How can I secure my Node.js API?

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Grade: Education Subject: Support
How can I secure my Node.js API?
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API security measures include authentication (verifying the identity of the client) and authorization (determining what resources the client has access to). Common authentication methods include API keys, JWT (JSON Web Tokens), and OAuth. You should also implement input validation, protect against common attacks like SQL injection and cross-site scripting (XSS), and regularly update your dependencies.