Parse stringified JSON - json

Question

I'm trying to parse stringified JSON with Go, but I cannot find anything that explains how do to efficient parsing.
Example JSON:
{
"messages":"<ul class=\"messages\"><li class=\"success-msg\"><ul><li><span>Item succcessfully added<\/span><\/li><\/ul><\/li><\/ul>",
"app_cart":"[]",
"addcartrows":"[{\"productId\":\"1675688\",\"quantity\":1,\"unitPrice\":\"290.00\",\"currency\":\"EUR\",\"sku\":\"P00525485-3\"}]",
"minicart_content":"<ul class=\"checkout-types minicart\">\n
<li>",
"cart_qty":"1",
"added_product_json":"{\"id\":\"1675695\",\"size\":\"40\"}"
}
I usually parse json by casting it to a struct. like this:
type AutoGenerated struct {
Messages string `json:"messages"`
AppCart string `json:"app_cart"`
Addcartrows string `json:"addcartrows"`
MinicartContent string `json:"minicart_content"`
CartQty string `json:"cart_qty"`
AddedProductJSON string `json:"added_product_json"`
}
var j AutoGenerated
if err = json.Unmarshal(body, &AutoGenerated); err != nil {
fmt.Println(err) // json: cannot unmarshal string into Go struct field AutoGenerated.added_product_json
}
However I do not know how to correctly parse this type of response.
Any help?

Answer 1

do it in two steps.
package main
import (
"encoding/json"
"fmt"
)
func main() {
type AutoGenerated struct {
Messages string `json:"messages"`
AppCart string `json:"app_cart"`
Addcartrows string `json:"addcartrows"`
MinicartContent string `json:"minicart_content"`
CartQty string `json:"cart_qty"`
AddedProductJSON string `json:"added_product_json"`
}
type addedProduct struct {
ID string `json:"id"`
Size string `json:"size"`
}
type productRow struct {
ProductID string `json:"productId"`
Quantity int `json:"quantity"`
UnitPrice string `json:"unitPrice"`
Currency string `json:"currency"`
SKU string `json:"sku"`
}
var j AutoGenerated
body := []byte(`{
"messages":"<ul class=\"messages\"><li class=\"success-msg\"><ul><li><span>Item succcessfully added<\/span><\/li><\/ul><\/li><\/ul>",
"app_cart":"[]",
"addcartrows":"[{\"productId\":\"1675688\",\"quantity\":1,\"unitPrice\":\"290.00\",\"currency\":\"EUR\",\"sku\":\"P00525485-3\"}]",
"minicart_content":"<ul class=\"checkout-types minicart\">\n<li>",
"cart_qty":"1",
"added_product_json":"{\"id\":\"1675695\",\"size\":\"40\"}"
}`)
if err := json.Unmarshal(body, &j); err != nil {
panic(err)
}
var k []productRow
if err := json.Unmarshal([]byte(j.Addcartrows), &k); err != nil {
panic(err)
}
var u addedProduct
if err := json.Unmarshal([]byte(j.AddedProductJSON), &u); err != nil {
panic(err)
}
fmt.Printf("%#v\n\n", j)
fmt.Printf("%#v\n\n", k)
fmt.Printf("%#v\n\n", u)
}

Answer 2

Assuming the json you have added has a formatting issue for value of "minicart_content" , below should help -
package main
import (
"fmt"
"encoding/json"
)
var myjson string = `{
"messages": "<ul class=\"messages\"><li class=\"success-msg\"><ul><li><span>Item succcessfully added<\/span><\/li><\/ul><\/li><\/ul>",
"app_cart": "[]",
"addcartrows": "[{\"productId\":\"1675688\",\"quantity\":1,\"unitPrice\":\"290.00\",\"currency\":\"EUR\",\"sku\":\"P00525485-3\"}]",
"minicart_content": "<ul class=\"checkout-types minicart\">\n <li > ",
"cart_qty": "1",
"added_product_json": "{\"id\":\"1675695\",\"size\":\"40\"}"
}`
type AutoGenerated struct {
Messages string `json:"messages"`
AppCart string `json:"app_cart"`
Addcartrows string `json:"addcartrows"`
MinicartContent string `json:"minicart_content"`
CartQty string `json:"cart_qty"`
AddedProductJSON string `json:"added_product_json"`
}
func main() {
var j AutoGenerated
if err := json.Unmarshal([]byte(myjson), &j); err != nil {
fmt.Println(err)
}
fmt.Println(j.AddedProductJSON)
}