JSON ↔ CSV Converter
Convert between JSON and CSV formats instantly. Handles nested objects, supports file upload, and runs entirely in your browser.
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Frequently Asked Questions
Is my data safe?
Yes. This tool runs 100% in your browser. No data is uploaded to any server. Your files and data never leave your device.
Can it handle nested JSON objects?
Yes. Nested objects are flattened using dot-notation keys. For example, {"user": {"name": "John"}} becomes a column "user.name" with value "John".
What is the maximum file size?
Since processing happens in your browser, the limit depends on your device. Most modern browsers handle files up to 50-100MB without issues.
Does it preserve data types?
CSV is a text format, so all values become strings. When converting CSV to JSON, the tool attempts to parse numbers and booleans back to their original types.