Linux: trim last comma to make valid JSON

I need the last comma removed for this to become valid JSON:
echo '{"connections":{'`netstat -ant | awk '{print $4}' | sed 's/.*://' | tail -n +3 | sort | uniq -c | awk '{ print "\"" $2 "\":" $1 ","};' `'}}'

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hankknightAsked:
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woolmilkporcConnect With a Mentor Commented:
echo '{"connections":{'`netstat -ant | awk '{print $4}' | sed 's/.*://' | tail -n +3 | sort | uniq -c | awk '{ print "\"" $2 "\":" $1 ","};' | sed '$s/,$//'`'}}'

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