CSV to JSON Pro
Convert CSV rows into a JSON array of objects. Works entirely in your browser.
Processed locally in your browser — not uploaded to our servers.
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This tool requires a Pro plan.
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Common questions
Are my files uploaded to your servers?
No. CSV parsing and JSON conversion run entirely in your browser using native JavaScript. Your data is not sent to Filecraft servers.
Which plan is required?
CSV to JSON requires a Pro or higher plan.
How are CSV headers used?
The first row is always treated as column headers. Each subsequent row becomes a JSON object with headers as keys.
Are values converted to numbers or booleans?
No. All values are converted as strings. If you need typed values, you can post-process the JSON output.
What happens with duplicate header names?
If your CSV has duplicate column names, the last value for each duplicate header is used in the JSON object. This is deterministic — the same input always produces the same output.
Is there a size limit?
Pasted text is limited to approximately 5 million characters. For very large files, conversion may be slow depending on your browser. This tool is designed for normal data conversion, not spreadsheet-scale workloads.