Why Does 'json: cannot unmarshal array into Go value of type main.Structure' Occur and How Can I Fix It?

Unmarshaling Arrays and Struct Types

When attempting to parse JSON data into a struct, it's crucial to ensure compatibility between the data structure and the target type. The following error message:

panic: json: cannot unmarshal array into Go value of type main.Structure

indicates that the application is attempting to unmarshal an array from JSON into a struct that expects a different type.

To resolve this issue, consider the following solutions:

• Unmarshal to a Slice:

If the JSON data is an array of objects, unmarshal it to a slice of interface{} or a slice of specific structs depending on the structure of your JSON data:

var data []interface{}
err = json.Unmarshal(body, &data)

// Unmarshal to specific structs:
type Tick struct {
     ID string
     Name string
     ...
}

var data []Tick
err = json.Unmarshal(body, &data)

• Modify the Struct:

If you need to retain the existing struct, consider modifying its field type to accept an array:

type Structure struct {
     stuff [][]interface{} // Change to a slice of slices
}

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