Convert a CSV file to a JSON array locally - with column names as keys, no upload, right in your browser.
Running locally on your device ...
Running locally on your device ...
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Your files never left your device
Continue with this file
No re-upload neededThese tools accept .JSON - your file is handed over directly.
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
CSV is the classic table format, JSON the language of modern APIs and web apps. Turning a CSV into JSON is the most common first step to process table data in a program, database or frontend - each row becomes an object, and the header row provides the keys.
This tool parses your CSV entirely locally in your browser (papaparse, pure JavaScript) and outputs a JSON array. By default the first row is used as the column header, so each data row becomes an object with named fields. Numbers are detected as numbers. Nothing is uploaded.
You can use it to feed a test dataset to an interface, fill a mock database or supply configuration rows to a frontend. A practical note: leading zeros of a postal code or article number can vanish during automatic typing, because the text then becomes a number. If that matters, treat the affected columns deliberately as a string before processing further.
Online converters for CSV to JSON often require an account for larger tables or cap the row count significantly on the free tier. This tool has no row limit other than your device memory, needs no account, and even works offline after the first load.
| Input formats | CSV |
|---|---|
| Auto-conversion | ZIP, XLSX, SQLite, DBF, VCF, ICS, DXF, GeoJSON |
| Output format | JSON |
| Batch processing | No |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: The delimiter is auto-detected (comma/semicolon/tab). Without the header option each row becomes an array instead of an object. Numbers are auto-typed; leading zeros may be lost. CSV has no nesting, so the result is a flat JSON array of objects (or arrays) - no nested structures. Very large files need memory.
No. The conversion runs entirely locally in the browser - nothing is sent.
By default yes - the column names become the object keys. Switchable via the option.
Comma, semicolon and tab are auto-detected.
Yes, numeric values are output as numbers in the JSON rather than as text. Be careful with postal codes, phone numbers or article numbers: leading zeros are lost in this typing (01067 becomes 1067). Best give such columns a quick check in the result.
Yes, in any current mobile browser just like on desktop - the file stays local.
No. No account and no artificial row limit - only your device memory sets a boundary for very large files.
Yes. Unlike online converters that upload CSV files to a server, your file stays exclusively on your device here.
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