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CSV to JSON Converter

Convert CSV to JSON with automatic header and delimiter handling

Runs in your browserUtility02 — Converters

What is CSV to JSON Converter?

A CSV to JSON converter parses tabular data into an array of objects, optionally using the first row as field names, and handles comma, semicolon, and tab delimiters as well as quoted fields. Parsing runs inside the browser, so your spreadsheet data is never uploaded.

How to use CSV to JSON Converter

  1. 1Paste CSV text, or copy cells straight out of your spreadsheet app.
  2. 2Confirm that the delimiter and the "first row is a header" switch are set correctly.
  3. 3Review the JSON array in the output — one object per row.
  4. 4Use the JSON to CSV tool when you need the opposite direction.

How do I do this in code?

Use the tool above for one-off work; for anything you repeat, move it into a script or your project.

import Papa from 'papaparse';

const { data, errors } = Papa.parse(csv, {
  header: true,
  skipEmptyLines: true,
  dynamicTyping: false,
});

Common errors and how to fix them

SymptomCauseFix
A comma inside a value splits one column into twoThat field is not wrapped in double quotes, so the parser cannot tell a literal comma from a delimiter.Quote any field that contains the delimiter when you export the CSV, and double up any quote characters inside a field.
Leading zeros are lost (007 becomes 7)Automatic type inference is enabled and treats the string as a number.Turn type inference off so every value stays a string, then cast the values you need in your own code.

Frequently asked questions

Is it safe to paste a spreadsheet that contains personal data such as phone numbers?+

Yes. Parsing happens entirely inside your browser, the page has no upload endpoint, and the data is gone the moment you close the tab. If you would rather see that for yourself, open the Network panel in DevTools and confirm that no request carries your table contents while you convert.

Why is content copied from Excel separated by tabs instead of commas?+

Cells copied directly out of Excel, Google Sheets, or Numbers land on the clipboard as tab-separated plain text. Set the delimiter to "Tab" and it parses correctly — there is no need to save the sheet as a CSV file first.

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