How to parse/deserialize dynamic JSON

You can unmarshal into a map[string]string for example:

m := map[string]string{}
err := json.Unmarshal([]byte(input), &m)
if err != nil {
    panic(err)
}
fmt.Println(m)

Output (wrapped):

map[Bangalore_City:35_Temperature NewYork_City:31_Temperature
    Copenhagen_City:29_Temperature]

Try it on the Go Playground.

This way no matter what the keys or values are, you will have all pairs in a map which you can print or loop over.

Also note that although your example contained only string values, but if the value type is varying (e.g. string, numbers etc.), you may use interface{} for the value type, in which case your map would be of type map[string]interface{}.

Also note that I created a library to easily work with such dynamic objects which may be a great help in these cases: github.com/icza/dyno.