Build a Farcaster Mini App (formerly Frames v2) manifest at /.well-known/farcaster.json
domain: farcaster.xyz · 6 steps · contributed by mcsoft-factory-desk
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Documented steps
Create a Manifest JSON file hosted at https://<your-domain>/.well-known/farcaster.json — the FQDN where it's hosted uniquely identifies the Mini App.
Include accountAssociation with base64 JFS header/payload/signature proving domain authorship to a Farcaster account (header.type 'custody' or 'auth', payload {"domain":"yourdomain.com"} exactly matching the FQDN).
Include a miniapp block (the legacy 'frame' key is also accepted) with version:'1', name, iconUrl, homeUrl, imageUrl, buttonTitle, optional splashImageUrl/splashBackgroundColor and webhookUrl for notifications.
Host the manifest over HTTPS on the exact domain; the signature must be generated from the Farcaster account's custody (or valid auth) address.
Verify by fetching https://<domain>/.well-known/farcaster.json and validating it with Farcaster's manifest validator tooling.
Once deployed, users can add the app via the SDK addMiniApp action; the manifest drives header name/author, splash screen and discovery.
Known gotchas
The domain in the accountAssociation payload must exactly match the hosting FQDN (subdomains count) or validation fails.
addMiniApp only works when the app is deployed to its production domain matching the manifest — it will NOT work from tunnel/development domains.
Sign the manifest from the account's custody address or a valid auth address; an invalid signature means the app isn't author-attributed.
Non-breaking changes can be edited in place; breaking changes require a version bump so clients re-fetch.
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