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Free tools

CSV to JSON Converter

Convert CSV data to JSON in your browser.

Runs locally · nothing is uploaded 

JSON appears here…

Features

Delimiter found for you

Comma, semicolon or tab: the converter spots the one your file uses, European Excel exports included.

Quotes done right

Fields with commas, line breaks or doubled quotes inside them come through intact.

Nothing uploaded

The file is parsed in your browser, so customer lists and exports never leave your device.

How to use

  1. 1 Paste your CSV into the input box.
  2. 2 Keep "First row is the header" on to get objects keyed by column name, or turn it off for plain arrays.
  3. 3 Click Convert and copy the JSON.

Common use cases

  • Turning a spreadsheet export into data for an app or a test
  • Preparing fixtures and seed data for development
  • Feeding a contact list to a tool that only reads JSON
  • Checking how a CSV really splits into columns before an import
  • Converting semicolon CSVs from European Excel without editing them

About this tool

CSV is how spreadsheets and databases export tables; JSON is what most apps and APIs read. This converter bridges the two: each row becomes an object whose keys are the column names, ready to paste into code, a test or an import screen.

It follows the CSV rules that trip simpler converters: quoted fields may contain the delimiter, line breaks and escaped quotes, and files saved with semicolons or tabs work as well as comma-separated ones.

This tool is built by ToolClack and, like everything we make, it is local-first: your data stays in your browser.

Frequently asked questions

Is my data uploaded anywhere?

No. The CSV is parsed by your browser; nothing is sent to a server.

Which delimiters are supported?

Comma, semicolon and tab. The converter detects which one your data uses, so you do not have to choose.

What if my file has no header row?

Turn off "First row is the header": every row then becomes an array of values instead of an object.

Are numbers converted?

No, every value stays text exactly as it was in the CSV, so leading zeros in codes and phone numbers are never lost.

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