CSV to JSON Converter
The CSV to JSON Converter transforms CSV (Comma-Separated Values) data into structured JSON format. CSV is great for spreadsheets, but JSON is better for APIs, web applications, and programmatic data processing. This converter automatically detects column headers from the first row, parses each subsequent row as a data object, and handles quoted values, commas within fields, and various delimiters. It is ideal for importing spreadsheet data into web apps or preparing data for API consumption.
Formula
Conversion logic:
1. First row = column headers (keys)
2. Each subsequent row = one JSON object
3. Values are typed: numbers, booleans, null detected
4. Quoted fields preserve commas and newlines
5. Output: array of objects
[{"col1": val1, "col2": val2}, ...] Example
Input CSV: name,age,active Alice,30,true Bob,25,false Output JSON: [ {"name": "Alice", "age": 30, "active": true}, {"name": "Bob", "age": 25, "active": false} ]
How to Use
- Paste your CSV data into the input field
- Specify the delimiter if not comma
- Choose whether the first row contains headers
- Click convert to generate JSON
- Copy or download the JSON output
Frequently Asked Questions
Does the converter detect data types?
Yes, the converter attempts to parse values as numbers, booleans (true/false), and null. Strings that look like numbers are converted to numbers. If you want all values as strings, disable type detection.
What delimiter is supported?
Comma (,) is the default. Some CSV files use semicolons (;) or tabs. The converter can auto-detect the delimiter or you can specify it manually. TSV (tab-separated) files are also supported.
How are quoted fields handled?
Fields wrapped in double quotes are treated literally — commas and newlines inside quotes are preserved. This follows RFC 4180. For example, "Hello, World" is parsed as a single field, not two fields.
Can I convert CSV without headers?
Yes, if your CSV has no header row, the converter can use generic keys like 'col1', 'col2', etc. Or you can provide custom column names. Most CSV files include headers in the first row.
What happens with empty CSV cells?
Empty cells are converted to empty strings by default. You can configure the converter to use null instead. This is useful when you need to distinguish between empty strings and missing values in your JSON output.