How do I validate JSON payloads with custom rules in Go?

In Go, you can validate JSON payloads using custom rules by unmarshalling the JSON into a struct and then implementing validation logic either in the struct methods or as separate validation functions.

Here’s an example of how to validate JSON payloads using custom rules:


    package main
    
    import (
        "encoding/json"
        "fmt"
        "log"
    )
    
    type User struct {
        Name  string `json:"name"`
        Age   int    `json:"age"`
        Email string `json:"email"`
    }
    
    func (u *User) Validate() error {
        if u.Name == "" {
            return fmt.Errorf("name cannot be empty")
        }
        if u.Age < 0 {
            return fmt.Errorf("age cannot be negative")
        }
        if u.Email == "" || !isValidEmail(u.Email) {
            return fmt.Errorf("invalid email")
        }
        return nil
    }
    
    func isValidEmail(email string) bool {
        // Simplistic email validation
        return len(email) > 5 && len(email) < 255
    }
    
    func main() {
        jsonPayload := `{"name": "Alice", "age": 30, "email": "alice@example.com"}`
    
        var user User
        if err := json.Unmarshal([]byte(jsonPayload), &user); err != nil {
            log.Fatalf("Error unmarshalling JSON: %v", err)
        }
    
        if err := user.Validate(); err != nil {
            log.Fatalf("Validation error: %v", err)
        }
    
        fmt.Println("User is valid")
    }

How do I validate JSON payloads with custom rules in Go?

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How do I validate JSON payloads with custom rules in Go?

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