Tidies up a JSON string in Java

JSONTidier.java

package me.paulbgd.bgdcore.json;

public class JSONTidier {

private static final String tab = "\t";
private static final String line = "\n";

public static String tidyJSON(String json) {
    StringBuilder string = new StringBuilder();
    int tabCount = 0;
    boolean quotes = false;
    char[] charArray = json.toCharArray();
    for (int i = 0, charArrayLength = charArray.length; i < charArrayLength; i++) {
        char c = charArray[i];
        if (c == '"' && i != 0 && charArray[i - 1] != '\\') {
            quotes = !quotes;
        }
        if (quotes) {
            string.append(c);
            continue;
        }
        switch (c) {
            case '{':
            case '[':
                string.append(c).append(line);
                tabCount++;
                for (int j = 0; j < tabCount; j++) {
                    string.append(tab);
                }
                break;
            case '}':
            case ']':
                string.append(line);
                tabCount--;
                for (int j = 0; j < tabCount; j++) {
                    string.append(tab);
                }
                string.append(c);
                break;
            case ',':
                string.append(c);
                if (i + 1 != charArrayLength && charArray[i + 1] != '{' && charArray[i + 1] != '[') {
                    string.append(line);
                    for (int j = 0; j < tabCount; j++) {
                        string.append(tab);
                    }
                }
                break;
            case ':':
                string.append(c).append(" ");
                break;
            default:
                string.append(c);
                break;
        }
    }
    return string.toString();
}

}