How to Unmarshal Unknown JSON Data Structures in Go?

Unmarshal JSON Data of Unknown Format

The provided JSON follows a specific pattern:

{
SUBJECT1: [{Student_Name1: Grade, Student_Name2: Grade, ... , Student_Name3: Grade, timestamp: Timestamp(...)}],
SUBJECT2: [{Student_Name4: Grade, Student_Name6: Grade, ... , Student_Name5: Grade, timestamp: Timestamp(...)}]
...
SUBJECTN: [{Student_Name1: Grade, Student_Name6: Grade, ... , Student_Name9: Grade, timestamp: Timestamp(...)}]
}

Goal: Unmarshal the JSON into a GoLang struct for return as a JSON object.

Solution:

Option 1: Using map[string]interface{}

Since the JSON keys are unknown, we can use map[string]interface{} to unmarshal the payload.

var grades map[string]interface{}
err := json.Unmarshal([]byte(jsonString), &grades)
fmt.Println(err)
fmt.Printf("%#v\n", grades)

Option 2: Using a Struct

If a struct is desired, use the json:"-" tag to ignore fields during JSON marshalling/unmarshalling.

type GradeData struct {
    Grades map[string]interface{} `json:"-"`
}

err := json.Unmarshal([]byte(jsonString), &gradesData.Grades)
fmt.Println(err)
fmt.Printf("%#v\n", gradesData)

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