Bcrypt password hashing in Golang (compatible with Node.js)?


I set up a site with Node.js+passport for user authentication.

Now I need to migrate to Golang, and need to do authentication with the user passwords saved in db.

The Node.js encryption code is:

    var bcrypt = require('bcrypt');

    bcrypt.genSalt(10, function(err, salt) {
        if(err) return next(err);

        bcrypt.hash(user.password, salt, function(err, hash) {
            if(err) return next(err);
            user.password = hash;

How to make the same hashed string as Node.js bcrypt with Golang?


Using the golang.org/x/crypto/bcrypt package, I believe the equivalent would be:

hashedPassword, err := bcrypt.GenerateFromPassword(password, bcrypt.DefaultCost)

Working example:

package main

import (

func main() {
    password := []byte("MyDarkSecret")

    // Hashing the password with the default cost of 10
    hashedPassword, err := bcrypt.GenerateFromPassword(password, bcrypt.DefaultCost)
    if err != nil {

    // Comparing the password with the hash
    err = bcrypt.CompareHashAndPassword(hashedPassword, password)
    fmt.Println(err) // nil means it is a match

Answered By – ANisus

Answer Checked By – Marilyn (GoLangFix Volunteer)

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