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base44

base44 generates React SPAs (Vite + Tailwind) with Deno-powered serverless backend functions, and stores credentials in the Secrets panel.

What you'll add​

UK and international address autocomplete on any address form, powered by the Address Finder widget — UK lookups are backed by the Royal Mail PAF dataset. For UK-only postcode → address dropdowns, use Postcode Lookup instead.

1. Get an API key​

2. Store the key in base44​

In your base44 app:

  1. Open Dashboard → Secrets.
  2. Add a secret named IDEAL_POSTCODES_API_KEY with your ak_… value.
  3. Save.

Or ask the base44 chat: "Add a Secret named IDEAL_POSTCODES_API_KEY and prompt me for the value."

3. Starter prompt​

Paste this into the base44 chat:

Add UK and international address autocomplete to the address form using
@ideal-postcodes/address-finder.

- Install the npm package.
- Mount AddressFinder.setup() on the address line 1 input. Populate
  line2, post_town and postcode from the callback.
- Read the API key from the IDEAL_POSTCODES_API_KEY Secret.
- After deploying, print the app's origin in chat so I can add it to
  the key's Allowed URLs.
- Reference docs: https://docs.ideal-postcodes.co.uk/docs/address-finder.md

4. Lock down the key​

Browser keys are public — Allowed URLs is the lock. After deploy, add both origins to your key:

  • The base44 preview: https://<your-app>.base44.app
  • Your custom domain, if attached (Builder plan and above)

Forgetting the custom domain returns silent 401s only on the published site — preview keeps working, which is the most confusing failure on this platform.

Need help?​