Convert between CSV and JSON instantly. Runs entirely in your browser.
This tool converts comma-separated values (CSV) into JSON format and back again. Paste your CSV data into the left panel, click the button, and get clean, formatted JSON on the right. You can also go the other direction — paste a JSON array of objects and convert it to CSV with headers derived from the object keys.
Real-world CSV files are rarely clean. Fields often contain commas, double quotes, and even line breaks within quoted values. This converter handles all of those cases correctly, following the RFC 4180 standard. Quoted fields are parsed properly, escaped double quotes ("") are unescaped, and newlines within quoted strings are preserved in the resulting JSON values.
The first row of your CSV is treated as column headers. Each subsequent row becomes a JSON object with those headers as keys. This is the most common format used by spreadsheets, databases, and data export tools. If your CSV has no header row, add one before converting.
Nothing is uploaded to any server. The conversion happens locally using JavaScript, so your data stays on your machine. This makes the tool suitable for sensitive or proprietary data that you would rather not send to a third-party service. There are no file size limits beyond what your browser can handle, and no account or sign-up is needed.
Developers frequently need to convert between CSV and JSON when working with APIs, configuration files, or data pipelines. Analysts use it to reshape exported spreadsheet data into a format that tools like D3.js or chart libraries expect. It is also useful for preparing seed data, writing tests, or quickly inspecting tabular data in a structured format.
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