Zwibbler Collaboration Server tester

This web page will test your implementation of the Zwibbler Collaboration Server

Zwibbler Collaboration Server Protocol V2

WebSocket url:

NOTE! If this page is served from https, you must use a wss:// url. To connect to a websocket through HTTP, save this page and its scripts and run locally.

The stress test starts 100 sockets. They will each append 10 numbers to a document, one number at a time. By the end of the test, the document should consisting of the numbers 0,1,2,...,999 as a long text string. Only one client can modify the document at a time, so for each successful append, all of the other clients will fail and need to re-append the next number.

Number of clients active:
Number of errors:
Test status:

Server sent to :

sent to server: