What is the main difference between data transmission in URL and in body?

The main difference between transmitting data in the URL and in the body lies in the method and purpose of transmission:

• Data transmission in the URL (for example, via query parameters) is used for transmitting small, often identifying or filtering data. This data is visible in the address bar, can be cached, and easily logged. The URL length restriction imposes limits on the amount of information transmitted.

• Data transmission in the request body (for example, in POST, PUT) allows sending larger volumes of data, including complex structures (JSON, XML). Data in the body is not displayed in the URL and is not limited by URL length, making this method more suitable for transmitting sensitive or voluminous information.

Example:

GET /search?query=example&limit=10 HTTP/1.1

POST /users HTTP/1.1
Content-Type: application/json

{
  "name": "Ivan",
  "age": 30
}