CSV to JSON — How to Convert CSV Data
Learn how CSV data maps to JSON format with practical examples. Convert CSV files instantly with our CSV to JSON Converter.
Basic CSV to JSON Mapping
CSV headers become JSON keys, rows become objects in an array.
name,email,age John,john@example.com,30 Jane,jane@example.com,28
[
{
"name": "John",
"email": "john@example.com",
"age": 30
},
{
"name": "Jane",
"email": "jane@example.com",
"age": 28
}
]Handling Quoted Fields
CSV values containing commas, newlines, or quotes must be quoted.
id,description 1,"Item with, comma" 2,"Multi-line description"
[
{
"id": 1,
"description": "Item with, comma"
},
{
"id": 2,
"description": "Multi-line\ndescription"
}
]Type Inference
| CSV Value | JSON Type | Notes |
|---|---|---|
| "hello" | "hello" (string) | Quoted values are always strings |
| 42 | 42 (number) | Unquoted numeric becomes number |
| 3.14 | 3.14 (number) | Floats are preserved |
| true | true (boolean) | Lowercase true/false |
| NULL | null | Case-insensitive null |
| "42" | "42" (string) | Quoted numbers stay strings |
| 2026-01-01 | "2026-01-01" (string) | Dates stay as strings (no auto-date) |
Common Use Cases for CSV to JSON Conversion
Frequently Asked Questions
How does CSV to JSON conversion work?
CSV headers become JSON object keys, and each data row becomes a JSON object in an array. The first row of your CSV file is used as the field names, and each subsequent row is mapped to key-value pairs.
What happens to quoted fields in CSV?
Quoted fields in CSV preserve their content exactly, including commas and newlines within the value. Quoted numeric values remain as strings in JSON — they are not converted to numbers.
How are data types inferred during conversion?
Unquoted numeric values like 42 or 3.14 become JSON numbers. The lowercase values true and false become booleans. NULL becomes null. Everything else, including quoted values, remains a string.
Can I convert CSV with nested data to JSON?
Standard CSV cannot represent nested objects or arrays. For flat data structures, the conversion is straightforward. For nested data, you would need a format like JSON directly.
Does our CSV to JSON converter run server-side?
No. All conversion happens locally in your browser. Your CSV data never leaves your device.