How to extract array element without key?

Question

I have a json as below. I want a json path expression that checks if [e3] exists in the below json. Can someone help please?

{
    "status": "ok",
    "error": [
        "[e1]",
        "[e2]",
        "[e3]",
        "[e4]"
    ]
}

I tried it, Didn't work. I tried it in jsonpath.herokuapp.com — Anoop
– Anoop, Commented Oct 18, 2021 at 22:23
Based on this answer stackoverflow.com/a/52977857/1065197. I tested using $[?(@.error[?(@ == '[e3]')] != [])] and Jayway JsonPath evaluator. — Luiggi Mendoza
– Luiggi Mendoza, Commented Oct 18, 2021 at 22:39
Yeah Luiggi. That works. It returns the whole json if [e3] is present. Is there a way to return 'yes' or something more specific? Returning [e3] itself is also fine. Thank You. — Anoop
– Anoop, Commented Oct 18, 2021 at 22:58
@LuiggiMendoza Jsonpath doesn’t always return json. If the path is definite you can actually cast it to the expected return type. $.status and $.error[2] returns string — Akshay G
– Akshay G, Commented Oct 19, 2021 at 7:09

Akshay G · Accepted Answer · 2021-10-19 06:51:47Z

1

The below JSONPath will return a list with one element. Indefinite paths always returns a list. A path is indefinite if it contains an expression - ?(<expression>). Refer What is Returned When?

$.error[?(@ == '[e3]')]

answered Oct 19, 2021 at 6:51

Akshay G

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2 Comments

Akshay G Over a year ago

List<String> errorCodes = JsonPath.read(json, "$.error[?(@ == '[e3]')]");

Anoop Over a year ago

That is just what I want. Thank You, Akshay.

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