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Manage environment variables in Node.js using a `.env` file and the `dotenv` package. Install it with `npm install dotenv` and require it at the beginning of your application with `require('dotenv').config()`. Define variables in `.env` like `PORT=3000` and access them using `process.env.PORT`. This approach helps keep sensitive information and configuration separate from code.

Managing different environments in React Native typically involves using configuration files and environment variables. Libraries like `react-native-config` allow you to define environment-specific variables and load them based on the build configuration. You can use these variables to switch between different API endpoints or feature flags for development, staging, and production environments.

AWS CodeDeploy is a deployment service that automates the process of deploying code changes to Amazon EC2 instances, AWS Lambda functions, and on-premises servers. It supports rolling deployments, blue-green deployments, and canary releases, allowing for controlled and reliable application updates. CodeDeploy integrates with other AWS services such as CodePipeline and CodeCommit, providing a seamless CI/CD experience. It includes features for monitoring deployments, handling rollback scenarios, and managing deployment configurations, helping ensure smooth and consistent application updates across your infrastructure.

An Invalid Path Variable error occurs when a path variable in a URL does not match the expected format or value. Verify that path variables are correctly formatted and correspond to the expected values in routing configurations. Implement validation to ensure that variables meet expected criteria.

Tailoring content for different social media platforms involves understanding each platform’s unique features and audience preferences. For example, use visually engaging content on Instagram, professional updates on LinkedIn, and concise, timely updates on Twitter. Adjust the tone, format, and style of content to fit the platform’s culture and best practices, ensuring maximum relevance and engagement.

Environment variables in Node.js can be accessed via process.env. These variables allow you to configure application settings such as API keys or database URLs without hardcoding sensitive information. Example: Accessing an environment variable using process.env.DB_URL in the code.

Use the `dotenv` package to manage environment variables. Install it with `npm install dotenv`. Create a `.env` file with variables like `PORT=3000`, and access them with `process.env.PORT` in your code.

You can deploy Next.js applications using platforms like Vercel, which provides seamless integration with Next.js. Alternatively, you can deploy to platforms like Netlify, AWS, or traditional servers by exporting static files or using Docker. Example: Vercel offers an easy one-click deploy option for Next.js apps with GitHub integration.

Next.js supports global CSS, CSS modules, and third-party libraries like Tailwind CSS or styled-components. CSS modules provide locally scoped styles by default, ensuring no conflicts. Example: You can import global CSS in `_app.js` or use `module.css` for scoped styles to components.