I have found programs that compress Javascript code in the past, and I have been using it all the time, and it feels that the effect is good.
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Online compression of Javascript source code
Just clean up spaces, line breaks, extra comments, etc., especially when Shrink variables is selected, the long variable name will be reduced to a single letter variable name, and the compression ratio can usually reach 50% or even smaller. Nowadays, AJAX is popular and JavaScript files are getting bigger and bigger. Using this compression should reduce a lot of traffic burden. Moreover, after reducing the variable name, the program is not encrypted, but it will make the program difficult to understand, and to a certain extent, it can also protect the copyright.
I found another program to format the code today
/beautify/
The compressed JS code can be reformatted to be easy to read. Of course, if the variable name is reduced during compression, it is impossible to restore the original meaningful variable name.
When encountering a particularly large JS file, the browser will report that it takes too long and will not stop. In the end, it can complete the execution.