CSV to JSON Converter
Converts tabular data between CSV and JSON formats in either direction.
Runs entirely in your browser — nothing is uploaded or stored.
How to use this calculator
- Paste CSV or a JSON array.
- Press CSV → JSON or JSON → CSV.
How it works
CSV → JSON reads the first row as column names and turns each later row into an object. JSON → CSV does the reverse, flattening an array of objects into a comma-separated table.
Worked example
name,age / Ada,36. becomes [{"name":"Ada","age":"36"}].
Common mistakes
- Forgetting that commas inside fields need quoting, or rows split incorrectly.
- Assuming the first row is data when it is the header — set the header option to match your file.
Frequently asked questions
How does CSV become JSON?
Each row becomes an object keyed by the header columns, so a spreadsheet of people turns into an array of objects ready for code or APIs.
Is my file uploaded?
No — the conversion happens in your browser, so even confidential data stays local.
Does it handle quoted fields with commas inside?
Yes — standard quoted CSV fields parse correctly. Values come through as strings; convert them to numbers afterwards if you need to.
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Cite this tool
Zerdly. (2026). CSV to JSON Converter. Retrieved from https://www.zerdly.com/tools/csv-to-json-converter/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.