What encoding does this support?

UTF-8 is assumed. CSV files with Windows-1252 or Latin-1 encoding may show garbled characters for non-ASCII text. If that happens, open the file in a text editor, save it as UTF-8, and re-upload.

Is my CSV file uploaded to a server?

No. The conversion runs entirely in your browser using PapaParse, a JavaScript CSV parsing library. Your data never leaves your device.

Can I convert CSV to Excel?

Yes — use the CSV to Excel tool. It converts your CSV directly to an .xlsx file that opens in Excel, Google Sheets, and Numbers.

Can I go the other direction — JSON to CSV?

Yes. The JSON to CSV tool converts a JSON array of objects into a CSV file. Paste your JSON and download the result.

No upload · 100% free · Works in your browser

CSV to JSON, instantly.

Convert CSV files to JSON in your browser. Nothing is uploaded. Ever.

First row is a header

Drop a CSV file here

or browse files·.csv files

Files stay on your device — nothing is uploaded

Why convert CSV to JSON?

CSV is the lingua franca of tabular data — spreadsheets, database exports, analytics tools, and APIs all use it. But modern JavaScript applications, REST APIs, and NoSQL databases speak JSON. Converting CSV to JSON lets you load spreadsheet data directly into code without writing a parser.

→Import spreadsheet data into a JavaScript or Python application
→Feed a REST API that expects JSON request bodies
→Load data into MongoDB, Firestore, or another document database
→Preview a large CSV dataset as structured JSON before processing

How to convert CSV to JSON

1
Drop your CSV file
Drag a .csv file onto the converter or click to browse. Only one file at a time is supported for this conversion.
2
Toggle header row if needed
If your CSV has a header row (column names in the first row), leave the checkbox ticked. Untick it for headerless files.
3
Preview the JSON
The converted JSON appears instantly in a preview panel below the tool.
4
Copy or download
Click Copy JSON to paste it directly into your code, or Download .json to save the file.

CSV vs JSON — what's the difference?

CSV (Comma-Separated Values) is a plain-text format where each row is a record and columns are separated by commas. It's compact, universally supported by spreadsheet apps, and easy for humans to read. But it has no concept of data types — everything is a string.

JSON preserves types (numbers, booleans, nulls), supports nested structures, and is natively parsed by every modern programming language. It's the right format when your data needs to interoperate with code.

Other tools

CSV to Excel — convert .csv to .xlsx spreadsheet
JSON to CSV — convert a JSON array back to CSV

Frequently asked questions

How it Works

When enabled (default), the first row of your CSV is used as the property names in the JSON objects. Each subsequent row becomes one JSON object with those named fields. When disabled, rows are converted to arrays of values instead.

There is no hard limit. The converter runs in your browser, so the practical limit is your device's available memory. Files up to tens of megabytes convert instantly on modern hardware.

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