Converts CSV to a JSON array of objects. First row becomes keys, remaining rows become values.
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Auto-Detect Delimiter
Auto-detect mode analyses the CSV to identify commas, semicolons, tabs or pipes automatically.
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Auto-Parse Numbers
Numeric-looking values are automatically converted to JSON numbers (not strings) for proper data typing.
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100% Private
All conversion runs in JavaScript in your browser. Your data is never sent to any server.
⭐ User Reviews
4.9
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Based on ratings from verified users · 99% recommend
C
Clara M.
Yesterday
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Auto-detect delimiter is brilliant — I paste CSVs from different sources and it always picks the right separator. The auto-parse numbers option means I don't have to type-cast values in my code.
CSV to JSON
H
Harry T.
3 days ago
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Converted a 2,000-row CSV export from Excel to JSON in seconds. The row and column count stats give me confidence before downloading. Perfect for data pipeline work.
CSV to JSON
A
Amara K.
1 week ago
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The tab-delimited support is essential for TSV files from our database exports. The pretty print option produces nicely indented JSON that's immediately readable. 5 stars.
CSV to JSON
V
Vera L.
2 weeks ago
⭐⭐⭐⭐⭐
I use this with the JSON to CSV tool as a pair — they are perfectly complementary. CSV to JSON for ingesting data, JSON to CSV for exporting. Both are fast, accurate and private.
CSV to JSON
📖 How to Use
1
Paste CSV Data
Paste your CSV data into the input field. First row becomes the JSON keys.
2
Configure Options
Set delimiter (or auto-detect), toggle number parsing and pretty print.
3
Convert
Click Convert to JSON. The JSON array appears on the right with row/column count.
4
Copy or Download
Click Copy JSON or Download .json for a ready-to-use file.
Any standard CSV with consistent rows. The first row is used as keys when "First row as headers" is checked. Quoted fields containing commas or newlines are handled correctly. Encoding should be UTF-8.
How does auto-detect delimiter work?+
The tool counts occurrences of comma, semicolon, tab and pipe in the first line and picks the most frequent one. This works correctly for the vast majority of CSV files from common sources.
What does auto-parse numbers do?+
With auto-parse numbers enabled, any column value that is a valid finite number (integer or decimal) is converted from a string to a JSON number. This means {"age":"30"} becomes {"age":30} — correct for downstream code.
What if my CSV has inconsistent columns?+
If rows have different numbers of fields, missing values are set to an empty string. Extra values beyond the header count are discarded. This matches the behaviour of most CSV parsers.
Can I convert back from JSON to CSV?+
Yes — use the JSON to CSV tool to reverse the process. It accepts a JSON array of objects and produces a clean CSV file.
💡 Why Use This Tool?
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100% Private
All processing runs in your browser — your code and data never leave your machine.
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Instant
Results appear as you type or with a single click — no waiting.
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Copy & Download
Copy the output to clipboard or download as a file with one click.
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Free & No Login
Completely free, no account required, unlimited use.