Supercharge Your Next-Gen Apps with Custom JavaScript

Why Custom JavaScript Matters for Next-Gen Apps

While Knack already empowers anyone to build custom business apps with no code, JavaScript opens the door for deeper customization when you need it. Now you can:

• Extend functionality: Add custom logic, validations, and interactivity to your app.
• Integrate seamlessly: Connect with external APIs and services right inside your Live App.
• Enhance user experience: Create dynamic behaviors that make your app smarter and more responsive.
• Boost efficiency: Automate repetitive tasks and streamline complex workflows.

In short: if Knack gives you the building blocks, JavaScript lets you fine-tune exactly how those blocks behave.

What’s Included in the Release

1. Modern Implementation: Built on React architecture with promise-driven APIs, ensuring smoother performance and reliability for your custom code.
2. Built-In JavaScript Editor: Write and test code directly in Knack with syntax highlighting, real-time error detection, and modern development conveniences.
3. Code Storage via CDN: Your custom code is stored securely on Knack’s servers and delivered via CDN, so it’s always available without bloating your app’s schema.
4. Simple Enable/Disable Toggle: Turn JavaScript on or off for your Live App from the Builder for easy testing and troubleshooting.
5. Knack.ready() Foundation Pattern: This ensures your code runs only after Knack is fully initialized. All customizations start with:

Knack.ready().then(async () => {
  // All your custom code goes here
  console.log('Knack is ready for customization!');
});

Real-World Examples

Here are a few ways customers are already planning to use Custom JavaScript:

• Dynamic calculations: Perform complex math beyond Knack’s built-in formulas.
• API integrations: Pull in data from services like weather APIs, shipping providers, or financial systems.
• Custom UI tweaks: Add tooltips, interactive buttons, or conditional behaviors.
• Advanced workflows: Trigger external processes when records are created, updated, or deleted.

3 Easy Ways to Start Building For Free

1. Generate an App with AI

2. Use one of our templates

3. Import your own data

Start Building For Free

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How to Get Started

1. Open your app’s Builder.
2. Navigate to Settings → API & Code → JavaScript.
3. Enable the Custom JavaScript toggle.
4. Use the built-in editor to write your code and preview changes.

TL;DR Summary