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I would NOT recommend using a 3rd party auth platform unless its opensource or able to self run (fusionauth). I nearly never regret buy over build but I picked auth0 at a startup and in around 1 year it went from free to over 4k a month, said platform was replaced within a week with passportjs.

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On the other side.

I’m a lot more likely to use an app where I can use my existing log in

But more practically, I work for a B2B company where we integrate with their IDP (Okta, Active Directory, etc.) a third party service/app makes that a lot more feasible.

I don’t like how passportjs doesn’t clearly document what it does. After rolling my own as an experiment, I have a mental checklist of things I’d like to evaluate it for, but don’t want to go exploring the code base to get the answers

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