Building full-stack Express applications have always involved connecting to a database or external resources that are needed to have functional applications. When connecting to these external resources, we would need a means of verifying our identity before making a successful connection.
We use special secret keys or API keys that are specific to our application to verify our identity. These keys should always be kept secret from the public eye, as the web is an open village, or we stand to lose our application to cybersecurity attacks.
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