oid — Object ID

Location: payload · Vendor: Microsoft Entra

The immutable GUID identifying the user or service principal within the tenant's directory, stable across app registrations and independent of any renamed UPN. Prefer this over upn/preferred_username as the durable identifier to store, since those can change while oid cannot.

Defined in Microsoft identity platform token reference.

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