CSV to JSON Converter

Runs entirely in your browser - no upload, no sign-up.

CSV input

JSON output

Paste CSV to convert it to JSON.

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How do you convert CSV to JSON?

A CSV to JSON converter reads tabular rows and creates structured JSON. Paste CSV here and the header row becomes object keys while each later row becomes an object. The converter handles quoted commas, escaped quotes and multiline fields, then gives you formatted JSON to copy or download.

How to use

1Paste your CSV. Enter CSV in the left panel or load the example to see a correctly quoted file.
2Choose the structure. Keep the first row as headers for JSON objects, select a delimiter if auto-detect is not right, and optionally detect JSON types.
3Use the JSON. Review the live formatted output, then copy it or download data.json.

Who it's for

Developers creating API fixtures, seed records or test data from spreadsheet exports.
Data teams moving flat reports into scripts, notebooks and pipelines that accept JSON.
Analysts checking a CSV structure before importing records into an application or database.

CSV stores a table as delimited text, while JSON stores data as arrays and objects that applications can consume directly. This converter supports comma, semicolon, tab and pipe delimiters. Turn off the header option for an array of arrays, or enable type detection when you want safe numbers, booleans, nulls and empty cells represented as JSON primitives.

Conversion runs locally in your browser. Your spreadsheet exports, fixtures and customer data are not uploaded or sent to a conversion service.

FAQ

Is this CSV to JSON converter free?

Yes. You can convert CSV to JSON without signing up, installing software or paying for a plan. The conversion runs in your browser and the result can be copied or downloaded as a JSON file.

Is my CSV uploaded anywhere?

No. The converter processes the text locally in your browser. Your CSV and generated JSON are not sent to a server, which makes the tool suitable for private exports and development data.

Does it handle commas and line breaks inside quoted fields?

Yes. Double-quoted fields can contain the selected delimiter and line breaks. Two consecutive double quotes inside a quoted value become one literal quote, following the common RFC 4180 CSV convention.

What happens if the CSV has no header row?

Turn off the first-row header option. The converter will produce a JSON array of arrays, so every CSV row remains a row and no values are treated as object keys.

Can it convert semicolon, tab or pipe-separated data?

Yes. Auto-detect checks the first complete record for comma, semicolon, tab and pipe separators. You can also choose a delimiter manually when a file is unusual or detection is ambiguous.

How does JSON type detection work?

When enabled, unquoted true, false and null values become JSON primitives, empty cells become null, and safe canonical numbers become JSON numbers. Quoted values, leading-zero IDs and values that could lose precision remain strings.