The buffer.write method in Node.js writes the string into the buffer as bytes and returns the number of bytes written. It's essential to understand that it deals with bytes, not characters, bits, or other units of data.

In a document-oriented NoSQL database, the "schema" defines the structure and data types of the documents within the database. Unlike traditional relational databases, NoSQL databases like MongoDB are schema-less, but they still rely on a flexible schema to define the structure of documents.

An appropriate use case for using a NoSQL database over a SQL database is real-time analytics on large datasets. NoSQL databases are often better suited for handling unstructured or semi-structured data at scale, making them a good fit for analytics. The other options are typically better handled by SQL databases.

OAuth 2.0 is a widely adopted authentication strategy for securing APIs accessed by various clients. It provides security features such as token-based authentication, authorization, and is suitable for both web clients and services. JWT is a token format and not an authentication strategy on its own. Basic Authentication and API Keys have limitations in terms of security and scalability.

In Express.js, the all() method is used to handle all HTTP methods (GET, POST, PUT, DELETE, etc.) for a specific route. It is equivalent in functionality to the any() method. The use() and match() methods do not provide the same functionality.

The Event Loop in Node.js handles asynchronous tasks by adding them to a queue and executing them in a non-blocking manner. It ensures that asynchronous tasks are processed in the background without pausing the main thread, allowing Node.js to remain responsive. The other options do not accurately describe how asynchronous tasks are handled by the Event Loop.

To resolve conflicts between different versions of the same package required by different dependencies, you can manually specify the version of the package in your project's package.json file using the "dependencies" section. This allows you to enforce a specific version and avoid conflicts. Updating all dependencies may introduce compatibility issues and is not recommended. Switching to a different package manager or deleting the package are not typically the best solutions.

Integration testing focuses on the dependencies between different components of the application. It ensures that these components work together as expected. While interactions and behavior are important aspects, they are not the primary focus of integration testing. Functions are a narrower concept and do not encompass all aspects of integration.

In Node.js, the global object is a global context object that contains various properties and methods available throughout the application. globalThis is a reference to the global object, which allows cross-environment compatibility. console, module, and require are not properties of the global object but are commonly used in Node.js for various purposes.

The primary difference is that OAuth 1.0 requires client registration, while OAuth 2.0 does not. OAuth 2.0 introduced a more streamlined and flexible approach to authorization. The other options describe differences but not the primary distinction.