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Editor to share with you how to achieve password hashing in express+mongodb+middleware in nodejs, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Hash1 the password before saving it

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UserSchema.pre ('save', function (next) {

Var user = this

If (user.isModified ('password')) {

Bcrypt.genSalt (10, (err, salt) = > {

Bcrypt.hash (user.password, salt, (err, hash) = > {

User.password = hash

Next ()

});

});

} else {

Next ()

}

});

Complete Code 1

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Var mongoose = require ('mongoose')

Var express = require ('express')

Var bodyParser = require ('body-parser')

Const {ObjectID} = require ('mongodb')

Var _ = require ('lodash')

Const validator = require ('validator')

Const jwt = require ('jsonwebtoken')

Const bcrypt = require ('bcryptjs')

/ / app

Var app = express ()

Const port = process.env.PORT | | 3000

/ / express middleware Jonson object and string conversion.

App.use (bodyParser.json ())

/ /

Mongoose.Promise = global.Promise

/ / Connect to mogodb

Mongoose.connect (process.env.MONGODB_URI | | 'mongodb://localhost:27017/TodoApp')

/ / template

Var Todo = mongoose.model ('Todo', {

Text: {

Type:String, / / Type

Required:true, / / must have

Minlength:1, / / minimum length

Trim:true / / remove whitespace

}

Completed: {

Type:Boolean

Default:false / / default

}

CompletedAt: {

Type:Number

Default:null

}

});

Var UserSchema = new mongoose.Schema ({

Email: {

Type: String

Required: true

Trim: true

Minlength: 1

Unique: true

Validate: {

Validator: validator.isEmail

Message:'{VALUE} is not a valid email'

}

}

Password: {

Type: String

Require: true

Minlength: 6

}

Tokens: [{

Access: {

Type: String

Required: true

}

Token: {

Type: String

Required: true

}

}]

});

UserSchema.methods.toJSON = function () {

Var user = this

Var userObject = user.toObject ()

Return _ .pick (userObject, ['_ id', 'email'])

}

UserSchema.methods.generateAuthToken = function () {

Var user = this

Var access = 'auth'

Var token = jwt.sign ({_ id: user._id.toHexString (), access}, 'abc123') .toString ()

User.tokens = user.tokens.concat ([{access,token}])

Return user.save () .then (() = > {

Return token; / / returns token

});

}

UserSchema.statics.findByToken = function (token) {

Var User = this

Var decoded

Try {

Decoded = jwt.verify (token, 'abc123')

} catch (e) {

Return Promise.reject ()

}

Return User.findOne ({

'_ id': decoded._id

'tokens.token': token

'tokens.access': 'auth'

});

}

/ / perform the operation before saving.

UserSchema.pre ('save', function (next) {

Var user = this

/ / Update the password when saving

If (user.isModified ('password')) {

Bcrypt.genSalt (10, (err, salt) = > {

/ / password changed to hash

Bcrypt.hash (user.password, salt, (err, hash) = > {

User.password = hash

Next ()

});

});

} else {

Next ()

}

});

Var User = mongoose.model ('User', UserSchema)

/ / auth middlewire

Var authenticate = (req, res, next) = > {

Var token = req.header ('xMuiauth')

User.findByToken (token) .then ((user) = > {

If (! user) {

Return Promise.reject ()

}

Req.user = user

Req.token = token

Next ()

}) .catch ((e) = > {

Res.status. Send ()

});

}

App.get ('/ users/me', authenticate, (req, res) = > {

Res.send (req.user)

});

/ / express route

App.post ('/ todos', (req,res) = > {

/ / console.log (req.body)

/ / create object document

Var todo = new Todo ({

Text:req.body.text

});

/ / Save

Todo.save () .then ((doc) = > {

Res.send (doc)

}, (e) = > {

Res.status (400) .send (e)

});

})

/ / get all attributes

App.get ('/ todos', (req, res) = > {

Todo.find () .then ((todos) = > {

Res.send ({todos})

}, (e) = > {

Res.status (400) .send (e)

})

});

/ / query id

App.get ('/ todos/:id', (req, res) = > {

Var id = req.params.id

If (! ObjectID.isValid (id)) {

Return res.status. Send ()

}

Todo.findById (id) .then ((todo) = > {

If (! todo) {

Return res.status. Send ()

}

Res.send ({todo})

}) .catch ((e) = > {

Res.status (400). Send ()

});

});

/ / Delete

App.delete ('/ todos/:id', (req, res) = > {

Var id = req.params.id

If (! ObjectID.isValid (id)) {

Return res.status. Send ()

}

Todo.findByIdAndRemove (id) .then ((todo) = > {

If (! todo) {

Return res.status. Send ()

}

Res.send ({todo})

}) .catch ((e) = > {

Res.status (400). Send ()

});

});

/ / Update

App.patch ('/ todos/:id', (req, res) = > {

Var id = req.params.id

Var body = _ .pick (req.body, ['text',' completed'])

If (! ObjectID.isValid (id)) {

Return res.status. Send ()

}

If (_ .isBoolean (body.completed) & & body.completed) {

Body.completedAt = new Date () .getTime ()

} else {

Body.completed = false

Body.completedAt = null

}

Todo.findByIdAndUpdate (id, {$set: body}, {new: true}) .then ((todo) = > {

If (! todo) {

Return res.status. Send ()

}

Res.send ({todo})

}) .catch ((e) = > {

Res.status (400). Send ()

})

});

/ / POST / users

App.post ('/ users', (req, res) = > {

Var body = _ .pick (req.body, ['email',' password'])

Var user = new User (body)

User.save () .then (() = > {

Return user.generateAuthToken (); / / calls the method to generate the auth token and save it.

}) .then ((token) = > {

Res.header ('xMaiauthored, token) .send (user); / / set the response header

}) .catch ((e) = > {

Res.status (400) .send (e)

})

});

/ / Monitoring

App.listen (port, () = > {

Console.log (`Start on port ${port} `)

});

Module.exports = {

App

Todo

}

Test 1

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1. Open mongoDB >. / mongod-dbpath / Users/jackson/Downloads/mongodb-data

2. Run > node postman.js

3. Open postman and select post input > localhost:3000/users.

Enter the following in Body:

{

"email": "zhuimengshaonian07@gmail.com"

"password": "123abc!"

}

Return:

{

"_ id": "5bfe716591e78c6a4ad8c164"

"email": "zhuimengshaonian07@gmail.com"

}

Header:

X-auth → eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJfaWQiOiI1YmZlNzE2NTkxZTc4YzZhNGFkOGMxNjQiLCJhY2Nlc3MiOiJhdXRoIiwiaWF0IjoxNTQzNDAxODI5fQ.wOKNzkls_w_jA5YVkCo0r9gFZ4-KtD6GarRiCDpAPr8

4. Look at studio 3T and find that the password has changed to the number after hash.

The above is all the contents of the article "how to implement password hashing in express+mongodb+middleware in nodejs". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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