Paste or upload your CSV
Drop in a .csv, .tsv, or plain text export. The file is read locally in your browser instead of being uploaded to a server.
free tool · csv to json
Convert CSV to JSON, right in your browser.
Paste a CSV or drop in a file and get clean JSON in real time. It handles quoted fields, custom delimiters, headers, and type detection. Nothing is uploaded anywhere.
No upload, no signupHandles quoted fieldsAuto delimiter detectionNumber & boolean detection
CSV input
JSON output · 3 rows
Everything runs in your browser. Your file never leaves this page.
Need this inside your own app?
Try Rowslint freeRowslint gives your users a guided CSV import flow with mapping and validation, then sends clean rows to your backend.
01
How to convert CSV to JSON
Use the converter for one-off files, quick debugging, fixtures, API tests, or checking how a customer export will look as JSON.
Choose the output shape
Keep the first row as headers for an array of objects, or turn it off when you need an array of arrays.
Copy or download JSON
Pretty-print the result for review, minify it for fixtures, then copy it or download a .json file.
02
A CSV to JSON converter that gets the edge cases right
Most quick converters break on the messy parts of real CSV files: commas inside quotes, escaped quotes, semicolons from European exports, or IDs with leading zeros. This one is built to handle them.
Quoted fields and commas
Values like "Ortiz, Luis" stay intact. The parser follows the RFC 4180 rules for quotes and escaped quotes, so embedded commas and line breaks do not split a row.
Any delimiter
Comma, semicolon, tab, or pipe. Leave it on auto-detect and the tool guesses from the first line, or pick the delimiter yourself.
Headers to keys
With "first row is header" on, each row becomes an object keyed by your column names. Turn it off to get an array of arrays instead.
Smart type detection
Numbers and true/false become real JSON types, while IDs like 007 and codes stay as strings. Toggle it off to keep everything as text.
Private by design
The conversion runs in JavaScript on this page. Your file is never sent to a server, which matters when the data is customer records.
Copy or download
Grab the JSON with one click, pretty-printed or minified, or download it as a .json file ready to drop into your project.
03
Common CSV to JSON outputs
Different teams expect different JSON shapes. These are the formats people usually need when turning spreadsheet data into application data.
CSV to JSON objects
With headers enabled, each CSV row becomes a JSON object. This is the best shape for API payloads, imports, seeds, and customer records.
CSV to JSON arrays
Turn headers off when the first row is real data or when you need a compact array-of-arrays format for scripts and quick transforms.
Private CSV conversion
Because the conversion runs locally, it is useful for customer exports, sample data, and sensitive files that should not be uploaded to random tools.
Messy spreadsheet exports
Auto-detect handles comma, semicolon, tab, and pipe delimiters, while quote parsing keeps names, addresses, and notes together.
04
Questions about this tool
Short answers for the things people usually ask.
Is this CSV to JSON converter free?
Yes, completely free with no signup. The tool runs in your browser, so there are no usage limits and nothing to install.
Is my data uploaded anywhere?
No. The conversion happens entirely in your browser using JavaScript. Your CSV is never sent to Rowslint or any other server, so it is safe to use with sensitive data.
How does it handle commas inside a value?
Wrap the value in double quotes, like "Ortiz, Luis". The parser follows the standard CSV quoting rules, so commas and line breaks inside quotes are kept as part of the value instead of starting a new field or row.
Can I convert a semicolon or tab-separated file?
Yes. Choose the delimiter from the dropdown, or leave it on auto-detect and the tool will figure it out from the first line. Tab and pipe-separated files work the same way.
Why are some numbers kept as text?
Values with leading zeros (like a 007 ID) or scientific notation are kept as strings so they are not silently changed. Plain integers and decimals become JSON numbers. You can turn type detection off to keep every value as text.
How do I convert CSV to JSON inside my own app?
For a customer-facing import flow, Rowslint embeds a CSV and Excel importer that maps columns, validates rows, and hands clean JSON to your backend. This tool is the quick one-off version of that.
from one-off tools to product workflows
Let customers import CSV and Excel files inside your app.
Rowslint adds mapping, validation, and clean row delivery to your product so your team is not building an importer from scratch.