Get keys from json object

[Radmir2015]

Is it possible to get all keys from json object (like on picture)?

[nlohmann]

You may want to have a look at the items() function.

[Radmir2015]

Thank you so much. I already tried this method and it did not work for me, because I forgot to add (), I thought that key and value are properties.
And now I realized that this is a function and it returns a json-object.

[nlohmann]

@Radmir2015 Can we close this issue or do you need further assistance?

[Radmir2015]

Yes, of course. Thanks.

[arpit279]

when I am trying to use the item method, I am facing this error:-
‘using json = using json = class nlohmann::basic_json<> {aka class nlohmann::basic_json<>}’ has no member named ‘items’

[nlohmann]

Which version are you using? items was only introduced in a later version. Before, the function was called iterator_proxy.

[arpit279]

what version are you asking ? if the library then it is 2.1.1-1.1, and does the function iterator_proxy works same as items ?

[nlohmann]

Basically yes, but you should consider updating the library - there have been multiple bug fixes and performance improvements since.

[arpit279]

Can you please guide me in updating, Since I am new to this things, I am still learning.
I tried the sudo apt-get install --only-upgrade nlohmann-json-dev command, but it shows already a newest version. please help.

[nlohmann]

This seems to be related to #1438. I do not know who's in charge of that package.

You could also download the json.hpp header here and adjust your include directory to use that header rather than the outdated version.

[arpit279]

Thank you so much,
Now my code is working as expected.