If key exists i json file-CodePudding

Loading a normal json file. How do I find if this key exists in json string -> jsonstreng["kjoretoydataListe"][0]["kjennemerke"][1]["kjennemerke"]

Doing this of course without breaking my program if it's not.

CodePudding user response：

jsonstreng = {
    "kjoretoydataListe":
    [
        {
            "kjoretoyId": {"kjennemerke":"EK 17058","understellsnummer":"5YJXCCE29GF009633"},
            "forstegangsregistrering": {"registrertForstegangNorgeDato":"2016-09-07"},
            "kjennemerke": [
                {"fomTidspunkt":"2016-09-07T00:00:00 02:00","kjennemerke":"EK 17058","kjennemerkekategori":"KJORETOY",
                "kjennemerketype":{"kodeBeskrivelse":"Sorte tegn p- hvit bunn","kodeNavn":"Ordin-re kjennemerker","kodeVerdi":"ORDINART","tidligereKodeVerdi":[]}},{"fomTidspunkt":"2022-08-19T17:04:04.334 02:00","kjennemerke":"GTD","kjennemerkekategori":"PERSONLIG"}
            ]
        }
    ]
}

def checkIfKeyExistsInDict(in_dict, i_key):
    if(isinstance(in_dict, dict)):
        if(i_key in in_dict):
            print(i_key   " found in: "   str(in_dict))
            print()
        
        for j_key in in_dict:
            checkIfKeyExistsInDict(in_dict[j_key], i_key)
    elif(isinstance(in_dict, list)):
        for j_key in range(len(in_dict)):
            checkIfKeyExistsInDict(in_dict[j_key], i_key)

        
checkIfKeyExistsInDict(jsonstreng, "kjennemerke")

CodePudding user response：

If you are using Python, the way to find if key (let's say "kjennemerke") is present in a JSON object (let's say "jsonstreng") is:

if ("kjennemerke" in jsonstreng):
  """If body goes here"""
  pass

Just for info, if you are trying to do the same in thing in JavaScript the if condition above will look like as shown below:

let jsonstreng_with_key = {
    "kjennemerke": 1
} 

let jsonstreng_without_key = {} // Empty object 

if(jsonstreng_with_key.hasOwnProperty('kjennemerke')){
    console.log("jsonstreng_with_key has key 'kjennemerke'");
} else {
    console.log("jsonstreng_with_key does not have key 'kjennemerke'");
}

if(jsonstreng_without_key.hasOwnProperty("kjennemerke")){
    console.log("jsonstreng_without_key has key 'kjennemerke'");
} else {
    console.log("jsonstreng_without_key does not have key 'kjennemerke'");
}