diff --git a/helpers/authValidation.js b/helpers/authValidation.js
new file mode 100644
index 0000000..2bd6a72
--- /dev/null
+++ b/helpers/authValidation.js
@@ -0,0 +1,36 @@
+const Joi = require('joi');
+
+const registerSchema = Joi.object({
+  fullname: Joi.string().min(3).max(100).required(),
+  username: Joi.string().alphanum().min(3).max(50).required(),
+  email: Joi.string().email().required(),
+  phone: Joi.string()
+  .pattern(/^(?:\+62|0)8\d{7,10}$/)
+  .required()
+  .messages({
+    'string.pattern.base': 'Phone number must be a valid Indonesian number in format +628XXXXXXXXX'
+  }),
+  password: Joi.string()
+    .min(8)
+    .pattern(/[A-Z]/, 'uppercase letter')
+    .pattern(/[a-z]/, 'lowercase letter')
+    .pattern(/\d/, 'number')
+    .pattern(/[!@#$%^&*(),.?":{}|<>]/, 'special character')
+    .required()
+    .messages({
+      'string.min': 'Password must be at least 8 characters long',
+      'string.pattern.name': 'Password must contain at least one {#name}'
+    })
+});
+
+const loginSchema = Joi.object({
+  email: Joi.string().email().required(),
+  password: Joi.string().required(),
+  captcha: Joi.string().required(),
+  captchaText: Joi.string().required()
+});
+
+module.exports = {
+  registerSchema,
+  loginSchema
+};