How to add join in my template

I have array tags and want to join a comma ( , ) in my template. I saw in the statamic doc using the join modifier. but after I try with tags like below it doesn't work and just displays empty.

{{ fields:tags | join }}
   <li>{{ value }}</li>
{{ /fields:tags}}

what should i do with tags join?

Answered by Jack McDade!
>>>>>>> Answered <<<<<<<
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