Retrieve a list of strings from JSON in java

Question

we are having trouble with getting a message out of a JSON message. We are rather confused by how the response is formatted since the key we receive for the list is empty but that isn't anything we can change. This is a response from a backend API that sends error messages when something goes wrong.

This is the JSON string. What we want to extract to a simple string is "Passwords must be at least 6 characters."

{
  "message": "The request is invalid.",
  "modelState": {
    "": [
      "Passwords must be at least 6 characters."
    ]
  }
}

What we have tried are a few things found over here and here but without any success.

Right now we are completely lost on how to get that one string out of that JSON message so literally any help is appreciated.

Regards, CptSeasick

It's good form to show what you've tried. For example, if the key weren't empty, would you know how to do it? What happens when you try this but with an empty string instead? — dcsohl
– dcsohl, Commented Oct 20, 2015 at 17:48

LeFex · Accepted Answer · 2015-10-20 17:36:56Z

1

You can access it via

object.modelstate[""]

answered Oct 20, 2015 at 17:36

LeFex

2581 silver badge10 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Oğuzhan Döngül · Accepted Answer · 2015-10-20 20:58:50Z

1

Your modelState object's String is named as "". I mean empty string.

If you can change the name of it like below:

{
  "message": "The request is invalid.",
  "modelState": {
    "errorMessage": [
      "Passwords must be at least 6 characters."
    ]
  }
}

and access your object like that:

myJSONobject.getJSONObject("modelState").getJSONArray("errorMessage").getString(0);

or just try :

myJSONobject.getJSONObject("modelState").getJSONArray("").getString(0);

edited Oct 20, 2015 at 20:58

answered Oct 20, 2015 at 17:41

Oğuzhan Döngül

7,9364 gold badges40 silver badges53 bronze badges

Comments

1218985 · Accepted Answer · 2015-10-20 17:57:57Z

0

You can do something like this:

package com.stackoverflow.answer;

import org.json.JSONObject;

public class JsonTest {

    public static void main(String[] args) {
        String response = "{ \"message\": \"The request is invalid.\", \"modelState\": { \"\": [ \"Passwords must be at least 6 characters.\"]}}";
        JSONObject jsonObject = new JSONObject(response);
        String errorMessage = jsonObject.getJSONObject("modelState").getJSONArray("").getString(0);
        System.out.println(errorMessage);
    }

}

answered Oct 20, 2015 at 17:57

1218985

8,1122 gold badges29 silver badges33 bronze badges

1 Comment

CptSeasick Over a year ago

Thank you, this is exactly what we were searching for! We tried similar things before but this resolves our issue.

Collectives™ on Stack Overflow

Retrieve a list of strings from JSON in java

3 Answers 3

Comments

Comments

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related