Disallow single quoted values in JSON

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I'm parsing a Json file which should be formatted according to json's formal specification, which doesn't include the possibility of wrapping keys and values in single quotes ('). However, using either org.json or gson, the implementation is accepting those entries and successfully converting the file to a JsonObject. I need that to fail (there is a second validation in my flow which doesn't allow single quotes).

I've been looking into ways of configuring the parsers so that they fail. I've read that Jackson's JsonParser doesn't allow that by default, having then the possibility to explicitly change that. Could I do the same with one of the previously mentioned libraries, or should I use Jackson instead?

Thank you!

jackson gson json java
1 Answers

org.json is open-source, so you can build a modified version that doesn't allow single-quoted string literals.

In the JSONTokener class, modify the nextValue() method.

public Object nextValue() throws JSONException {
    char c = this.nextClean();
    String string;

    switch (c) {
    case '"':
    case '\'': // ← ← ← ← ← ← ← ← ← ← ← ← REMOVE OR COMMENT THIS LINE
        return this.nextString(c);
    case '{':
        this.back();
        return new JSONObject(this);
    case '[':
        this.back();
        return new JSONArray(this);
    }
    
    ...
user_52211490
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