Advertisements Given the following JSON string: { "username":"bob", "name":"Robert", "locations": [ { "city": "Paris", "country": "France" }, { "city": "Los Angeles", "country": "US" } ] } I need a way to unmarshal this into the a struct like this: type User struct { Username string Name string Cities []string } Where Cities is a slice… Read More json.Unmarshal convert map to slice

Advertisements From front-end I got this example of json: { "properties":{"unknown key": "unknown value","unknown key2": "unknown value 2"} } I start to parse it with map[string]interface{} but it doesn’t work. Also I don’t know how much this fields I can got. It can be 10 or 1. Code: type test struct { p map[string]string `json:"properties"`… Read More How to unmarshal json with unknown field and key

Advertisements I have a YAML file that I am reading in in Golang and unmarshaling to a struct. The file contains several keys, but I only need certain ones. What I am finding is that if I place the keys that aren’t needed for this application at the bottom of the YAML file, everything works… Read More Parsing Only Certain Keys in a YAML File in Golang

Advertisements Following Situation: package main import ( "encoding/json" "fmt" ) func main() { type person struct { Fullname string `json: "fullname"` Age int `json: "age"` } p := person{} err := json.Unmarshal([]byte(`{"fullname": "Michael Jackson", "age": 55}`), &p) fmt.Println(err) // <nil> fmt.Println(p) // {Michael Jackson 55} } Why do I have to write Fullname (instead of,… Read More Struct properties with json.Unmarshal(): Why does the first letter have to be capitalized?

Advertisements package main import ( "encoding/json" "fmt" ) func t() { a := int64(1<<63 – 1) fmt.Println(a) m := map[string]interface{}{ "balance": a, } data, _ := json.Marshal(m) m1 := make(map[string]interface{}) err := json.Unmarshal(data, &m1) panicIF(err) fmt.Println(int64(m1["balance"].(float64))) } func panicIF(err error) { if err != nil { panic(err) } } Running above code will print: 9223372036854775807… Read More Inconsistency in numbers between json Marshall and Unmarshall in Golang

Advertisements Why my unmarshalling is returning an empty Person-struct, in this context? How can I make this program work as expected? E.i., successfully Marshalling and Unmashalling my made-up data. package main import ( "encoding/json" "fmt" ) type Person struct { name string addr string phone string } func main() { p1 := Person{name: "joe", addr:… Read More JSON Marshal and Unmarshal with GO

Advertisements I have an http endpoint that receives some json that I unmarshal into a struct. All fields unmarshal correctly with the exception of an int64 timestamp field. There is no error, but the value is set to 0 instead of the value in the json. I tried changing to an int but got the… Read More Golang: struct does not unmarshal int64 field correctly, other fields are correct

Advertisements Lets say I have two struct that are related like this: type SecretUser struct { UserInfo `json:"userInfo"` Password string `json:"password"` } type UserInfo struct { FirstName string `json:"firstName"` LastName string `json:"lastName"` Email string `json:"email"` } And I receive a JSON in this form: { "firstName": "nice", "lastName":"guy", "email":"nice@guy.co.uk", "password":"abc123" } I want to unmarshall… Read More Custom unmarshalling from flat json to nested struct