Data Tools
CSV to JSON & JSON to CSV Converter
Convert pasted data or files between CSV and JSON, then copy or download the result. Conversion happens locally in your browser without uploading the source data.
Convert CSV to JSON Online
Turn spreadsheet exports, database extracts, contact lists, and other tabular data into structured JSON. With headers enabled, the first CSV row becomes property names; without headers, rows become JSON arrays. Properly quoted commas, escaped quotation marks, and multiline fields are supported.
Convert JSON to CSV Online
Convert an array of flat JSON objects into CSV for spreadsheets, imports, and reporting. The converter creates columns from all properties found across the objects. Missing properties become blank cells, while text, numbers, booleans, and null values are handled as flat values.
How to Use the Converter
- Select CSV → JSON or JSON → CSV.
- Paste data or choose a matching .csv or .json file.
- Set the available parsing options, convert, then copy or download the output.
Format Limits and Local Processing
Selected files are limited to 5 MB to protect browser responsiveness. JSON-to-CSV conversion requires an array of flat objects; nested objects and arrays are detected but not flattened. Files and pasted values are processed on your device and are not uploaded.