firebase — Firebase Metadata

Location: payload · Format: json · Vendor: Firebase

An object carrying Firebase Authentication metadata about the sign-in, including identities (linked provider accounts) and sign_in_provider (e.g. "password", "google.com"). This whole object — not a top-level sign_in_provider claim — is what Firebase actually emits on its ID tokens.

Defined in Firebase Auth ID token structure.

Decode a JWT and inspect its firebase claim in the TokenPrism debugger — free, entirely in your browser.