JSON ↔ CSV Converter

JSON to CSV and CSV to JSON — Why Convert?

JSON and CSV are two of the most common data exchange formats. JSON excels at representing nested, hierarchical data and is the native format for APIs and web applications. CSV is the universal format for spreadsheets, databases, and data analysis tools. Converting between them is one of the most frequent tasks in data work.

When to Convert JSON to CSV

• Opening API data in Excel or Google Sheets — Most APIs return JSON, but spreadsheet tools expect CSV or TSV.
• Importing into databases — Many database import tools accept CSV but not JSON.
• Data analysis — Tools like pandas, R, and SQL work naturally with tabular CSV data.
• Sharing with non-technical colleagues — Everyone can open a CSV file.

When to Convert CSV to JSON

• Feeding data to APIs — REST APIs typically accept JSON payloads.
• Configuration files — Many applications use JSON for settings and data.
• Web applications — JavaScript works natively with JSON objects.
• NoSQL databases — MongoDB, CouchDB, and Firebase use JSON-like documents.

How This Tool Handles Nested Data

Real-world JSON is often nested — objects within objects, arrays within arrays. When "Flatten nested objects" is enabled, nested keys are joined with dots. For example, {"address": {"city": "Austin"}} becomes a column named address.city with the value Austin. Arrays are joined with commas.

Privacy & Security

This tool processes everything in your browser using JavaScript. No data is uploaded, transmitted, or stored on any server. Your data never leaves your device.