Thank you. I apologize for the delay.
Great you have the latest jsreport now.

I see from the logs that the timeout comes after 10s. That is typically default value. Please change this to some big value.

"templatingEngines": { "timeout": 1800000 },

If this won't help... How many lines of excel do you produce?
If the rendering doesn't end after some minutes, it must be really big input.
Or there can be another error.
In that case it would help me if you email me the export from jsreport studio and the input data set.
So I can check it out.

Thank you