Convert CSV to JSON
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CSV / TSV
Convert CSV files into a JSON array of objects, ready for APIs, scripts and apps. Delimiters and number types are detected automatically, all in your browser.
- No watermarks
- Fast conversion
- 100 % in-browser
- Zero sign-up
How It Works
Convert CSV to JSON in three quick steps.
Upload CSV files
Drag and drop CSV files or browse your device. You can add several at once.
Convert to JSON
Your browser converts every file locally, so nothing is uploaded.
Download JSON
Save your JSON file, or a ZIP when you converted several files.
What is a CSV to JSON converter?
CSV is easy to export from spreadsheets and databases, but most web code works with JSON. A CSV to JSON converter reads each row, pairs it with the column headings from the first line and outputs a JSON array of objects that you can paste into code or load from an API mock.
The output is pretty-printed with two-space indentation, so it is easy to read and diff.
Typed values
Plain numbers become JSON numbers and true or false become booleans. Values with leading zeros, such as zip codes, stay as strings.
Empty cells become null
Blank fields are written as null so every object has the same keys.
Clean headings
Duplicate headings are renamed (name, name_2) and empty headings become column_1, column_2 and so on.
Delimiter auto-detection
Commas, semicolons, tabs and pipes are recognised, and quoted fields with line breaks are parsed correctly.
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Simple CSV to JSON Conversion
A fast, private way to turn CSV files into JSON.
Quick Conversion
Convert CSV to JSON in seconds. Everything is processed on your device, so there is no upload wait.
Private by Design
Your files never leave your browser. Nothing is uploaded to a server and nothing is stored.
Works Everywhere
Use it on desktop, tablet or phone. There is no software to install and no extension needed.
Completely Free
No account, no watermark and no limit on how many files you convert.
Frequently Asked Questions
Common questions about CSV to JSON conversion.
Upload a CSV file, press Convert and download the .json file. Several CSVs are delivered together as a ZIP.
Yes. The first row is used as the property names. If your file has no header, add one before converting.
Yes, plain numbers become JSON numbers. Values with leading zeros or more than 15 digits stay as strings so they are not altered.
The delimiter is detected automatically.
UTF-8, with or without a byte order mark.
No. The conversion happens locally in your browser.
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