CSV to JSON Converter
CSV to JSON converter free — convert CSV to JSON or JSON to CSV in one click. Paste or upload data, get the converted output, copy or download. No server upload.
This free CSV to JSON converter lets you convert CSV data to JSON format or JSON back to CSV instantly in your browser. Paste your data directly or upload a file, and the converted output appears immediately. Copy the result or download it as a file — no server upload, no signup required.
CSV (comma-separated values) and JSON (JavaScript Object Notation) are the two most common formats for structured data exchange. CSV is the default export from spreadsheets and databases, while JSON is what most APIs and web applications consume. Converting between them is a routine developer and analyst task that should not require an internet-connected tool or a coding environment.
When converting CSV to JSON, the first row of the CSV is treated as the header row and becomes the keys in each JSON object. Each subsequent row becomes a JSON object in the output array. The converter handles quoted fields, commas inside values, and common CSV edge cases automatically.
When converting JSON to CSV, the keys from the first object in a JSON array become the CSV header row. All objects in the array must have the same keys. If objects have different structures, the output may be incomplete — make sure your JSON is an array of consistently structured objects before converting.
The tool processes all data client-side, meaning nothing is transmitted to any server. This makes it safe to use with internal data, API responses, or any sensitive structured data you would not want to upload to a third-party tool.
Frequently Asked Questions
- How do I convert CSV to JSON for free?
Paste your CSV data into the input field or upload a CSV file, and the JSON output appears immediately. Copy the JSON or download it as a file. No signup, no server upload — everything runs in your browser.
- Is there a free CSV to JSON converter online?
Yes. This CSV to JSON converter is completely free and runs entirely in your browser. Paste or upload CSV data to get JSON output instantly. No account or download required.
- Can I convert JSON back to CSV?
Yes. Switch the direction to JSON → CSV, paste your JSON array of objects, and the tool generates a CSV file with the JSON keys as headers. Download or copy the result directly.
- What if my CSV has commas inside field values?
The converter handles standard CSV quoting — if a field value contains a comma, it should be wrapped in double quotes in the CSV (which most spreadsheet exports do automatically). The converter parses quoted fields correctly.
- What JSON structure does the CSV converter output?
The output is a JSON array of objects. Each object represents one row of the CSV, with the column headers as keys. For example, a CSV with headers
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