Frontend Development

Frappe Frontend Development

Build modern frontend applications using Frappe UI (Vue 3 + TailwindCSS) and portal pages.

When to use

• Building a custom SPA frontend for a Frappe app
• Using Frappe UI components (Button, Dialog, ListView, etc.)
• Implementing data fetching with Resource, ListResource, DocumentResource
• Creating portal/public-facing pages
• Setting up Vue 3 frontend tooling inside a Frappe app

Inputs required

• App name and whether frontend already exists
• Frontend type (full SPA via Frappe UI, or portal pages)
• Authentication requirements (logged-in users, guest access)
• Key components and data resources needed

Procedure

0) Choose frontend approach

1) Scaffold Frappe UI frontend

# Inside your Frappe app directory
cd apps/my_app
npx degit frappe/frappe-ui-starter frontend

# Install dependencies
cd frontend
yarn

# Start dev server
yarn dev

2) Configure main.js

import { createApp } from 'vue'
import {
    FrappeUI,
    setConfig,
    frappeRequest,
    resourcesPlugin,
    pageMetaPlugin
} from 'frappe-ui'
import App from './App.vue'
import './index.css'

let app = createApp(App)

// Register FrappeUI plugin (components + directives)
app.use(FrappeUI)

// Enable Frappe response parsing
setConfig('resourceFetcher', frappeRequest)

// Optional: Options API resource support
app.use(resourcesPlugin)

// Optional: Reactive page titles
app.use(pageMetaPlugin)

app.mount('#app')

3) Fetch data with Resources

Generic Resource — for custom API calls:

import { createResource } from 'frappe-ui'

let stats = createResource({
    url: 'my_app.api.get_dashboard_stats',
    params: { period: 'monthly' },
    auto: true,
    cache: 'dashboard-stats',
    transform(data) {
        return { ...data, formatted_total: format_currency(data.total) }
    },
    onSuccess(data) { console.log('Loaded:', data) },
    onError(error) { console.error('Failed:', error) }
})

// Properties
stats.data       // Response data
stats.loading    // Boolean: request in progress
stats.error      // Error object if failed
stats.fetched    // Boolean: data fetched at least once

// Methods
stats.fetch()    // Trigger request
stats.reload()   // Re-fetch
stats.submit({ period: 'weekly' })  // Fetch with new params
stats.reset()    // Reset state

List Resource — for DocType lists with pagination:

import { createListResource } from 'frappe-ui'

let todos = createListResource({
    doctype: 'ToDo',
    fields: ['name', 'description', 'status'],
    filters: { status: 'Open' },
    orderBy: 'creation desc',
    pageLength: 20,
    auto: true,
    cache: 'open-todos'
})

// List-specific API
todos.data              // Array of records
todos.hasNextPage       // Boolean: more pages
todos.next()            // Load next page
todos.reload()          // Refresh list

// CRUD operations
todos.insert.submit({ description: 'New task' })
todos.setValue.submit({ name: 'TODO-001', status: 'Closed' })
todos.delete.submit('TODO-001')
todos.runDocMethod.submit({ method: 'send_email', name: 'TODO-001' })

Document Resource — for single document operations:

import { createDocumentResource } from 'frappe-ui'

let todo = createDocumentResource({
    doctype: 'ToDo',
    name: 'TODO-001',
    whitelistedMethods: {
        sendEmail: 'send_email',
        markComplete: 'mark_complete'
    },
    onSuccess(doc) { console.log('Loaded:', doc.name) }
})

// Document API
todo.doc                 // Full document object
todo.reload()            // Refresh document

// Update fields
todo.setValue.submit({ status: 'Closed' })

// Debounced update (coalesces rapid changes)
todo.setValueDebounced.submit({ description: 'Updated' })

// Call whitelisted methods
todo.sendEmail.submit({ email: 'user@example.com' })

// Delete
todo.delete.submit()

4) Use Frappe UI components

<template>
    <div class="p-4">
        <Button variant="solid" theme="blue" @click="showDialog = true">
            Add Todo
        </Button>

        <ListView :columns="columns" :rows="todos.data">
            <template #cell="{ column, row, value }">
                <Badge v-if="column.key === 'status'" :theme="value === 'Open' ? 'orange' : 'green'">
                    {{ value }}
                </Badge>
                <span v-else>{{ value }}</span>
            </template>
        </ListView>

        <Dialog v-model="showDialog" :options="{ title: 'New Todo' }">
            <template #body-content>
                <TextInput v-model="newDescription" placeholder="Description" />
            </template>
            <template #actions>
                <Button variant="solid" @click="addTodo">Save</Button>
            </template>
        </Dialog>
    </div>
</template>

<script setup>
import { ref } from 'vue'
import { Button, ListView, Badge, Dialog, TextInput, createListResource } from 'frappe-ui'

const showDialog = ref(false)
const newDescription = ref('')

const todos = createListResource({
    doctype: 'ToDo',
    fields: ['name', 'description', 'status'],
    auto: true
})

const columns = [
    { label: 'Description', key: 'description' },
    { label: 'Status', key: 'status', width: 100 }
]

function addTodo() {
    todos.insert.submit(
        { description: newDescription.value },
        { onSuccess() { showDialog.value = false; newDescription.value = '' } }
    )
}
</script>

Available component categories:

5) Add directives and utilities

<script setup>
import { onOutsideClickDirective, visibilityDirective, debounce } from 'frappe-ui'

const vOnOutsideClick = onOutsideClickDirective
const vVisibility = visibilityDirective

const debouncedSearch = debounce((query) => {
    // Search logic
}, 500)
</script>

<template>
    <div v-on-outside-click="closeDropdown">...</div>
    <div v-visibility="onVisible">Lazy loaded content</div>
</template>

6) Configure TailwindCSS

// tailwind.config.js
module.exports = {
    presets: [
        require('frappe-ui/src/utils/tailwind.config')
    ],
    content: [
        './index.html',
        './src/**/*.{vue,js,ts}',
        './node_modules/frappe-ui/src/components/**/*.{vue,js,ts}'
    ]
}

7) Build for production

# Build frontend assets
cd frontend && yarn build

# Assets are served at /frontend by Frappe

8) Portal pages (alternative approach)

For simple public pages without a full SPA:

# In your app's website/ or www/ directory
# my_app/www/my_page.html

{% extends "templates/web.html" %}
{% block page_content %}
<h1>{{ title }}</h1>
<p>Welcome, {{ frappe.session.user }}</p>
{% endblock %}

# my_app/www/my_page.py
def get_context(context):
    context.title = "My Page"
    context.data = frappe.get_all("ToDo", filters={"owner": frappe.session.user})

Verification

• yarn dev starts without errors
• Components render correctly
• Data resources fetch and display data
• CRUD operations work (insert, update, delete)
• Authentication works (login redirect, session handling)
• yarn build completes successfully
• Production assets serve correctly from Frappe

Failure modes / debugging

• CORS errors: Set ignore_csrf for local dev; ensure proper CSRF token in production
• 404 on API calls: Check method path; verify @frappe.whitelist() decorator
• Component not found: Ensure import path is correct; check frappe-ui version
• Styles broken: Verify TailwindCSS config includes frappe-ui component paths
• Auth issues: Check session cookie; ensure site URL matches in dev proxy config

Escalation

• For Desk UI scripting → desk-customization
• For API endpoint implementation → api-development
• For app architecture → app-development
• For UI/UX patterns from official apps → ui-patterns

References

• references/frappe-ui.md — Frappe UI framework reference
• references/portal-development.md — Portal pages overview

Guardrails

• ALWAYS use Frappe UI for custom frontends: Never use vanilla JS, jQuery, or custom frameworks for app frontends — Frappe UI (Vue 3 + TailwindCSS) is the standard. This ensures consistency with CRM, Helpdesk, and other official Frappe apps.
• Use FrappeUI components: Prefer <Button>, <Input>, <FormControl> over custom HTML for consistency
• Follow CRM/Helpdesk app shell patterns: For CRUD apps, follow ui-patterns skill which documents sidebar navigation, list views, form layouts, and routing patterns from official Frappe apps
• Handle loading states: Always show loading indicators during API calls; use resource.loading
• Validate API responses: Check for errors before accessing data; handle exc responses
• Configure proxy correctly: Dev server must proxy API calls to Frappe backend
• Handle authentication: Check $session.user and redirect to login when needed

Common Mistakes