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To transmit data to a Spring Boot backend using the FETCH API, the following steps can be followed:

1. Create a javascript object with the data to be transmitted
2. Use the fetch() method to send a request to the Spring Boot backend API with the necessary parameters such as request method, headers, and body
3. Use the then() method to parse the response received from the server and perform any additional operations on the data as needed.

Here's an example of a code snippet that shows how to transmit data to a Spring Boot backend using the FETCH API:

// Create a javascript object with the data to be transmitted
const data = {name: 'John', age: 31};

// Use the fetch() method to send a request to the Spring Boot backend API
fetch('/api/user', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json'
  },
  body: JSON.stringify(data)
})
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error(error));

In this example, we are sending a POST request to a 'user' endpoint in the Spring Boot backend API with the data object created earlier. We are also setting the header to indicate that the payload is in JSON format. The response from the server is parsed as JSON and logged to the console. Any errors that occur during the transmission are caught and logged to the console.