CSV and JSON Converter

Convert CSV to JSON or JSON to CSV online with delimiter and header options — free.

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About

About the CSV and JSON Converter

Converts pasted CSV rows into JSON records, or JSON records back into CSV, with control over the delimiter, header row and number parsing.

Developers use it to turn a spreadsheet export into JSON test data, while data analysts use it to reshape an API response into CSV. It's one of many free data tools on Toolapt, and like every tool here, it's free to use with no sign-up and no limit on how many times you run it.

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Guide

Using the CSV and JSON Converter

  1. 1

    Step 1

    Paste your CSV or JSON into the Input box.

  2. 2

    Step 2

    Choose the direction — CSV to JSON or JSON to CSV.

  3. 3

    Step 3

    Set the delimiter, header and number options to match your data.

  4. 4

    Step 4

    Click "Convert" and copy the result.

  • Converts in both directions — CSV to JSON and JSON back to CSV
  • Auto-detects the delimiter, or lets you set it manually (comma, semicolon, tab or pipe)
  • Optionally converts numeric-looking values into real JSON numbers
  • Lets you choose 2-space or minified JSON output
  • Works entirely in your browser — no installs and no sign-up
  • Free to use, with no limit on how many times you run it
  • Fully responsive, so it works just as well on a phone as on a desktop

Developers

Developers use the CSV and JSON Converter for quickly turning a spreadsheet export into JSON test data.

Data analysts

Data analysts use the CSV and JSON Converter for reshaping an API's JSON response into a CSV they can open in a spreadsheet.

QA engineers

QA engineers use the CSV and JSON Converter for building sample records to feed into a test.

Students

Students use the CSV and JSON Converter for seeing how tabular data maps onto JSON's key-value structure.

Examples

CSV and JSON Converter examples

2 worked examples

01

CSV to JSON

"name,age\nAlice,30" converts to [{"name":"Alice","age":30}].

02

JSON to CSV

[{"name":"Bob","age":25}] converts to "name,age\nBob,25".

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FAQ

Frequently asked questions

Quick answers to common questions about the CSV and JSON Converter.

What does the CSV and JSON Converter do?

It converts pasted CSV rows into JSON records, or JSON records back into CSV, with control over delimiter and formatting.

Is the CSV and JSON Converter free to use?

Yes. It's free, with no sign-up, no watermark and no limit on how many times you use it.

Is my input safe when I use this tool?

Yes. Your data is processed entirely on your own device — nothing is sent to a server.

What delimiters does it support?

Comma, semicolon, tab and pipe, plus automatic detection if you're not sure which one your file uses.

What does "First row contains column names" do?

When turned on, the first CSV row is treated as field names for the resulting JSON objects rather than as a data row itself.

Will numbers stay as numbers in the JSON?

Only if "Convert numeric values to numbers" is turned on — otherwise every CSV value is kept as a JSON string.

Can I use the CSV and JSON Converter on my phone?

Yes. The page is fully responsive and works on mobile, tablet and desktop browsers alike.

Does the CSV and JSON Converter have any limitations?

It's built for well-formed, everyday CSV/JSON; deeply nested JSON objects don't have a single obvious CSV shape, so converting JSON to CSV works best with flat records.

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