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CSV to JSON Converter

Turn a CSV export from Excel, Google Sheets or a database into a JSON array ready for code or an API.

Indent: Delimiter: Detect numbers and true/false Nest dotted column names Root element:

Input

Output

How to Use

Paste the CSV, or open a .csv or .tsv file. The first row must hold the column names.
The delimiter is detected automatically; choose one yourself if the result looks wrong.
Leave Detect numbers and true/false ticked to get real JSON numbers and booleans.
Copy the JSON array or download it as converted.json.

Frequently Asked Questions

Which delimiters are supported?

Comma, semicolon, tab and pipe. On Automatic, the first line is examined and the most frequent one outside quotes is used, so semicolon files from European Excel work without changes.

Why did 007 stay a string?

Turning it into a number would lose the leading zero, which matters for postal codes, IDs and phone numbers. Only values that read back exactly the same, such as 42 or 3.5, become numbers.

Can I get nested JSON from CSV?

Yes. Name columns with dots, such as address.city, and tick Nest dotted column names. Numeric parts such as tags.0 become arrays.

Is the CSV uploaded?

No. It is parsed in your browser, so exports with personal data stay on your device.

Convert CSV to JSON Online

Updated September 29, 2026 · By Saman

CSV is how spreadsheets and databases export data, and JSON is how programs and APIs want it. Converting by hand, or with a quick split on commas, breaks as soon as a field contains a comma, a quote or a line break. This page is the JSON Converter with CSV in and JSON out, using a full RFC 4180 parser.

Everything runs in the browser tab, so the file is never uploaded.

What the parser handles

Quoted fields with commas, semicolons and line breaks inside them.
Doubled quotes: "say ""hi""" becomes say "hi".
Excel byte-order marks, which would otherwise end up in the first column name.
Empty header cells, which are named column1, column2 and so on.
An unclosed quote, which is reported instead of silently swallowing the rest of the file.

Types in the output

CSV value	JSON with type detection	JSON without
`42`	`42`	`"42"`
`true`	`true`	`"true"`
`007`	`"007"`	`"007"`
`1.50`	`"1.50"`	`"1.50"`
empty	`""`	`""`

Rebuilding nested objects

A flat table can still describe nested data if the column names say where each value belongs. With Nest dotted column names ticked, a column called address.city becomes {"address": {"city": ...} }, which is exactly the reverse of JSON to CSV.

Next steps

To check the result or reformat it, open it in the JSON formatter. To turn the same data into YAML, choose YAML as the output format on the JSON Converter.