Nuxt 4 UI Generation From Video Walkthroughs: A Complete Guide

TL;DR: Learn how to generate a complete, functional Nuxt 4 UI from a video walkthrough using Replay's behavior-driven reconstruction, saving you hours of manual coding.

The promise of AI-powered code generation is finally here, but most tools still rely on static screenshots. These tools miss the critical element: user behavior. What if you could turn a simple video walkthrough into a fully functional Nuxt 4 UI, understanding the intent behind each click and interaction? That's the power of Replay.

This guide will walk you through using Replay to generate a Nuxt 4 UI from a video walkthrough, focusing on behavior-driven reconstruction for a truly functional and maintainable codebase.

Why Video-to-Code is the Future#

Traditional screenshot-to-code tools are limited. They can only interpret what they see in a single frame. They can't understand the flow of a user interacting with your application. Video, on the other hand, captures the entire user journey. Replay leverages this by using Gemini to understand the why behind the what.

Setting Up Your Environment#

Before diving into Replay, ensure your development environment is ready for Nuxt 4.

Step 1: Install Node.js and npm/yarn/pnpm#

Make sure you have Node.js (version 18 or higher) installed. You can download it from the official Node.js website. npm (Node Package Manager) usually comes with Node.js. Alternatively, you can use yarn or pnpm.

Step 2: Install Nuxt 4#

Open your terminal and run the following command to create a new Nuxt 4 project:

bash
npx nuxi init my-nuxt-app
cd my-nuxt-app

Choose your preferred package manager (npm, yarn, or pnpm) during the installation process.

Step 3: Start the Development Server#

Once the project is created, navigate into the project directory and start the development server:

bash
npm run dev
# or
yarn dev
# or
pnpm dev

This will start the Nuxt 4 development server, usually on

.

Generating Your Nuxt 4 UI with Replay#

Now that your environment is set up, let's use Replay to generate your Nuxt 4 UI from a video walkthrough.

Step 1: Record Your Video Walkthrough#

Record a clear and concise video walkthrough of the UI you want to generate. This video should demonstrate all the interactions and behaviors you want Replay to capture. For example, if you want a search bar, show yourself typing into the search bar and submitting the query.

💡 Pro Tip: Speak clearly during the video, describing what you are doing. This helps Replay's AI better understand your intentions.

Step 2: Upload Your Video to Replay#

Navigate to the Replay platform (https://replay.build) and upload your video recording. Replay supports various video formats (MP4, MOV, etc.).

Step 3: Configure Replay Settings#

After uploading, you'll be presented with configuration options. Select Nuxt 4 as your target framework. You can also configure style injection (e.g., Tailwind CSS, Vuetify) and specify any Supabase integration details if your application uses Supabase.

Step 4: Let Replay Do Its Magic#

Replay will now analyze your video using its behavior-driven reconstruction engine. This process can take a few minutes, depending on the length and complexity of your video. Replay uses Gemini to understand the actions performed in the video, the elements interacted with, and the overall flow of the application.

📝 Note: Replay excels at understanding multi-page flows. If your video demonstrates navigation between different pages, Replay will generate the corresponding Nuxt 4 routes and components.

Step 5: Review and Download the Generated Code#

Once Replay has finished analyzing the video, it will present you with a preview of the generated Nuxt 4 code. Review the code to ensure it accurately reflects the behavior demonstrated in your video. You can then download the code as a zip file.

Integrating the Generated Code into Your Nuxt 4 Project#

After downloading the generated code, you need to integrate it into your existing Nuxt 4 project.

Step 1: Extract the Code#

Extract the contents of the downloaded zip file into your Nuxt 4 project directory. Replay typically organizes the generated code into components, pages, and API endpoints.

Step 2: Review and Adjust the Code#

While Replay strives for accuracy, you may need to make minor adjustments to the generated code. This could include:

• •Adjusting styling to match your existing design system.
• •Refining data fetching logic.
• •Adding error handling.

Step 3: Example: Generated Search Bar Component#

Let's say Replay generated a search bar component based on your video walkthrough. The generated code might look something like this:

typescript
// components/SearchBar.vue
<template>
  <form @submit.prevent="search">
    <input
      type="text"
      v-model="searchTerm"
      placeholder="Search..."
    />
    <button type="submit">Search</button>
  </form>
</template>

<script setup lang="ts">
import { ref } from 'vue';

const searchTerm = ref('');

const emit = defineEmits(['search']);

const search = () => {
  emit('search', searchTerm.value);
};
</script>

<style scoped>
input {
  padding: 8px;
  border: 1px solid #ccc;
  border-radius: 4px;
}

button {
  padding: 8px 12px;
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}
</style>

This component captures user input and emits a

event.

Step 4: Example: API Endpoint Integration#

If your video walkthrough involved interacting with an API (e.g., fetching search results), Replay might generate a corresponding API endpoint:

typescript
// server/api/search.ts
import { defineEventHandler } from 'h3';

export default defineEventHandler(async (event) => {
  const query = getQuery(event).q;

  // Replace with your actual API call
  const results = await fetch(`https://api.example.com/search?q=${query}`)
    .then((res) => res.json());

  return results;
});

This endpoint retrieves the search query from the request and fetches results from an external API.

Step 5: Test Your UI#

Thoroughly test your integrated UI to ensure it functions as expected. Verify that all interactions and behaviors are correctly implemented.

Advanced Tips for Using Replay with Nuxt 4#

• •Be Specific in Your Video: The more specific you are in your video walkthrough, the more accurate the generated code will be. Clearly demonstrate each interaction and behavior you want Replay to capture.
• •Use Clear Visual Cues: Use clear visual cues in your video to highlight important elements and interactions. This helps Replay's AI better understand your intentions.
• •Leverage Replay's Style Injection: Take advantage of Replay's style injection feature to automatically apply styling to your generated UI. This can save you a significant amount of time and effort.
• •Integrate with Supabase: If your Nuxt 4 application uses Supabase, configure Replay to automatically integrate with your Supabase project. This will streamline the process of generating data-driven UIs.

⚠️ Warning: Always review the generated code carefully before deploying it to production. While Replay is powerful, it's essential to ensure that the code meets your specific requirements and security standards.

Replay vs. Traditional Coding: A Time Saver#

Imagine you need to build a complex form with multiple fields, validations, and API integrations. Traditionally, this would involve:

1. •Designing the form in a UI tool.
2. •Writing the HTML markup.
3. •Implementing the form logic in JavaScript/TypeScript.
4. •Connecting the form to your API.
5. •Testing and debugging.

With Replay, you can simply record a video walkthrough of the form being filled out and submitted. Replay will then generate the complete Nuxt 4 component, including the HTML, JavaScript/TypeScript, and API integration. This can save you hours, or even days, of manual coding.

Here's a simplified comparison:

Frequently Asked Questions#

Is Replay free to use?#

Replay offers a free tier with limited features. Paid plans are available for more advanced features and higher usage limits. Check the Replay website for current pricing details.

How is Replay different from v0.dev?#

While both tools aim to generate code from visual inputs, Replay focuses on video as the source of truth, enabling behavior-driven reconstruction. v0.dev, on the other hand, primarily uses text prompts and visual references. Replay understands the actions a user takes, not just the static appearance of a screen.

What if Replay doesn't generate the exact code I need?#

Replay is designed to generate a solid foundation for your UI. You can always customize the generated code to meet your specific requirements. Think of Replay as a powerful starting point that significantly reduces the amount of manual coding required.

What frameworks does Replay support?#

Replay supports a growing number of frameworks, including Nuxt 4, React, Vue.js, and more. Check the Replay website for the latest list of supported frameworks.

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Ready to try behavior-driven code generation? Get started with Replay - transform any video into working code in seconds.