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jwt token expire time in node js

 var token = jwt.sign({email_id:'123@gmail.com'}, "Stack", {
        expiresIn: "10h" // it will be expired after 10 hours
        //expiresIn: "20d" // it will be expired after 20 days
        //expiresIn: 120 // it will be expired after 120ms
        //expiresIn: "120s" // it will be expired after 120s
 });

how to set expire time of jwt token in node js

var token = jwt.sign({email_id:'123@gmail.com'}, "Stack", {

                        expiresIn: '24h' // expires in 24 hours

                         });