CSV to JSON Converter

What is csv to json converter?

CSV is the plain format that spreadsheets export, and JSON is the format that web apps and APIs read. Converting between them is a daily task for developers, analysts and marketers.

This converter reads the first row as field names and turns every other row into an object. It follows standard CSV rules for quotes, so a comma inside quotes stays part of the value.

How to use the csv to json converter

1. Paste your CSV with a header row.
2. Choose the separator and whether to convert numbers.
3. Copy the JSON.

How the csv to json converter works

The text is parsed character by character. Quotes group a value, doubled quotes become one quote, and separators split fields. Row one provides the keys for every following row.

Worked example

Common uses of the csv to json converter

• Preparing data for an API.
• Loading spreadsheet rows into a web app.
• Creating test fixtures.
• Moving data between tools.
• Checking an export for errors.

Tips and common mistakes

Make sure every column has a unique header name.

Turn off number conversion if values such as phone numbers or ZIP codes must keep leading zeros.

Background: what to know before you rely on it

CSV looks simple but has many small traps. Fields may contain commas, quotes or line breaks, and different programs use different separators, such as semicolons in regions where the comma is the decimal mark. A reliable converter follows the quoting rules instead of splitting on every comma. JSON then adds types: numbers, text, true and false, and nested values. Deciding which CSV values should become numbers is a choice, which is why this tool lets you turn it off.

Private, free and fast

This tool runs entirely in your browser. What you type or choose is not uploaded to a server and is not saved after you close the page, which keeps it fast and private. It is free to use as often as you like. See more in all converters, or browse the full list of tools.

Related tools

Results are for information and education. For legal, financial, medical or security decisions, check with a qualified professional. Check critical conversions with an official source.