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NodeJS Pertanyaan dan Jawaban Wawancara

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Ques 1. What is Node.js?

Node.js is an open-source, cross-platform JavaScript runtime environment that executes JavaScript code server-side.

Example:

console.log('Hello, Node.js!');

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Ques 2. Explain the event-driven architecture in Node.js.

Node.js follows an event-driven, non-blocking I/O model. It means that the server can handle multiple connections simultaneously, and when an event occurs, the corresponding callback function is executed.

Example:

const server = require('http').createServer((req, res) => { /* handle request */ });

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Ques 3. What is npm?

npm (Node Package Manager) is the default package manager for Node.js, used to manage and distribute Node.js packages/modules.

Example:

npm install package_name

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Ques 4. Explain the concept of middleware in Express.js.

Middleware functions are functions that have access to the request, response, and next middleware function in the applicationâ€™s request-response cycle. They can modify the request and response objects or end the request-response cycle.

Example:

app.use((req, res, next) => { /* middleware logic */ next(); });

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Ques 5. What is the purpose of package.json in Node.js?

package.json is a manifest file that contains metadata about a Node.js project, including dependencies, scripts, and other project-specific configurations.

Example:

npm init

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