Developer & data

CSV ↔ JSON converter

Convert comma-separated tables with headers and flat JSON object arrays.

Runs in your browser · No file or text uploads

Preparing your tool…

ABOUT THIS TOOL

What CSV ↔ JSON converter helps you do

Move a spreadsheet export into an API-friendly array or turn flat JSON records into a CSV file.

How to use it

Choose CSV to JSON or JSON to CSV.
Paste a header-based CSV table or an array of objects.
Review formula protection and convert the data.

Input and output example

INPUT

Name,Code
Alex,0012

OUTPUT

[
  {"Name":"Alex","Code":"0012"}
]

Supported formats and limits

Maximum input: 1 MiB, 10,000 data rows and 200 columns. CSV uses commas.
Empty or duplicate headers, mismatched column counts and nested object values are rejected.
JSON null, missing values and empty strings all become empty CSV cells and cannot be distinguished on a round trip.

How the result is calculated

Papa Parse handles quoted commas, quotes and cell line breaks. CSV cells become strings, preserving leading zeros. CSV formula protection prefixes an apostrophe to values beginning with = + - @ and related control characters; this intentionally changes those values.

Frequently asked questions

Will 0012 become 12?

CSV to JSON keeps every cell as a string. When opening the result in a spreadsheet, choose text import settings to prevent the spreadsheet from reinterpreting it.

Why offer formula protection?

Spreadsheet programs may execute certain cells as formulas. Disable protection only if exact values are needed and you will import them safely as text.