Passing bash variable to jq

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I have written a script to retrieve certain value from file.json. It works if I provide the value to jq select, but the variable doesn’t seem to work (or I don’t know how to use it).

#!/bin/sh

#this works ***
projectID=$(cat file.json | jq -r '.resource[] | select(.username=="[email protected]") | .id')
echo "$projectID"

[email protected]

#this does not work *** no value is printed
projectID=$(cat file.json | jq -r '.resource[] | select(.username=="$EMAILID") | .id')
echo "$projectID"

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