CODEWITHSUNDEEP
jsonjsonpath
Stefan
Stefan

Reputation: 1553

Get keys in JSON

I get the following JSON result from an external system:

{
  "key1": "val1",
  "key2": "val2",
  "key3": "val3"
}

Now I want to display all keys and all values by using JSONPath. So I am looking for something to get key1, key2 and key3 as a result. Additionally I would like to use the index of a property, e. g. $....[2].key to get "key3" etc. Is there a way to do something like this?

Upvotes: 27

Views: 38795

Answers (3)

patrickl
patrickl

Reputation: 1

in case you need the keys when using kubectl combined with jsonpath=, a workaround could be to have jq filter the keys only.

kubectl get secret my_secret --no-headers -o jsonpath='{.data}' | jq 'keys'

Upvotes: 0

Hasan Khan
Hasan Khan

Reputation: 544

For the java json path use below expression:

 private static Configuration getConfiguration() {
        return Configuration.builder().options(Option.AS_PATH_LIST).build();
    }
    DocumentContext parsedBodyWithJsonPath = using(getConfiguration()).parse(jso);
    List<String> read = parsedBodyWithJsonPath.read("$.*");
    System.out.println("keys: "+read);

output :

keys: ["$['key1']","$['key2']","$['key3']"]

Upvotes: 0

Viktor
Viktor

Reputation: 2783

I found that the tilda ~ symbol is able to retrieve the keys of the values it's called upon. So for your example a query like this:

$.*~

Returns this:

[
  "key1",
  "key2",
  "key3"
]

Another example, if we had a JSON document like this:

  {
  "key1": "val1",
  "key2": "val2",
  "key3": {
      "key31":"val31",
      "key32":"val32"
  }
}

A query like this:

$.key3.*~

Would return this:

[
  "key31",
  "key32"
]

It's important to note that these examples work on JSONPath.com and some other simulators/online tools, but on some they don't. It might come from the fact that I found out about the tilda(~) operator in the JSONPath plus documentation and not the official one.

Upvotes: 51

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