Simone Carletti Simone Carletti - 7 days ago 6
JSON Question

Unmarshaling nested JSON objects in Golang

There are a few questions on the topic but none of them seem to cover my case, thus I'm creating a new one.

I have JSON like the following:

{"foo":{ "bar": "1", "baz": "2" }, "more": "text"}


Is there a way to unmarshal the nested bar property and assign it directly to a struct property without creating a nested struct?

The solution I'm adopting right now is the following:

type Foo struct {
More String `json:"more"`
Foo struct {
Bar string `json:"bar"`
} `json:"foo"`
// FooBar string `json:"foo.bar"`
}


This is a simplified version, please ignore the verbosity. As you can see, I'd like to be able to parse and assign the value to

// FooBar string `json:"foo.bar"`


I've seen people using a map, but that's not my case. I basically don't care about the content of
foo
(which is a large object), except for a few specific elements.

What is the correct approach in this case? I'm not looking for weird hacks, thus if this is the way to go, I'm fine with that.

Answer

Is there a way to unmarshal the nested bar property and assign it directly to a struct property without creating a nested struct?

No, encoding/json cannot do the trick with ">some>deep>childnode" like encoding/xml can do. Nested structs is the way to go.

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