Developer Essentials · Free Tool

CSV ↔ JSON

Convert CSV to JSON and back — with configurable delimiter and header row — entirely in your browser. Nothing is uploaded.

Delimiter

First row is header

Input

Output

How it works

Going CSV → JSON, the first row becomes object keys and each following row an object (values are auto-typed to numbers/booleans where obvious). The parser follows RFC 4180 — quoted fields may contain commas, newlines and escaped quotes. JSON → CSV flattens an array of objects into rows, quoting any value that needs it. Everything runs locally.