How to Use CSV to JSON

Key Takeaways

Comma, semicolon, tab, and pipe (|)

Type inference converts string values to their appropriate types: '42' becomes 42 (number), 'true' becomes true (boolean), '' becomes null

Toggle 'No header row' and the tool generates keys as col1, col2, col3, etc

Array of objects (most common), array of arrays, or a keyed object where each key is the value of a specific column

What is CSV to JSON?

CSV to JSON converts comma-separated values data into structured JSON, automatically detecting delimiters, inferring data types, and supporting multiple output formats. It’s the bridge between spreadsheet exports and API/code consumption.

Your data is processed entirely in the browser — no CSV content is uploaded to any server at any point.

Output Modes

Array of Objects

Each row becomes an object with header keys. The most common JSON structure for APIs and databases.

Array of Arrays

Each row becomes an array. More compact — useful when column order is fixed and key names aren't needed.

Keyed Object

One column becomes the key for a parent object. Useful for lookup tables where a unique ID maps to row data.

Paste CSV

Paste raw CSV text or upload a .csv file. Headers are read from the first row by default.

Set delimiter

Auto-detection handles most cases. Override manually if the detected delimiter is wrong.

Choose output

Select array of objects, array of arrays, or keyed object mode.

Toggle type inference

On by default — converts numeric strings to numbers and 'true'/'false' to booleans.

Copy JSON

Click Copy to grab the formatted JSON output.

Example Conversion

Input CSV:

name,age,active
Alice,28,true
Bob,34,false

Output JSON (array of objects):

[
  { "name": "Alice", "age": 28, "active": true },
  { "name": "Bob",   "age": 34, "active": false }
]

With type inference on: 28 is a number, true is a boolean — not strings.

Tips & Common Mistakes

Fields with commas need quotes. If a CSV field contains a comma (e.g. “Smith, John”), it must be wrapped in double quotes in the CSV: "Smith, John". The parser handles this correctly.

Watch for BOM characters. CSV files from Excel sometimes start with a byte-order mark (BOM). If the first key in your JSON looks like name, enable ‘Strip BOM’ in the options.

JSON to CSV — reverse conversion
JSON Formatter — beautify and validate JSON output
JSON Validator — check output structure

Frequently Asked Questions

What delimiters are supported?

Comma, semicolon, tab, and pipe (|). The tool auto-detects the delimiter from your data, but you can override it manually.

What is type inference?

Type inference converts string values to their appropriate types: '42' becomes 42 (number), 'true' becomes true (boolean), '' becomes null. Toggle it off to keep everything as strings.

What if my CSV has no header row?

Toggle 'No header row' and the tool generates keys as col1, col2, col3, etc. You can rename them in the output.

What output formats are available?

Array of objects (most common), array of arrays, or a keyed object where each key is the value of a specific column.

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