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src/js/service/passwordService.js

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+const bcrypt = require('bcrypt');
+const saltRounds = 10;
+
+class PasswordService {
+    /**
+     * Hashes the password in parameters.
+     * @param {String} password The plain text password.
+     * @returns The hashed password.
+     */
+    hashPassword(password) {
+        const salt = bcrypt.genSaltSync(saltRounds);
+        return bcrypt.hashSync(password, salt);
+    }
+
+    /**
+     * Checks if the {@code plainTextPassword} matches the hashed password.
+     * @param {String} plainTextPassword The plain text password.
+     * @param {String} hashedPassword The hashed password.
+     * @returns A boolean.
+     */
+    areSamePasswords(plainTextPassword, hashedPassword) {
+        return bcrypt.compareSync(plainTextPassword, hashedPassword);
+    }
+}
+
+const singleton = new PasswordService();
+module.exports = singleton;