<@498057949541826571> Why do I always get a new de...
# support-questions-legacys
saurabh_works
06/05/2022, 5:13 PM@rp_st Why do I always get a new device Id (and pre-auth id) for passwordless (OTP) login even if I'm using the same device?
r
rp_st
06/05/2022, 5:13 PMHey
rp_st
06/05/2022, 5:14 PMCause each passwordless auth attempt is essentially stateless
rp_st
06/05/2022, 5:15 PMThese are IDs that are meaningful only in that passwordless login session. The next time you sign in, it’s like a new passwordless auth session. So new IDs
s
saurabh_works
06/05/2022, 5:16 PMso if I want something like whatsapp - can only use my app on one device at a time. how can I do that ?
r
rp_st
06/05/2022, 5:17 PMRight. In that case, you can override the createNewSession function on the backend and check how many sessions exist for the input.userId
rp_st
06/05/2022, 5:17 PMIf more than 0 sessions exist, you can throw an error and deny login
rp_st
06/05/2022, 5:17 PMOr, you can revoke the existing session and go ahead and create a new one
s
saurabh_works
06/05/2022, 5:18 PMoh okay. can share some reference for this?
r
rp_st
06/05/2022, 5:18 PMWhich backend SDK?
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saurabh_works
06/05/2022, 5:18 PMnodejs
r
rp_st
06/05/2022, 5:19 PMfunction to check how many session exists for a user: https://supertokens.com/docs/nodejs/modules/recipe_session.html#getAllSessionHandlesForUser-1
rp_st
06/05/2022, 5:19 PMFunction to revoke a session: https://supertokens.com/docs/nodejs/modules/recipe_session.html#revokeSession-1
rp_st
06/05/2022, 5:20 PMSee this as well - it shows code for the exact use case: https://supertokens.com/docs/session/advanced-customizations/apis-override/custom-response/throwing-error#step-1
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saurabh_works
06/05/2022, 5:30 PMthanks
saurabh_works
06/06/2022, 3:49 AM@fabioaguiar2653 check this
f
fabioaguiar2653
06/06/2022, 3:51 AMIt seams perfect. Tks @rp_st
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