CSV to JSON Converter
Converts tabular data between CSV and JSON formats in either direction.
Designed to process your files locally in your browser. Zerdly does not intentionally upload or store them unless this page says otherwise.
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.
Designed to run locally in your browser. Tool inputs are not intentionally stored by Zerdly unless stated otherwise.