Environment

Issue

The Acrolinx for AEM Sidebar is unusable and returns an "Invalid JSON" error message.

Solution

A configuration needs to be added to the AEM Dispatcher by an AEM administrator or the AEM service provider. This needs to be added in Dispatcher:
 

Example Filter: Enable POST Requests
The following example filter allows submitting form data by the POST method:

/filter {
    /0001 { /type "allow" /method "POST" /url "/apps/acrolinx/proxy/*" }
}

If the issue still occurs after POST requests have been allowed, check for an empty node under the paths /apps/acrolinx/proxy/api/v1/auth/sign-ins. 

If the AEM default POST servlet is triggered and creates this empty node, delete the additional node to restore Sidebar functionality.