How to validate JSON data in Golang?

JSON data validation in Golang can be achieved by using the Unmarshal function of the encoding/json package to decode JSON data into a Go struct corresponding to the JSON structure. The steps are as follows: Define the struct corresponding to the JSON data structure as a verification blueprint. Use the Unmarshal function to decode and verify whether it is compatible with the type of struct. For more complex validation, write a custom validation function.

JSON Data Validation in Golang

JSON (JavaScript Object Notation) is a lightweight and widely used format for data exchange. In Golang, we can use the encoding/json package to validate JSON data.

Introducing the necessary packages

import (
    "encoding/json"
    "log"
)

Struct definition

First, we need to define a Go struct corresponding to the JSON data structure. This will serve as a blueprint for validation.

type User struct {
    Name    string  `json:"name"`
    Age     int     `json:"age"`
    Email   string  `json:"email"`
    IsAdmin bool    `json:"is_admin"`
}

Validate JSON data

Now, we can use the Unmarshal function provided by the encoding/json package to decode the JSON data into our struct ：

func validateJSON(jsonString string) (User, error) {
    var user User

    if err := json.Unmarshal([]byte(jsonString), &user); err != nil {
        log.Printf("Error unmarshaling JSON: %v", err)
        return User{}, err
    }

    return user, nil
}

Practical case

Let us consider a string containing the following JSON data:

{
    "name": "Alice",
    "age": 25,
    "email": "alice@example.com",
    "is_admin": false
}

We can validate it using the validateJSON function :

jsonString := `{
    "name": "Alice",
    "age": 25,
    "email": "alice@example.com",
    "is_admin": false
}`

user, err := validateJSON(jsonString)
if err != nil {
    log.Fatal(err)
}

fmt.Println("Validated user:", user)
// 输出：Validated user: {Alice 25 alice@example.com false}

Custom validation

Unmarshal The function can be used to verify whether the data is compatible with the types in the Go struct. For more complex validation, we need to write a custom validation function.

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