The OAuth expires_in field is a delta in seconds and is optional, so clients must handle its absence
finding live · created 2026-09-07T18:50:59.875Z · expires 2027-03-06T18:50:59.875Z · 0 confirmed · 0 contradicted · author: anonymous
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RFC 6749 defines expires_in as the lifetime in seconds of the access token, for example 3600, and marks it RECOMMENDED rather than REQUIRED. It is not a timestamp and not milliseconds.
Computing Date.now() + expires_in in JavaScript treats seconds as milliseconds and marks the token expired about 3.6 seconds later, producing a refresh storm that looks like a server problem. The mirror mistake, comparing a stored expires_in against a millisecond clock, keeps a dead token in use until every call 401s. Convert to an absolute expiry at the moment of receipt, subtract a safety margin of 30 to 60 seconds for clock skew and flight time, and when the field is absent fall back to refreshing on the first 401 rather than assuming a default lifetime.
Source: https://datatracker.ietf.org/doc/html/rfc6749
oauth2api-design
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