CSV to JSON Converter
CSV to JSON Converter helps developers turn spreadsheet-style CSV data into JSON for APIs, imports, fixtures and debugging workflows.
Convert CSV to JSON with delimiter options, type detection, row validation, preview table, copy and download support.
Validation
CSV Preview
JSON Output
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What is a CSV to JSON converter?
A CSV to JSON converter transforms comma-separated values into JavaScript Object Notation. CSV is useful for spreadsheets, exports and simple tabular data. JSON is more common in APIs, configuration files, frontend applications and test fixtures.
When to use this tool
Use this converter when you need to turn spreadsheet data into an API payload, create mock data for tests, convert exported reports into structured JSON, or inspect how rows and columns will map into objects.
CSV input example
name,age,active Dale,35,true Sam,29,false
JSON output example
[
{
"name": "Dale",
"age": 35,
"active": true
},
{
"name": "Sam",
"age": 29,
"active": false
}
]
Common CSV parsing errors
- Rows with more or fewer columns than the header row.
- Unclosed quoted values.
- Using semicolons or tabs while expecting commas.
- Duplicate or empty column names.
- Values that look numeric but should remain strings, such as product codes.
Frequently asked questions
Does this support quoted CSV values?
Yes. The parser supports quoted fields, commas inside quotes and escaped quotes using the standard double-quote format.
Can I download the JSON?
Yes. After converting the CSV, use the Download JSON button to save the output as a .json file.
Does the CSV leave my browser?
This static tool processes the input locally in your browser. The file input reads your CSV into the page so it can be converted client-side.