How to Handle Null Values When Parsing int64 JSON Data in Go?

JSON Parsing of int64 in Go: Handling Null Values

In Go, parsing JSON data containing integer values of type int64 can present challenges when encountering null values. When encountering null values, the default JSON package throws an error due to the inability to unmarshal null into an int64.

Nullable int64 Type for JSON Parsing

To overcome this limitation, a nullable int64 type is necessary. A nullable int64 allows for either a nil value or a valid int64 value. By using a pointer in Go, we achieve this functionality:

type NullableInt64 *int64

When using a pointer for the type, it can either be nil or reference an int64 value.

Implementation

Incorporating the nullable int64 type into the earlier example:

package main

import (
    "encoding/json"
    "fmt"
)

var d = []byte(`{ "world":[{"data": 2251799813685312}, {"data": null}]}`)

type jsonobj struct{ World []World }
type World struct{ Data *int64 } // Using *int64 for nullable int64

func main() {
    var data jsonobj
    jerr := json.Unmarshal(d, &data)
    fmt.Println(jerr)
}

This modification allows the JSON parser to successfully handle null values in the "data" field without encountering errors.

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