AI Toolkit

JSON ↔ CSV Converter

Free

Convert between JSON and CSV formats instantly. Everything runs in your browser — your data never leaves your device.

Converter
Choose a direction, paste your data, and click convert.
Client-Side Processing
Your data never leaves your browser. No uploads, no servers, no tracking.
Nested JSON Support
Handles deeply nested objects and arrays using dot notation (e.g. address.city).
No Signup Required
Use it as many times as you want. No accounts, no limits, no nonsense.

How the JSON to CSV Converter Works

This tool converts JSON (JavaScript Object Notation) to CSV (Comma-Separated Values) and vice versa. It handles arrays of objects, nested structures, and edge cases like commas and quotes within field values.

When converting JSON to CSV, nested objects are flattened using dot notation. For example, an object like { "address": { "city": "London" } } becomes a column called address.city. Arrays of primitive values are joined with commas within a single cell.

When converting CSV to JSON, you can optionally unflatten dot-notation headers back into nested objects. Numeric values, booleans, and null are automatically detected and preserved as their correct types.

Common Use Cases

  • Export API response data to CSV for analysis in Excel or Google Sheets
  • Convert a spreadsheet into JSON for importing into a database or API
  • Flatten nested JSON from MongoDB, Firebase, or Supabase exports
  • Quick data format conversion during development and debugging
  • Prepare JSON payloads from CSV files for bulk API operations