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Flatten complex JSON data into clean CSV spreadsheet format, ready for analysis or import.
Upload your JSON file or paste JSON data
Nested objects and arrays are automatically flattened
Click "Convert to CSV" to transform your data
Download the CSV file or copy the output
Handles nested JSON objects with dot-notation flattening
Array handling with intelligent expansion
Preserves all data types in CSV output
Clean header generation from JSON keys
Works entirely in your browser for maximum privacy
Nested objects are flattened using dot notation (e.g., "address.city"). Arrays are expanded into separate columns or rows depending on structure.
Yes, JSON arrays of objects are converted to rows, with object keys becoming column headers.
The converter handles this gracefully — all unique keys across all objects become CSV columns, and missing values are left empty for objects that lack a particular key.
Yes. The CSV output follows RFC 4180 standards with proper quoting and escaping, making it compatible with virtually all spreadsheet applications.
JSON (JavaScript Object Notation) is a hierarchical data format that supports nested objects and arrays, while CSV (Comma-Separated Values) is a flat, tabular format. Converting JSON to CSV requires "flattening" — transforming nested structures into rows and columns. This process involves mapping object keys to column headers and object values to row cells. The main challenge is handling nested data: our converter uses dot-notation flattening (e.g., "user.address.city") to preserve the relationship between nested fields while producing a clean, importable spreadsheet.
This tool is particularly useful when: