Introduction

Vuelidate is a great library! No BUTS.

Fluent-vuelidate serves the same purpose by closely knitting a fluent, typescripted API around your validation flows.

Npm Installation

npm install fluent-vuelidate

Check this out.

What if we could do validations like this

const validator = useValidator<LoginCredentials>(credentials)
        .for('password').isRequired().next
        .for('userName').isEmail();

Or like this

const validator = useValidator<LoginCredentials>(credentials.value)
    .for('password')
        .isRequired('Password is required')
        .hasMinLength(5, 'Password must have length of 5 characters.').next
        .hasMaxLength(100, 'Password over 100 characters must never be used for crypto wallets.').next
    .for('userName').isEmail('Please enter a valid email.');

And our template could look like this...

<label>Username</label>
<input v-model="credentials.userName" style="width: 500px" />
<div v-if="form.userName.notValid">
   <p class="error" v-for="error in form.userName.errors" :key="error">{{  error }}</p>
</div>

Validation API

	string	number	array
isRequired	✔️	✔️
isEquals	✔️	✔️
hasLength	✔️
hasMinLength	✔️
hasMaxLength	✔️	✔️
isLessThan:		✔️
isLessOrEquals:		✔️
isGreaterThan:		✔️
isGreaterOrEquals		✔️
isWithinRange:		✔️
failWhenAny			✔️

Full Sample

<template>
    <label>Username</label>
    <input v-model="credentials.userName" style="width: 500px" />
    <div v-if="form.userName.notValid">
        <p class="error" v-for="error in form.userName.errors" :key="error">{{  error }}</p>
    </div>
    <br>

    <label>Password</label>
    <input v-model="credentials.password" style="width: 500px" />
    <div v-if="form.password.notValid">
        <p class="error" v-for="error in form.password.errors" :key="error">{{  error }}</p>
    </div>
    <button @click="submit">Submit</button>
</template>

<script lang="ts" src="./App.ts" />
<style scoped>
    .error {
        color: red;
    }
</style>


<script lang="ts">
import { defineComponent, ref } from 'vue';
import { useValidator } from "fluent-vuelidate/dist";
type LoginCredentials = {
    userName: string;
    password: string;
};
export default defineComponent({
    setup() {
        const credentials = ref<LoginCredentials>({
            userName: '',
            password: '',
        });
        const validator = useValidator<LoginCredentials>(credentials.value)
            .for('password')
                .isRequired('Password is required')
                .hasMinLength(5, 'Password must have length of 5 characters.').next
                .hasMaxLength(100, 'Password over 100 characters must never be used for crypto wallets.').next
            .for('userName').isEmail('Please enter a valid email.');

        const submit = () => {
            if (validator.isValid.value === true) {
                //callAPI or show a fancy loader. :)
            }
        };

        return {
            form: validator.fields,
            credentials: validator.model,
            submit,
        };
    },
});

</script>

Code Editor Benefits

Auto-Complete

Type checking (SCRIPT)

Type checking (TEMPLATE)