Vue js vee validate password confirmation always false

Below code works for me: https://logaretm.github.io/vee-validate/advanced/cross-field-validation.html#targeting-other-fields

<template>
  <ValidationObserver>
    <ValidationProvider rules="required|password:@confirm" v-slot="{ errors }">
      <input type="password" v-model="password" />
      <span>{{ errors[0] }}</span>
    </ValidationProvider>

    <ValidationProvider name="confirm" rules="required" v-slot="{ errors }">
      <input type="password" v-model="confirmation" />
      <span>{{ errors[0] }}</span>
    </ValidationProvider>
  </ValidationObserver>
</template>

<script>
import { extend } from 'vee-validate';

extend('password', {
  params: ['target'],
  validate(value, { target }) {
    return value === target;
  },
  message: 'Password confirmation does not match'
});

export default {
  data: () => ({
    password: '',
    confirmation: ''
  })
};
</script>

Your password input must have ref="password" - that's how vee-validate finds the target:

<input v-validate="'required'" ... ref="password"> (Thanks, Ryley).

confirmed:{target} - Input must have the same value as the target input, specified by {target} as the target field’s name.

Also, there's an error with your Vee Validate syntax, change target: to confirmed:

v-validate="'required|target:password'"

should be

v-validate="'required|confirmed:password'"

Have a look at the basic example below, it will check for two things:

• Does the second input field have any input value?
• If yes, does the second input value match the first input value?

var app = new Vue({
  el: '#app',
  data: {
    message: 'Hello Vue!'
  }
})

body {
  background: #20262E;
  padding: 15px;
  font-family: Helvetica;
}

#app {
  width: 60%;
  background: #fff;
  border-radius: 10px;
  padding: 15px;
  margin: auto;
}

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/vue.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vee-validate/2.1.1/vee-validate.js"></script>
<script>
  Vue.use(VeeValidate);
</script>


<div id="app">

  <form id="demo">

    <!-- INPUTS -->
    <div class="input-group">
      <h4 id="header"> Enter Password</h4>

      <div class="input-fields">
        <input v-validate="'required'" name="password" type="password" placeholder="Password" ref="password">

        <input v-validate="'required|confirmed:password'" name="password_confirmation" type="password" placeholder="Password, Again" data-vv-as="password">
      </div>
    </div>

    <!-- ERRORS -->
    <div class="alert alert-danger" v-show="errors.any()">
      <div v-if="errors.has('password')">
        {{ errors.first('password') }}
      </div>
      <div v-if="errors.has('password_confirmation')">
        {{ errors.first('password_confirmation') }}
      </div>
    </div>

  </form>
</div>

Further reading: https://baianat.github.io/vee-validate/guide/rules.html#confirmed