CSV to JSON
Convert delimited files into typed JSON records.
Drop a CSV, TSV or pipe-delimited file and get a JSON array with real types. Header names become keys, numeric and boolean columns are detected automatically, and you can preview the result before copying it.
- Price
- Free
- Your files
- Never uploaded
- Runs
- In your browser
or drag it here
.csv, .tsv, .txt · up to 50 MB · processed locally, never uploaded
Excel and spreadsheet files only. Export from Google Sheets as .xlsx or .csv.
Files stay on your device
What it does well
- Quoted fields with embedded delimiters and newlines parsed correctly
- Type inference for integers, decimals, booleans and ISO dates
- Streaming parser that handles files far larger than memory-bound alternatives
How to use CSV to JSON
- 1
Upload or paste your delimited data.
- 2
Confirm the detected delimiter and header row.
- 3
Choose typed or all-string output.
- 4
Copy the JSON or download the file.
Watch a walkthrough
Common problems and fixes
Values keep their surrounding quotes in the JSON.
The file uses a non-standard quote character. Set it explicitly in the advanced options rather than relying on detection.
Large integers lose precision.
JSON numbers are IEEE doubles. Enable “Big numbers as strings” to keep 19-digit IDs exact.
Frequently asked questions
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