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FormData to JSON Converter - Online Debug Multipart

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FormData to JSON Converter

Debug multipart/form-data payloads instantly. Build a form, upload files, or paste raw multipart data for a clean JSON representation.

Input FormData Builder
Output JSON Debug View
// Your JSON will appear here...

Frequently Asked Questions

FormData is a web API to construct a set of key/value pairs representing form fields and their values. When submitted, the browser encodes it as multipart/form-data—a format ideal for sending both text and binary files to a server.

Debugging raw multipart payloads is notoriously difficult because the boundary strings and mixed content types clutter the data. Converting to JSON provides a clean, hierarchical view of all fields and file metadata (name, size, type), making it much easier to verify your request payload.

Files are represented as objects containing metadata: fileName, fileSize (in bytes), and fileType (MIME type). Additionally, a Base64 truncated preview is provided for text-based files. Binary files are marked as [Binary data] to prevent corruption.

Yes. In the "Paste Raw Multipart" tab, you can paste the entire raw request body. The tool will automatically detect the boundary, parse the content, and present a clean JSON object. It handles standard line breaks and encoded characters.

Yes! After conversion, you'll see an auto-generated cURL command that replicates the FormData request. It includes proper -F flags for text fields and file uploads. You can copy it directly to your terminal.

Absolutely. The entire conversion happens locally in your browser using JavaScript. No files or form data are ever uploaded to a server. Your sensitive data remains completely private on your machine.
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