Do quoted commas work?

Yes. RFC 4180 quotes and doubled quotes inside a field are parsed.

What does type inference do?

true/false become booleans, null becomes null, and plain integers or decimals become numbers. Everything else stays a string.

Set the delimiter to Tab for TSV exports from Excel or BigQuery.

Are headers required?

This page assumes a header row. Empty headers become column_1, column_2, and so on.

Will dotted headers nest objects?

Not yet. user.name stays a flat key. Nesting is the reverse of flatten and ships later if people ask.

Runs in your browser · Last updated 4 September 2026

CSV to JSON Converter

Turn a CSV or TSV table into JSON objects. Header row, type inference, RFC 4180 quotes. Stays on your device.

Infer numbers and booleansDelimiter

CSV

JSON

[
  {
    "id": 1,
    "user.name": "Ada",
    "user.city": "London",
    "tags.0": "math",
    "tags.1": "engine"
  },
  {
    "id": 2,
    "user.name": "Grace",
    "user.city": "New York",
    "tags.0": "navy",
    "tags.1": ""
  }
]

How to use this tool

Paste CSV with a header row.
Pick comma, tab, or pipe.
Keep type inference on unless you need every cell as a string.
Copy the JSON array.

Worked example

The sample header id,user.name,user.city becomes two objects with those exact keys. id is a number when inference is on.

Frequently asked questions

Do quoted commas work?: Yes. RFC 4180 quotes and doubled quotes inside a field are parsed.
What does type inference do?: true/false become booleans, null becomes null, and plain integers or decimals become numbers. Everything else stays a string.
Can I use tabs?: Set the delimiter to Tab for TSV exports from Excel or BigQuery.
Are headers required?: This page assumes a header row. Empty headers become column_1, column_2, and so on.
Will dotted headers nest objects?: Not yet. user.name stays a flat key. Nesting is the reverse of flatten and ships later if people ask.