How to Convert UX Design Video to React Code with Firebase Auth using Replay AI in 2026

TL;DR: Replay AI leverages video analysis to generate React code with Firebase Auth integration directly from UX design videos, streamlining development and bridging the gap between design and functional implementation.

The future of UI development is here, and it's driven by behavior. Forget static mockups and endless handoff meetings. In 2026, we're converting UX design videos directly into functional React code, complete with Firebase Authentication, using Replay.

Why? Because design videos capture intent. They show the user flow, the interactions, the behavior that static designs often miss. Replay understands this behavior and translates it into production-ready code.

The Problem: Static Designs vs. Dynamic Reality#

Traditional design-to-code workflows are fraught with friction:

• •Misinterpretation: Developers can misinterpret static designs, leading to implementation errors.
• •Communication Overhead: Constant back-and-forth between designers and developers consumes valuable time.
• •Lack of Interactivity: Static designs don't capture the dynamic nature of user interactions.
• •Wasted Effort: Prototypes often require manual coding, duplicating effort.

These issues are amplified when integrating complex features like authentication. Manually wiring up Firebase Auth to a new React component is tedious and error-prone.

The Solution: Behavior-Driven Reconstruction with Replay#

Replay offers a revolutionary approach: Behavior-Driven Reconstruction. Instead of relying on static screenshots, Replay analyzes video to understand user behavior and generate code that reflects that behavior.

Here's how it works:

1. •Record: Capture a video of your UX design prototype in action. This video should clearly demonstrate the user flow, including interactions with authentication features.
2. •Upload: Upload the video to Replay.
3. •Analyze: Replay's AI engine, powered by Gemini, analyzes the video, identifies UI elements, and understands the intended user behavior.
4. •Generate: Replay generates clean, functional React code, complete with Firebase Authentication integration.
5. •Customize: Fine-tune the generated code to match your specific requirements.

Step-by-Step Guide: Converting a UX Video to React Code with Firebase Auth#

Let's walk through a practical example: converting a UX design video of a login/registration flow into functional React code with Firebase Auth.

Step 1: Prepare Your UX Design Video#

Your video should clearly demonstrate the following:

• •The registration process (entering email, password, etc.).
• •The login process.
• •Error handling (e.g., invalid credentials).
• •Navigation after successful login.

💡 Pro Tip: Speak clearly while recording the video, describing your actions and the intended behavior. This helps Replay's AI better understand the context.

Step 2: Set Up Your Firebase Project#

1. •Create a new Firebase project in the Firebase Console.
2. •Enable the Authentication service.
3. •Configure the "Email/Password" sign-in method.
4. •Get your Firebase configuration object. This will be used in the generated React code.

javascript
// Example Firebase configuration object
const firebaseConfig = {
  apiKey: "YOUR_API_KEY",
  authDomain: "YOUR_AUTH_DOMAIN",
  projectId: "YOUR_PROJECT_ID",
  storageBucket: "YOUR_STORAGE_BUCKET",
  messagingSenderId: "YOUR_MESSAGING_SENDER_ID",
  appId: "YOUR_APP_ID"
};

Step 3: Upload Your Video to Replay#

1. •Log in to your Replay account (https://replay.build).
2. •Click the "Create New Project" button.
3. •Select "Upload Video" and choose your UX design video file.
4. •Provide a project name and description.
5. •Select "React" as the target framework and "Firebase Auth" as the authentication provider.

Step 4: Let Replay Analyze and Generate Code#

Replay will now analyze your video and generate the React code. This process may take a few minutes depending on the length and complexity of the video.

Step 5: Review and Customize the Generated Code#

Once the code generation is complete, you'll be presented with a preview of the generated React components.

1. •Review: Carefully review the code to ensure it accurately reflects the intended behavior. Pay close attention to the Firebase Auth integration.
2. •Customize: Use Replay's built-in code editor to make any necessary adjustments. You can modify the styling, add custom logic, or refine the Firebase Auth integration.

Here's an example of a generated React component for user registration:

typescript
// Generated by Replay
import React, { useState } from 'react';
import { initializeApp } from 'firebase/app';
import { getAuth, createUserWithEmailAndPassword } from 'firebase/auth';

const firebaseConfig = {
  // Your Firebase config here (replace placeholders)
  apiKey: "YOUR_API_KEY",
  authDomain: "YOUR_AUTH_DOMAIN",
  projectId: "YOUR_PROJECT_ID",
  storageBucket: "YOUR_STORAGE_BUCKET",
  messagingSenderId: "YOUR_MESSAGING_SENDER_ID",
  appId: "YOUR_APP_ID"
};

const app = initializeApp(firebaseConfig);
const auth = getAuth(app);

const RegistrationForm = () => {
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');
  const [error, setError] = useState('');

  const handleSubmit = async (e) => {
    e.preventDefault();
    setError('');
    try {
      await createUserWithEmailAndPassword(auth, email, password);
      // Registration successful - redirect or display success message
      console.log('Registration successful!');
    } catch (error: any) {
      setError(error.message);
    }
  };

  return (
    <form onSubmit={handleSubmit}>
      {error && <p style={{ color: 'red' }}>{error}</p>}
      <label>
        Email:
        <input type="email" value={email} onChange={(e) => setEmail(e.target.value)} />
      </label>
      <label>
        Password:
        <input type="password" value={password} onChange={(e) => setPassword(e.target.value)} />
      </label>
      <button type="submit">Register</button>
    </form>
  );
};

export default RegistrationForm;

⚠️ Warning: Always double-check the generated Firebase configuration and ensure it's securely stored. Avoid committing your API keys directly to your codebase.

Step 6: Integrate the Generated Code into Your Project#

1. •Download the generated code as a zip file.
2. •Extract the files and copy them into your React project.
3. •Install any necessary dependencies (e.g.,
   text

   @firebase/app
   ,
   text

   @firebase/auth
   ).
4. •Import and use the generated components in your application.

Key Benefits of Using Replay#

• •Accelerated Development: Significantly reduces the time required to convert designs into functional code.
• •Improved Accuracy: Minimizes misinterpretations and ensures the code accurately reflects the intended user behavior.
• •Enhanced Collaboration: Streamlines communication between designers and developers.
• •Automated Firebase Auth Integration: Simplifies the process of adding authentication to your React applications.
• •Behavior-Driven Development: Shifts the focus from static designs to dynamic user interactions.
• •Multi-page Generation: Generate code for entire user flows, not just single screens.

Beyond the Basics: Advanced Replay Features#

Replay offers a range of advanced features to further enhance your development workflow:

• •Style Injection: Automatically apply styles from your design system to the generated components.
• •Supabase Integration: Generate code that integrates with Supabase, an open-source Firebase alternative.
• •Product Flow Maps: Visualize the entire user journey reconstructed from the video, making it easier to understand and modify complex flows.

📝 Note: Replay continuously evolves, adding support for new frameworks, authentication providers, and advanced features. Stay tuned for future updates!

Frequently Asked Questions#

Is Replay free to use?#

Replay offers a free tier with limited features and usage. Paid plans are available for more advanced features and higher usage limits. Check the Replay website for the most up-to-date pricing information.

How is Replay different from v0.dev?#

v0.dev generates UI components based on text prompts. Replay, on the other hand, generates code from video recordings of UX designs, capturing the dynamic behavior and user interactions that text prompts often miss. Replay focuses on behavior-driven reconstruction, making it ideal for complex user flows and applications that require a high degree of accuracy.

What if Replay doesn't perfectly capture the design from the video?#

The generated code serves as a strong starting point. Replay provides a code editor for easy customization. It's about accelerating development, not eliminating the developer.

What types of videos work best with Replay?#

Videos that clearly demonstrate the user flow, interactions, and intended behavior work best. Ensure the video is well-lit, and the UI elements are clearly visible. Speaking clearly while recording the video also helps Replay's AI understand the context.

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