Convert CSV to JSON Online — Free
Runs 100% in your browser — your files never leave your device.
APIs speak JSON; spreadsheets export CSV — the handoff is constant. Paste your CSV and get a clean JSON array where the header row becomes the keys of every record. Quoted fields, embedded commas, and multi-line cells are parsed by the book (RFC 4180), and the conversion runs entirely in your browser.
How it works
- 1
Paste your CSV
The first row is read as the header; every row after becomes one object.
- 2
Read the JSON
The result appears live as you paste — errors explain themselves inline.
- 3
Copy or download
One click copies the JSON; another saves it as a file.
About this tool
How the conversion works
The tool parses your CSV with a standards-compliant parser — quoted fields, escaped quotes, and embedded commas and line breaks all handled per the CSV specification — and maps each row onto a JSON object using the header row as keys. The output is a JSON array, one object per row.
The header row decides everything
The first row becomes the property names of every JSON object, so a clean, unique header produces clean JSON. Duplicate or empty headers surface as collisions — fix the header before converting, and the data takes care of itself.
Types and nesting
CSV is plain text, so the output values are strings unless you post-process — "42" arrives as the string "42". For most pipelines that is correct behavior; convert downstream where types are known rather than guessing here.
Frequently asked questions
What about commas inside my data?
Fields wrapped in double quotes may contain commas, quotes (doubled), and line breaks — the parser follows the CSV spec, so properly quoted data converts correctly.
Does it handle files with semicolon or tab delimiters?
This tool expects standard comma-separated input. Replace the delimiter first, or paste tab-separated data into a converter that expects it.
Is my data uploaded anywhere?
No — parsing and conversion run entirely in your browser. Customer data and exports never leave your device.