Golang iterate over nested struct - json

Question

i want to iterate over a nested json struct in golang. The issue is, i do not exactly know how nested the structure will be, becuase there are multiple jsons. In this case for example the output should be:
"available": false
"type": "foo"
"name": "foo"
"street": "foo"
....
Is that possible?
{
"informations": {
"available": false,
"provide": {
"informations": {
"customer": {
"type": "foo",
"address": {
"name": "foo",
"street": "foo",
"zipcode": "123",
"city": "foo"
}
}
}
}
}
}

Answer 1

I think you can do this with a map[string]interface{}. Because, as you said that you don't know exactly the structure of the JSON. But, again, you need to know the JSON structure each time while extracting data. Also, you need to do type assertion for inner map[string]interface{}. You can look at the answer from here for type assertion.
Here's the example code that I wrote:
package main
import (
"encoding/json"
"fmt"
)
var j = `{
"informations": {
"available": false,
"provide": {
"informations": {
"customer": {
"type": "foo",
"address": {
"name": "foo",
"street": "foo",
"zipcode": "123",
"city": "foo"
}
}
}
}
}
}`
func main() {
var data map[string]interface{}
err := json.Unmarshal([]byte(j), &data)
if err != nil {
fmt.Println(err.Error())
return
}
fmt.Println(data["informations"])
information := data["informations"]
provide := information.(map[string]interface{})["provide"]
fmt.Println(provide)
}
Output will be:
map[available:false provide:map[informations:map[customer:map[address:map[city:foo name:foo street:foo zipcode:123] type:foo]]]]
map[informations:map[customer:map[address:map[city:foo name:foo street:foo zipcode:123] type:foo]]]
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