What is the difference between "array of objects" and "array of arrays" output?

When "First row is header" is enabled, each data row becomes a JSON object whose keys are the column names from the first row, giving you an array of objects. When the toggle is off, every row (including the first) is converted to a plain array of values, giving you a nested array.

How does the parser handle quoted fields that contain commas or line breaks?

The converter uses a full RFC 4180 parser. A field enclosed in double quotes may contain the delimiter character, newline characters, or even embedded double quotes (written as two consecutive double quotes ""). All of these are handled correctly without any extra configuration.

What does "Parse numbers/booleans" do?

With this option on, field values that look like integers or decimals are converted to JSON numbers, and the strings "true" and "false" (case-insensitive) are converted to JSON booleans. Values that do not match those patterns remain strings. Turn the option off to keep everything as strings.

Which delimiters are supported?

Auto mode detects comma, semicolon, tab, and pipe by counting occurrences in the first row. You can also force a specific delimiter from the dropdown. The RFC 4180 quoting rules apply regardless of which delimiter is selected.

Is my data sent to a server?

No. All parsing happens entirely in your browser using JavaScript. Your CSV data never leaves your device, which makes this tool safe for sensitive or proprietary files.

What file size can I convert?

Because parsing runs in-browser there is no server-side file size limit. In practice, files up to a few megabytes convert in well under a second. Very large files (tens of megabytes) may take a few seconds depending on your device.

CSV to JSON Converter

Name: CSV to JSON Converter
Availability: InStock
Author: Nham Vu

Paste or upload a CSV file and convert it to formatted JSON instantly — handles quoted fields, escaped quotes, and mixed line endings in your browser.

CSV Input

Load File

Options

Delimiter

First row is header (produces array of objects) Trim whitespace Parse numbers & booleans

JSON Output

Paste CSV above and click Convert.

A sample CSV has been pre-loaded so you can try it right away.

Copied!

Summary