Well, JSON has a default characters limit to
102400. See
this[
^].
But you can specify the limit in web.config
<system.web.extensions>
<scripting>
<webservices>
<jsonserialization maxjsonlength="any-integer-value" />
</webservices>
</scripting>
</system.web.extensions>
Rather return the split-ed list and combine them on client-side.
-KR