How to encode JSON data in Golang?

The following steps can be used to encode JSON data in Go: Use json.Marshal to encode Go types into JSON byte slices. Use json.Unmarshal to decode Go types from JSON encoding and store JSON byte slices in Go types.

How to encode JSON data in Golang?

Encoding JSON data in Go is a straightforward process that can be accomplished using the encoding/json standard library. The library provides a rich set of functions for encoding Go types to JSON and decoding Go types from JSON encoding.

Encoding Go types to JSON

To encode Go types to JSON, you can use the json.Marshal function. This function accepts a Go value and returns its corresponding JSON-encoded byte slice.

package main

import (
    "encoding/json"
    "fmt"
)

type User struct {
    Name  string
    Age   int
    Admin bool
}

func main() {
    user := User{Name: "John Doe", Age: 30, Admin: false}

    jsonBytes, err := json.Marshal(user)
    if err != nil {
        fmt.Println("Error encoding user:", err)
        return
    }

    fmt.Println(string(jsonBytes))
}

The above code snippet will output the following JSON:

{"Name":"John Doe","Age":30,"Admin":false}

Decoding JSON into a Go type

To decode a Go type from JSON encoding, you can use json .Unmarshal function. This function accepts a JSON-encoded slice of bytes and stores the corresponding value in the provided Go type.

package main

import (
    "encoding/json"
    "fmt"
)

type User struct {
    Name  string
    Age   int
    Admin bool
}

func main() {
    jsonBytes := []byte(`{"Name":"John Doe","Age":30,"Admin":false}`)

    var user User
    if err := json.Unmarshal(jsonBytes, &user); err != nil {
        fmt.Println("Error decoding user:", err)
        return
    }

    fmt.Println(user)
}

The above code snippet will output the following results:

{John Doe 30 false}

Practical case

In many practical scenarios, it is necessary to encode Go types into JSON, such as:

• Building an HTTP API
• Storing data into a JSON file
• Transmitting data in a distributed system

Instead, encode and decode Go types from JSON There are also many practical applications, such as:

• Parse HTTP API response
• Read data from JSON file
• Receive data from distributed system

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