Diff Tool — text comparison