OTP Session Management Best Practices (2026)
How to manage sessions before, during and after OTP verification. Partial sessions, signed cookies, JWT vs server-side sessions, and idle vs absolute timeouts.
StartMessaging Team
Engineering
Session management around OTP has three phases: pre-verify partial session, the verify-itself transaction, and the post-verify long-lived session. Each has its own rules.
Three Session Phases
- Pre-verify: holds requestId only, 15-min TTL.
- Verify: short transaction, no new session.
- Post-verify: long-lived session with role + expiry.
Partial Session (Pre-Verify)
- HTTP-only cookie or short-lived JWT.
- Holds the OTP requestId, not user identity yet.
- 15-minute TTL aligned with OTP expiry.
Verified Session
- Issue after successful verify.
- Bind to user ID, device fingerprint, role.
- Set idle and absolute timeouts.
Cookies vs JWT
- Server-side sessions: revocable, simpler, slightly more state.
- JWT: stateless, harder to revoke, beware of long expiry.
- Most consumer apps use signed-cookie sessions; SaaS APIs use short-lived JWT + refresh.
Idle vs Absolute Timeouts
- Idle: time since last interaction.
- Absolute: time since session creation.
- Both checked on every request.
FAQ
Tie session expiry to action sensitivity: read-only sessions can live longer than write-capable ones.
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