Firebase Auth Duplicate Email Error: How to Fix It Step-by-Step

This page summarizes the projects mentioned and recommended in the original post on dev.to
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SurveyJS: Build JSON-Driven Surveys and Forms with Full Data Control
Add the SurveyJS UI components to your JS app (React/Angular/Vue3). Securely collect and analyze data without sending it to 3rd-party servers. Fully customizable, works with any backend, and ideal for data-heavy apps. Learn more.
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Stream - Scalable APIs for Chat, Feeds, Moderation, & Video.
Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
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  1. Next.js

    The React Framework

    While building a Next.js app with Firebase Authentication (email/password), I encountered a frustrating issue — users could sign up multiple times with the same email address, creating duplicate entries in my Firestore database.

  2. SurveyJS

    SurveyJS: Build JSON-Driven Surveys and Forms with Full Data Control. Add the SurveyJS UI components to your JS app (React/Angular/Vue3). Securely collect and analyze data without sending it to 3rd-party servers. Fully customizable, works with any backend, and ideal for data-heavy apps. Learn more.

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  3. firebase-js-sdk

    Firebase Javascript SDK

    Even though Firebase Auth is supposed to prevent duplicate emails automatically, I was still seeing duplicates. After digging through GitHub issues and Reddit discussions, I realized this problem has been around for a while.

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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