Convert CSV to JSON

How it works

Converting CSV to JSON is a two-step process that runs entirely in your browser. First, your CSV is parsed into a plain in-memory data structure. CSV rows become objects keyed by the header row. Nested values are flattened into dot-separated columns such as database.host and rebuilt on the way back; numbers and booleans are detected, while values with leading zeros stay text. Second, that structure is serialized as JSON with consistent indentation, ready to paste into configs, APIs or scripts. JSON maps directly onto objects, arrays, strings, numbers, booleans and null, so it is the most faithful intermediate shape. Because both steps are local JavaScript, sensitive payloads such as customer exports, infrastructure manifests and credentials files never travel to a server, and conversion keeps working on a flaky connection once the page has loaded. The output updates as you type, and invalid input is reported with the parser’s own error message so you can find the problem quickly. Spot-check important conversions, especially when your data mixes numbers that look like text, empty values and deeply nested arrays.

Frequently asked questions