How do you set environment variables in Vercel?

[@moinali9874]

bro why we are adding environment variable in next config file

[@Aryawebcoding]

For security purposes

[@moinali9874]

@Aryawebcoding I have created a contact page in nextjs it's work perfectly on localhost but when I goes to vercel url it's not working I have also added environment variables in vercel