string getAvailableForms()
{
    import extensions.enumeration : staticMembers;
    import asdf; // JSON serializer
    import std.traits : getUDAs, hasUDA;
    import externalPaths : ExternalAppPath, DisplayName;
    import std.algorithm : startsWith;
    import std.conv : to;

    FormDisplayNameObj[] output;
    static foreach(string fieldName; staticMembers!ExternalAppPath)
    {{
        static if(hasUDA!(__traits(getMember, ExternalAppPath, fieldName), DisplayName))
        {
            if(fieldName.startsWith(startKey))
            {
                DisplayName dn = getUDAs!(__traits(getMember, ExternalAppPath, fieldName), DisplayName)[0];
                string id = extractDigits(fieldName[startKey.length - 1 .. $]);
                int i  = to!int(id);
                auto o = new FormDisplayNameObj();
                o.value = dn.value;
                o.index = i;
                output ~= o;
            }
        }
    }}
    return output.serializeToJson;
}