ToolsForNerds

Multipart To JSON

Parse multipart/form-data HTTP payloads into readable JSON format

How to Get Multipart Data

From Browser DevTools:
  1. Open DevTools (F12) and go to Network tab
  2. Submit a form with file upload or multipart data
  3. Click on the request in the Network panel
  4. Go to the "Payload" or "Request" tab
  5. Copy the raw request body
  6. Paste it here to parse
Example format:
------WebKitFormBoundary...
Content-Disposition: form-data; name="field"

value
------WebKitFormBoundary...--

About the Multipart Form Data Parser

Parse and convert multipart/form-data payloads from HTTP requests into readable JSON format. Essential for debugging file uploads, form submissions, and API requests that use multipart encoding.

Features:

  • Automatically detect boundary strings
  • Parse all form fields and values
  • Extract file upload metadata (filename, content-type)
  • Handle binary data indicators
  • Pretty-printed JSON output
  • Copy to clipboard functionality

What It Parses:

  • Form field names and values
  • File upload information (name, filename, content-type)
  • Content-Disposition headers
  • Boundary separators
  • Multiple fields in one payload

Use Cases:

  • Debugging file upload APIs
  • Analyzing form submission data
  • Understanding multipart request structure
  • API testing and development
  • Learning HTTP multipart format
  • Inspecting network request payloads