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CSV to JSON Converter

LOCAL · Browser-Only

Convert CSV data to JSON format with delimiter options and preview

CSV Input

Delimiter:

Output:

Style:

First row is headerTrim whitespaceInfer types (numbers, booleans, null)Transpose (swap rows/columns)

Ctrl+Enter to convert

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What is CSV to JSON Converter?

Free online CSV to JSON converter to paste CSV data and instantly convert it to a JSON array of objects.

Our free online CSV to JSON converter auto-detects delimiters (comma, tab, semicolon), handles quoted fields and escaped characters, and outputs clean, formatted JSON. Preview the parsed data in a table before exporting. Turn an Excel CSV export into a JSON array, convert a CSV into JSON for a REST API, or reshape spreadsheet rows into key-value objects for a database seed. Useful for mock data, importing into MongoDB, or feeding a JavaScript app. All processing happens in your browser - your data stays private. No signup required.

How to Use CSV to JSON Converter

1Paste your CSV data into the input area or upload a CSV file
2Select the delimiter if auto-detection doesn't match your data
3Preview the parsed data in the table view
4Copy or download the converted JSON output

Frequently Asked Questions

How does CSV to JSON conversion work?

The tool reads the first row of your CSV as column headers and creates a JSON object for each subsequent row, mapping column names to values. The result is a JSON array of objects that's ready for use in APIs and applications.

What delimiters are supported?

The converter supports comma, semicolon, tab, and pipe delimiters. It can auto-detect the delimiter from your data, or you can select one manually if auto-detection gets it wrong.

Does it handle quoted fields and special characters?

Yes. The parser handles RFC 4180-compliant CSV data including double-quoted fields, escaped quotes, newlines within quoted strings, and Unicode characters.

Is there a row limit?

There's no artificial limit. Since all parsing happens in your browser, performance depends on your device. Most modern devices handle tens of thousands of rows without issues.

How do I convert an Excel export to JSON?

Save your sheet as CSV from Excel or Google Sheets, then paste it here or upload the file. The first row becomes the JSON keys and each following row becomes an object. If Excel used semicolons as the separator, switch the delimiter so the columns parse correctly.

Are numbers kept as numbers or turned into strings?

Values that look like numbers or booleans can be output as JSON numbers and booleans rather than quoted strings, which is what most APIs expect. Check the preview, and if a field like a ZIP code should stay a string, quote it in the source CSV.

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Keep reading: JavaScript Cheat Sheet and http headers reference. Doing this in code instead? See the encoding endpoints.

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