Convert JSON to CSV — Arrays, Nested Objects, Any Shape

Working with API responses, MongoDB exports or analytics payloads almost always means dealing with JSON. But the moment you want to open that data in Excel, Google Sheets, Numbers or hand it to a non-technical colleague, you need CSV. Our JSON to CSV converter turns any well-formed JSON array (or single object) into a clean, RFC 4180-compliant CSV file in your browser.

The converter handles the tricky parts for you. **Nested objects** like `{"address": {"city": "Paris"}}` can be flattened into dot-notation columns (`address.city`) so every leaf value becomes its own column. **Arrays of primitives** like `["admin", "beta"]` are joined with semicolons so they stay in a single cell. **Special characters** — commas inside values, double quotes, line breaks — are properly escaped with quoting and doubled quotes, exactly as Excel and every spreadsheet tool expect.

You can choose your delimiter (comma, semicolon, tab or pipe), toggle the header row on or off, and decide whether to flatten nested objects or keep them as JSON strings inside cells. Loading data is flexible too: paste JSON directly, upload a `.json` file from your computer, or fetch from a URL — handy for pulling straight from a public API.

Everything runs locally in your browser. Your JSON is parsed, transformed and serialized on your device — nothing is uploaded, logged or stored. That makes the tool safe for sensitive payloads like customer exports, internal API responses or anything containing tokens or PII.