How to Serialize and Deserialize Heterogeneous JSON Arrays in Go?
Dec 11, 2024 pm 02:57 PM
Serializing Heterogeneous JSON Arrays in Go
In Go, serializing heterogeneous JSON arrays (containing a mix of strings, numbers, and unicode characters) poses a challenge due to the language's prohibition on mixed type slices. Consider the following desired JSON structure:
{
results: [
["ooid1", 2.0, "S?me text"],
["ooid2", 1.3, "?ther text"],
]
}
Serialization with a Marshaler Interface
To customize serialization, we can implement the json.Marshaler interface for our Row type. We'll use an intermediate slice of interface{} to encode the heterogeneous values:
package main
import (
"encoding/json"
"fmt"
)
type Row struct {
Ooid string
Score float64
Text string
}
func (r *Row) MarshalJSON() ([]byte, error) {
arr := []interface{}{r.Ooid, r.Score, r.Text}
return json.Marshal(arr)
}
In this example, the MarshalJSON method converts the Row to an array of mixed types.
Deserialization with an Unmarshaler Interface
We can similarly implement the json.Unmarshaler interface to destructure the heterogeneous values:
func (r *Row) UnmarshalJSON(bs []byte) error {
arr := []interface{}{}
json.Unmarshal(bs, &arr)
r.Ooid = arr[0].(string)
r.Score = arr[1].(float64)
r.Text = arr[2].(string)
return nil
}
This method converts the JSON bytes back into our Row structure.
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