How to get list of strings from json object

Question

I have the following JSON:

{"errors":[{"code":888,"errorId":"xxx","message":"String value expected","fields":["name", "address"]}, {}, {}]}

I want to be able to get "fields" the following way:

public static String getField(json, errorsIndex, fieldIndex) {
    JSONObject errorJson = json.getJSONArray("errors").getJSONObject(errorIndex);
    String value = errorJson.[getTheListOfMyFields].get(fieldIndex);
    return value;
}

But I can't find a way to make this part [getTheListOfMyFields]. Any suggestion?

no, just a list of strings(List<String>): ["name", "address"] — lenka
– lenka, Commented Aug 18, 2015 at 20:08
At the end, you want value to be the element in the "fields" array at index fieldIndex, is that correct? So for example, if fieldIndex were 1, then value would be "address"? — gla3dr
– gla3dr, Commented Aug 18, 2015 at 20:09

gla3dr · Accepted Answer · 2021-01-05 16:46:47Z

6

Instead of getting a List<String> from the JSON Object, you can access the array of fields in the same way you are accessing the array of errors:

public static String getField(JSONObject json, String errorsIndex, String fieldIndex) {
    JSONObject errorJson = json.getJSONArray("errors").getJSONObject(errorIndex);
    String value = errorJson.getJSONArray("fields").getString(fieldIndex);
    return value;
}

Note that get(fieldIndex) has changed to getString(fieldIndex). That way you don't have to cast an Object to a String.

edited Jan 5, 2021 at 16:46

answered Aug 18, 2015 at 20:26

gla3dr

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3 Comments

lenka Over a year ago

I thought JSONArray is an aray of json objects and it it not applicable here... haha =) Thanks a lot! =)

Dyno Cris Over a year ago

What the type of 'json' parameter, ha?

gla3dr Over a year ago

@DynoCris It's a JSONObject from the org.json package.

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