Full Stack developer interview questions

Git is a distributed version control system that records every change as a commit.

git clone copies a remote repository onto your machine for the first time.

git add stages chosen files so they become part of the next snapshot.

A branch is a movable pointer to a commit, usually used to isolate a feature or bug fix.

.gitignore lists paths Git should not track, such as node_modules, build output, and .env files.

git status shows the branch, staged files, and unstaged edits.

HTTP is a request-response protocol.

GET reads a resource, POST creates one, PUT replaces one, PATCH updates part of one, and DELETE removes one.

GET retrieves data, can be cached, and puts parameters in the URL.

2xx means success, 4xx means the client sent a bad request, and 5xx means the server failed.

HTTPS is HTTP wrapped in TLS, which encrypts data in transit and proves the server identity with a certificate.

Headers are key-value metadata on requests and responses, such as Content-Type, Authorization, Cookie, and Cache-Control.

Path parameters identify a specific resource, such as /users/42.

Node.js is a JavaScript runtime built on V8 that runs outside the browser.

npm is Node's default package manager.

dependencies are packages the app needs at runtime, such as express or mongoose.

JavaScript in Node runs on one main thread, but I/O is offloaded to the system and libuv.

require is CommonJS and loads modules synchronously.

process.env is an object of environment variables available to the process.

Synchronous code finishes before the next line runs and can block the event loop.