JSON to CSV Converter

Convert complex JSON arrays to flat CSV files with smart object flattening and RFC 4180 compliance.

Tool Area

Instant client-side processing

JSON to CSV

Smart flattening & data transformation

JSON Source

Flatten

CSV Output

Ready for conversion

## Turn JSON into Spreadsheets JSON is great for code, but terrible for humans. The **JSON to CSV Converter** flattens complex data structures into a readable table that you can open in Excel, Google Sheets, or Numbers. ### Key Features - **Smart Flattening**: We automatically convert nested objects like `{"user": {"name": "Alice"}}` into column headers like `user.name`. - **Array Handling**: Lists of items are converted into readable string representations or expanded rows. - **RFC 4180 Compliant**: We handle commas, quotes, and newlines correctly so your CSV doesn't break when opened in Excel. ### Use Cases - **Reporting**: Convert API responses into a monthly report for your boss. - **Data Migration**: Move data from a NoSQL database (MongoDB) to a SQL database or CRM. - **Auditing**: Scan large JSON logs in a spreadsheet to filter and sort errors. ### Security Your data is processed 100% in your browser. We never see your files, making this safe for internal company data.

Common Questions

QHow does it handle nested arrays?

By default, arrays are stringified (e.g., "['item1', 'item2']"). We are working on an 'unwind' feature to create multiple rows for array items.

QWhy do some columns have empty values?

JSON is schema-less, meaning not every object has every key. If a key is missing in one record, the corresponding CSV cell will be empty.

QCan I use this for big files?

Yes. The conversion is highly optimized. However, trying to open a CSV with >1 million rows might crash Excel, even if our tool generates it successfully.

QWhat is the delimiter?

We currently use a standard comma (`,`).