What do we send from the frontend?

Logic, data for processing, files, user information, their actions, and session state.

Specific examples of data sent:

• Form data: User input in text fields, selection from lists, checkboxes.
• Request parameters: Object identifiers, filters, sorting, page numbers (for pagination).
• HTTP headers: Browser information, content type, authorization tokens.
• Request body: Usually a JSON object for data, files for upload.
• UI states: For example, active tabs, selected elements.
• User events: Clicks, cursor hover, scrolling.

Example of sending form data in JSON format:

{
  "username": "testuser",
  "email": "test@example.com",
  "password": "securepassword123"
}

Example of sending parameters in URL:

/api/products?category=electronics&sort=price_asc&page=2

Overall, everything needed by the backend to perform logic, process the request, and return the appropriate response is sent from the frontend.