Why I should not use Firebase?

The problem of data migration With Firebase, you can’t deal easily with data-migration like you can do with a simple SQL database. Firebase uses JSON and there are almost no features SQL features, so you wouldn’t be able to migrate from the existing database easily.28 Kas 2017

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Is Firebase good for big applications?

Conclusion: If you’re building something cool and needs a fast, reliable database, user authentication and usage tracking, then Firebase is a great way to go. Not recommend for complex project . Large application, very few people use serverless, if you do not want later to pay expensive to sit back.28 Kas 2017

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