Convert CSV to JSON Online

Convert CSV to JSON.

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How to use

Paste or type your input in the left editor
Adjust options in the toolbar if available
Copy or download the output from the right pane

This free online tool runs entirely in your browser. No sign‑up, no server uploads.

About CSV to JSON Converter

Convert CSV to JSON.

The CSV to JSON converter parses the input using an RFC 4180-compliant parser that handles quoted fields, escaped quotes, and embedded newlines. The first row is extracted as column headers to define the JSON object keys. Each subsequent row is converted to a JSON object by mapping cell values to their corresponding header keys, with automatic type detection for numbers and booleans. The result is a JSON array of objects.

Use the left editor to enter your data. The output updates in real time. You can copy, clear, download, or expand either pane.

Tip: Use the search bar to quickly switch between tools.

Sample CSV

name,age
Jane,29
John,31

Example input shown above. Output appears in the right pane instantly.

Why this tool?

Feature	CSV to JSON Converter	Typical alternatives
Free online tool	Yes	Often yes
Client‑side only (privacy)	Yes	Varies
No sign‑up required	Yes	Varies

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FAQs

How does the converter determine JSON keys from CSV data?

The first row of your CSV is treated as the header row, and each column header becomes a JSON key. Subsequent rows become JSON objects with values mapped to those keys. This produces an array of objects that is easy to work with in JavaScript.

Can I convert CSV with custom delimiters like semicolons or tabs?

Yes. While comma is the default delimiter, the converter supports semicolons, tabs, pipes, and other custom delimiters. This handles regional CSV variations where semicolons are used instead of commas due to decimal comma conventions.

How are quoted fields and escaped characters handled?

The converter follows RFC 4180 for CSV parsing: fields enclosed in double quotes can contain commas, newlines, and literal double quotes (escaped as two consecutive double quotes). All quoting rules are handled automatically.

Does the converter detect and preserve data types?

The converter intelligently detects numeric values and converts them to JSON numbers rather than strings. Boolean-like values (true/false) and empty fields can also be typed correctly. Values that should remain as strings are preserved as-is.

Can I convert CSV exported from Excel to JSON?

Yes. CSV files exported from Microsoft Excel, Google Sheets, or LibreOffice Calc are fully supported. The converter handles Excel's quoting conventions and UTF-8 BOM markers that Excel sometimes adds to CSV exports.

What happens if rows have different numbers of columns?

Rows with fewer columns than the header get null values for the missing fields. Rows with extra columns beyond the header are captured with auto-generated keys. This ensures no data is silently dropped during conversion.