main.go

package main

import (
	"encoding/json"

	"github.com/xeipuuv/gojsonschema"

	"fmt"
)

type User struct {
	Name     string
	Age      uint16
	Articles []Article
}

type Article struct {
	Title   string
	Content string
}

func main() {
	var jsonStr = `{
		"Name": "Ken",
		"Age": 32,
		"Articles": [
			{"Title": "Title A", "Content": "content A"},
			{"Title": "Title B", "Content": "content B"}
		]
	}`

	schema := `{
		"type": "object",
		"properties": {
			"Name": {
				"type": "string"
			},
			"Age": {
				"type": "integer"
			},
			"Articles": {
				"type": "array",
				"items": {
					"type": "object",
					"properties": {
						"Title": {
							"type": "string"
						},
						"Content": {
							"type": "string"
						}
					},
					"additionalProperties": false,
					"required": ["Title", "Content"]
				}
			}
		},
		"additionalProperties": false,
		"required": ["Name", "Age", "Articles"]
	}`

	var j map[string]interface{}
	err := json.Unmarshal([]byte(schema), &j)
	if err != nil {
		panic(err)
	}

	schemaDocument, err := gojsonschema.NewJsonSchemaDocument(j)
	if err != nil {
		panic(err)
	}

	var jsonBody interface{}
	err = json.Unmarshal([]byte(jsonStr), &jsonBody)
	if err != nil {
		panic(err)
	}

	result := schemaDocument.Validate(jsonBody)
	if result.Valid() == false {
		panic("err")
	}

	var u User
	err = json.Unmarshal([]byte(jsonStr), &u)
	if err != nil {
		panic(err)
	}

	fmt.Println(u) // {Ken 32 [{Title A content} {Title B content}]}
}