CSV ↔ JSON Converter

Paste CSV to get JSON, or paste a JSON array to get CSV. Quoted fields and custom delimiters are handled.

Free · Runs in your browser · Your text is never uploaded

A table of rows and columns converted to JSON braces and back

CSV to JSON

Each row becomes an object whose keys come from the header row. Fields wrapped in double quotes can contain commas and line breaks, and a doubled quote ("") stands for one quote character. With “Convert numbers and true/false” on, values like 34 and true become real JSON numbers and booleans; turn it off to keep everything as strings (useful for ZIP codes and IDs with leading zeros).

JSON to CSV

Paste an array of objects. The header is the union of all keys, and missing values are left empty. Nested objects and arrays are written as JSON text inside the cell. An array of arrays is also accepted.

For European spreadsheets that use semicolons, pick the semicolon delimiter. Everything stays in your browser.

Popular csv ↔ json converter presets

Frequently asked questions

How do I convert CSV to JSON?

Paste the CSV, keep “CSV to JSON” selected and copy the result. The first row is used for property names.

How are commas inside values handled?

Wrap the value in double quotes, as in standard CSV. The converter reads and writes quoted fields correctly.

Why did my ZIP codes lose leading zeros?

Number conversion turned them into numbers. Untick “Convert numbers and true/false” to keep text as-is.

Can I convert nested JSON to CSV?

Nested values are written as JSON text in a single cell. Flatten the data first for one column per nested key.

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