Building Microservices with Go

Unmarshalling JSON to Go structs

Now we have learned how we can send JSON back to the client, what if we need to read input before returning the output? We could use URL parameters and we will see what that is all about in the next chapter, but commonly you will need more complex data structures that involve the service to accept JSON as part of an HTTP POST request.

Applying similar techniques that we learned in the previous section to write JSON, reading JSON is just as easy. To decode JSON into a stuct field the encoding/json package provides us with the Unmarshal function:

func Unmarshal(data []byte, v interface{}) error 

The Unmarshal function works in the opposite way to Marshal; it allocates maps, slices, and pointers as required. ...