CSV to JSON Converter
Upload a CSV or TSV file (or paste your data), choose header and delimiter options, then convert and download the result — free, private, and processed entirely in your browser.
About the CSV to JSON Converter
Our free online CSV to JSON converter turns spreadsheet exports and tabular text into structured JSON. It's useful for feeding a database export into an API, prepping fixture data for a script, or turning a quick spreadsheet dump into a format your code can work with directly.
Unlike most online tools, parsing happens entirely inside your browser using the lightweight PapaParse library — your file is never uploaded to a server. That means it's fast, works without an internet round-trip, and keeps your data completely private and secure.
How to Convert CSV to JSON
Step 1
Upload or paste your data
Upload a CSV, TSV, or TXT file, or paste tabular text directly into the box.
Step 2
Choose your options
Toggle whether the first row is a header, and pick a delimiter (or leave it on auto-detect).
Step 3
Convert and download
Click "Convert to JSON" and download or copy your formatted JSON instantly.
Frequently Asked Questions
What delimiters are supported?
We support standard commas, semicolons, and tabs. The parser can also auto-detect them.
Is my data uploaded to any server?
No, all parsing and JSON conversion happen locally inside your browser; no data leaves your device.
Can I paste data instead of uploading a file?
Yes. Below the upload zone there's a text box where you can paste raw CSV or TSV text directly — no file required.
What happens if a row doesn't match the expected column count?
The parser does its best to align mismatched rows and will flag them as parse warnings in the summary, without stopping the rest of the conversion.
Does it cost money?
No. The CSV to JSON converter is 100% free to use, with no registration or account required.