How to convert JSON data to structure in Golang?

In Golang, JSON data can be converted into a structure through the following steps: define a structure with field names that match the JSON attribute names, and use the json tag to specify the JSON field names. Use the json.Unmarshal function from the encoding/json package to parse a JSON string and convert it into a pointer to a structure. Check for parsing errors. Access structure fields to extract data.

How to convert JSON data into a structure in Golang

Introduction

Golang provides the encoding/json package to easily process JSON data. It allows you to convert JSON data into structures, making it easy to access and manipulate JSON data.

Practical case

Suppose you have a JSON string:

{
  "name": "John Doe",
  "age": 30,
  "occupation": "Software Engineer"
}

and want to convert it into a structure. Here are the steps:

1. Define the structure:

type Person struct {
  Name       string `json:"name"`
  Age        int    `json:"age"`
  Occupation string `json:"occupation"`
}

• struct keyword creates a new Structure type.
• Field names match JSON property names.
• json tag specifies the JSON field name.

2. Parse JSON data:

import "encoding/json"

var jsonStr = `{
  "name": "John Doe",
  "age": 30,
  "occupation": "Software Engineer"
}`

var person Person

err := json.Unmarshal([]byte(jsonStr), &person)
if err != nil {
  // 处理错误
}

• json.Unmarshal The function parses the JSON string and Convert it to a pointer to a structure.
• jsonStr is a JSON string.
• person is the target structure.
• If there is an error, Unmarshal will return that error.

3. Accessing structure fields:

fmt.Println(person.Name)  // "John Doe"
fmt.Println(person.Age)   // 30
fmt.Println(person.Occupation)  // "Software Engineer"

• Once the JSON data is parsed correctly, you can access it just like any other Structure fields are accessed just like structure members.

Note

• Make sure that the type of the structure field is compatible with the value type in the JSON attribute.
• JSON property names must match structure field names unless you use the json tag.
• If the JSON data cannot be parsed, check for errors in Unmarshal.

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