CSV to JSON Converter

What is a CSV to JSON Converter?

A CSV to JSON converter transforms tabular data from comma-separated values format into JSON (JavaScript Object Notation). JSON is the standard data format used by REST APIs, web applications, databases like MongoDB, and data pipelines. Converting CSV exports from Excel, Google Sheets, or database tools to JSON makes the data directly usable in code.

Calcon's CSV to JSON Converter automatically detects your delimiter, converts data types (numbers stay as numbers), and handles quoted fields with embedded commas or newlines — all in your browser without any server upload.

How to Convert CSV to JSON

1. Paste your CSV into the left panel or click Upload to upload a.csv or .tsv file.
2. The JSON output appears instantly. The delimiter is auto-detected from your data.
3. Adjust options: toggle First row is headers, Detect types, and Pretty print.
4. Choose output format: Array of objects (default) orObject with key for lookup tables.
5. Click Download to save the .json file orCopy to copy to clipboard.

Example Conversion

Input CSV:

name,age,city,active
Alice,30,Mumbai,true
Bob,25,Delhi,false
Carol,35,Bangalore,true

Output JSON (with type detection):

[
  { "name": "Alice", "age": 30, "city": "Mumbai", "active": true },
  { "name": "Bob",   "age": 25, "city": "Delhi",  "active": false },
  { "name": "Carol", "age": 35, "city": "Bangalore", "active": true }
]