Just File Tools

CSV to JSON

Convert CSV data to JSON format

How to CSV to JSON Online

Convert CSV (comma-separated values) data into JSON format instantly in your browser.

  1. Paste your CSV data into the input area on the left. The first row should be headers.
  2. Click the "Convert to JSON" button to parse and transform the data.
  3. Review the resulting JSON in the output area on the right.
  4. Click "Copy" to copy the JSON output to your clipboard.

About CSV to JSON

CSV (Comma-Separated Values) is one of the most common formats for tabular data, used by spreadsheets, databases, and data exports. However, many modern applications and APIs expect data in JSON format. This tool bridges that gap by converting CSV data to a clean JSON array of objects, with column headers as keys.

The parser handles common CSV edge cases including quoted fields (for values that contain commas), escaped quotes within quoted fields, and rows with varying numbers of columns. Each row becomes a JSON object where the keys come from the first header row, making the output ready for use in JavaScript applications, API requests, or database imports.

All processing runs locally in your browser using JavaScript. Your data is never sent to any server, making this safe to use with proprietary or sensitive datasets. Simply paste, convert, and copy — no accounts, no uploads, no data collection.

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Frequently Asked Questions

What CSV format is expected?

The first row should contain column headers separated by commas. Each subsequent row should contain data values in the same order. Quoted values (e.g., "Smith, John") are supported for fields that contain commas.

Can I convert large CSV files?

This tool processes everything in your browser, so it works well for files up to a few megabytes. For very large datasets, you may experience slower performance depending on your device.

What does the JSON output look like?

The output is a JSON array of objects, where each object represents one row and the keys are the column headers from the first row of your CSV.

Is my data sent to a server?

No. All parsing and conversion happens entirely in your browser. Your CSV data never leaves your device.