How to check whether a given string is valid JSON in Java

Question

How do I validate a JSON string in Java? Or could I parse it using regular expressions?

Answer 1

A wild idea, try parsing it and catch the exception:

import org.json.*;

public boolean isJSONValid(String test) {

    try {

        new JSONObject(test);

    } catch (JSONException ex) {

        // edited, to include @Arthur's comment

        // e.g. in case JSONArray is valid as well...

        try {

            new JSONArray(test);

        } catch (JSONException ex1) {

            return false;

        }

    }

    return true;

}

This code uses org.json JSON API implementation that is available on github, in maven and partially on Android.