How does CSV to JSON conversion work?

CSV to JSON conversion parses each row of the CSV file and maps it to a JSON object using the header row as keys. For example, a CSV with headers "name,age" and a row "Alice,30" becomes {"name": "Alice", "age": "30"}. The result is an array of these objects.

What delimiters are supported?

This tool supports comma (,), semicolon (;), tab, and pipe (|) delimiters. It can also auto-detect the delimiter by analyzing the first few lines of your data. TSV (tab-separated values) files are fully supported.

Can this tool handle large CSV files?

Yes, this tool processes data entirely in your browser using efficient parsing. It can handle files with thousands of rows. For very large files (millions of rows), you may experience slower performance depending on your device, as all processing happens client-side.

CSV to JSON Converter — Free Online Tool

CSV to JSON Converter Online

Convert CSV files and data to JSON format instantly in your browser.

Processed locally in your browser

CSV Input

Drag & drop a .csv, .tsv, or .txt file here

or click to browse

Parser Options

Delimiter

First row is headerTrim whitespaceSkip empty lines

JSON Output

Output Format

Array of Objects— Uses first row as keysArray of Arrays— Raw rows including headerColumn Arrays— { col: [...values] }

Minified output

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How to Use

Convert CSV or TSV data to JSON format instantly with this free online tool.

Paste CSV data into the input area, or upload a .csv or .tsv file.
The delimiter is auto-detected, or you can select comma, semicolon, tab, or pipe manually.
Choose your output format: array of objects, array of arrays, or column arrays.
Toggle options like header row detection, whitespace trimming, and empty line skipping.
Click Copy to copy the JSON output, or Download to save as a .json file.

All conversion happens in your browser — your data never leaves your device.

Features

✓Auto-detect delimiters
✓Multiple output formats
✓Handles quoted fields & escapes
✓File upload with drag & drop
✓One-click copy & download
✓No data leaves your browser

Frequently Asked Questions

How does CSV to JSON conversion work?: CSV to JSON conversion parses each row of the CSV file and maps it to a JSON object using the header row as keys. For example, a CSV with headers "name,age" and a row "Alice,30" becomes {"name": "Alice", "age": "30"}. The result is an array of these objects.
What delimiters are supported?: This tool supports comma (,), semicolon (;), tab, and pipe (|) delimiters. It can also auto-detect the delimiter by analyzing the first few lines of your data. TSV (tab-separated values) files are fully supported.
Can this tool handle large CSV files?: Yes, this tool processes data entirely in your browser using efficient parsing. It can handle files with thousands of rows. For very large files (millions of rows), you may experience slower performance depending on your device, as all processing happens client-side.