JSON Data Mapping Key-Value from other Key-Value

[sakibnaz]

Hi. It may very basic question ...

I want to map a Key-Value from another key-Value. Like, for example:

{
Key1: "Test",
Key2: "This will be Value of Key1"
}

In want the Key2 will be Value of Key1 i.e. "Test" when parsing.

Is there any way to define the JSON in such way?

Thanks.

[FrancoisChabot]

If you want to be able to create references like this, you may want to look at yaml (which is a superset of json) instead.

It would look like this:

{
   "key1" : &k1 "Test",
   "key2" : *k1
}

Again: This will not work with this library, or any other json library for that matter. This syntax is specific to yaml.

[nlohmann]

@FrancoisChabot is right. Or do you just want to copy a value?

[sakibnaz]

Thanks for all reply.

@nlohmann , yes actually I want to copy values. Basically in my datasets I'll have some large array's where multiple array will have same data values. Hence rather writing it manually if I can copy values from one key to another within the json, it will be great. Is it possible here?

Regards.

[nlohmann]

The following is possible: j["Key2"] = j["Key1"];.

[sakibnaz]

Understand ... but its inside the c++ code. I wanted to do it in the .json file itself.

[nlohmann]

Then I would need a concrete code example.

[nlohmann]

Meaning, I don't know exactly what you try to achieve.

[sakibnaz]

Ok, let me explain one again may be it will help to clarify.

I have a json file hello.json like below:

{
Key1: "Test",
Key2: ???
}

Here my need is ... if I parse the Value of Key2 it will be Value of Key1 i.e. "Test". So is it possible to define the Value of Key2 in such a way in .json file, so it will contain Value of Key1 internally?

Thanks.

[nlohmann]

Then @FrancoisChabot understood you right, and this is not possible with JSON and this library.

[sakibnaz]

Noted with Thanks,