Convert CSV to JSON Online

To convert a CSV file to JSON online, upload your file to Large CSV Viewer, optionally filter or sort the rows, then choose Export → JSON from the File menu. The output is a clean JSON array where each row becomes an object with column names as keys. There is no row limit and the conversion is completely free.

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Convert any CSV file to JSON online for free. Upload your CSV, apply optional filters, then export as JSON in one click.

Need to turn a CSV into JSON for an API, a database import, or a frontend project? Large CSV Viewer lets you upload any CSV, preview the data, apply filters if needed, and export the result as a clean JSON array — instantly.

Key features

  • Upload CSV → preview → export JSON in three steps
  • Filter or sort rows before exporting
  • JSON output is a clean array of objects, one per row
  • No row limit — export millions of rows as JSON

How it works

  1. Upload your CSV file. Drop your CSV into the viewer. Your data appears immediately with all columns and rows visible.
  2. Filter or sort (optional). Apply filters to export only the rows you need, or sort the data before converting. This keeps your JSON output clean and relevant.
  3. Export as JSON. Open the File menu and choose 'Export dataset as JSON'. Your file downloads as a JSON array of objects, one per row.

Ready to try it?

Free, instant — no account or install needed.

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Frequently asked questions

What does the JSON output look like?

Each row becomes a JSON object with column names as keys. The full file is exported as a JSON array of these objects.

Can I convert a large CSV to JSON?

Yes. There is no row limit on JSON export. The conversion runs server-side so even multi-million-row files can be exported.

Can I filter the CSV before converting to JSON?

Yes. Apply any combination of column filters, search, and sort before exporting — your JSON will contain only the matching rows.

Is the JSON output minified or pretty-printed?

The JSON export is formatted as a clean array. For minification or pretty-printing, use a tool like jq or a JSON formatter after downloading.

Does converting CSV to JSON preserve data types?

Numbers and booleans detected in columns are preserved as their native JSON types. All other values are exported as strings.