CSV ↔ JSON
Convert CSV to a JSON array of objects, or flatten JSON back into CSV.
Text & data Client-side Parse + serialise
Tool preview
How to use it
- 01
Choose the direction.
- 02
Paste the source.
- 03
Copy the converted output.
Limitations
- ! The first CSV row is always treated as the header.
- ! Nested JSON objects are flattened to their string form in CSV output.
FAQ
Are quoted fields with commas supported?
Yes, standard CSV quoting with doubled quotes is handled.
What happens with inconsistent column counts?
Missing cells become empty strings; extra cells are dropped.
Is my data uploaded?
No.
Files never leave your device
Processing happens in your browser using the File API, WebAssembly and Web Workers. There is no upload endpoint.
Technical details
- Processing
- Client-side
- Implementation
- Parse + serialise
- Category
- Text & data
- Network requests
- None while processing