JSON to CSV Converter

Convert JSON to CSV

JSON Array Input

CSV Output

What Is This Tool?

The JSON to CSV Converter takes a JSON array of flat objects and turns it into a standard CSV file you can open in Excel, Google Sheets, or any spreadsheet tool. It automatically builds the header row from the union of every key found across all objects, so even slightly inconsistent records convert cleanly. All conversion happens locally in your browser — nothing you paste is ever uploaded.

How to Use

Paste a JSON array of objects into the input box.

Click Convert to generate CSV.

Copy the result or download it as a .csv file.

Features

Automatic header detection across all rows
RFC 4180-compliant quoting for commas, quotes, and newlines
Handles objects with slightly different key sets
Copy to clipboard or download as a file
100% client-side — nothing leaves your browser

Examples

Before (JSON):

[
  { "name": "Ada Lovelace", "age": 36 },
  { "name": "Grace Hopper", "age": 85 }
]

After (CSV):

name,age
Ada Lovelace,36
Grace Hopper,85

Common Use Cases

Exporting an API response to a spreadsheet
Preparing data for import into Excel or Google Sheets
Sharing structured data with non-technical teammates
Converting test fixtures for reporting tools

Frequently Asked Questions

What JSON structure does this expect?

A JSON array where every element is a flat object (no deeply nested objects or arrays as values). Each object becomes one CSV row.

What happens if objects have different keys?

The converter builds the header from the union of all keys seen across every object, in the order they first appear. Missing keys produce empty cells.

How are commas and quotes handled?

Any field containing a comma, double quote, or newline is wrapped in double quotes, with internal quotes doubled, following the RFC 4180 CSV standard.

Can I convert a nested JSON object?

Nested objects or arrays inside a field are converted to their JSON string representation inside that cell rather than being flattened into separate columns.

Is my data uploaded anywhere?

No. Conversion happens entirely in your browser using JavaScript. Nothing is sent to a server.

Can I download the result?

Yes, click Download to save the CSV output as a data.csv file.