Example of using bcrypt with mongoose middleware to enforce password hashing with bcrypt on save.

user.js

var mongoose = require('mongoose'),                                                                                                                                            
    Schema = mongoose.Schema                                                                                                                                                                                                                                                                                                                                
                                                                                                                                                                               
var bcrypt = require('bcrypt')                                                                                                                                                 
                                                                                                                                                                                                                                                                                                                                                              
var UserSchema = new Schema( {                                                                                                                                                 
    email: String,                                                                                                                                                             
    password: String                                                                                                                                                           
} )                                                                                                                                                                                                                                                                                                                                                          
                                                                                                                                                                               
// pre                                                                                                                                                                         
UserSchema.pre('save', function(next) {                                                                                                                                        
    if(this.password) {                                                                                                                                                        
        var salt = bcrypt.genSaltSync(10)                                                                                                                                     
        this.password  = bcrypt.hashSync(this.password, salt)                                                                                                                
    }                                                                                                                                                                          
    next()                                                                                                                                                                     
})                                                                                                                                                                                                                                                                                                                                                          
                                                                                                                                                                               
mongoose.model('User', UserSchema);

ohhh, that's my ignorance. I didn't notice that. I am just learning nodejs

thank you for a prompt response

@exlane, here is the code with async/await

UserSchema.pre('save', async function(next) {                                                                                                                                        
    if(this.password) {                                                                                                                                                        
        var salt = await bcrypt.genSaltSync(10)                                                                                                                                     
        this.password  = await bcrypt.hashSync(this.password, salt)                                                                                                                
    }                                                                                                                                                                          
    next()                                                                                                                                                                     
}) 

All this code is incorrect... you must test if the password was modified before hashing it, or you will double hash it...

userSchema.pre('save', async function(next){

if(this.isModified('password')) this.password = await bcrypt.hash(this.password, 12)

next()

})

myoussef3030 thanks for the great snippet works perfectly.

userSchema.pre('save', async function (next) {
const user = this;
if (user.isModified('password')) {
user.password = await bcrypt.hash(user.password, 8)
}
next()
})
for a readability we can also user variable like this