Webskitters Junior Application Developer Interview Questions, Process, and Tips

To fetch data from MongoDB, use the find() method with optional query parameters.

• Use the find() method to retrieve data from a MongoDB collection

• You can pass query parameters to filter the results

• Use the findOne() method to retrieve a single document

Node.js is a runtime environment that allows you to run JavaScript on the server side.

• Node.js uses an event-driven, non-blocking I/O model, making it lightweight and efficient.

• It is commonly used for building server-side applications, APIs, and real-time applications.

• Node.js is built on the V8 JavaScript engine and uses an event loop to handle asynchronous operations.

Middleware is software that acts as a bridge between different applications or components, allowing them to communicate and work together.

• Middleware facilitates communication between different software components

• It can handle tasks such as data transformation, security, and routing

• Examples include message brokers like RabbitMQ, API gateways like Kong, and web servers like Apache Tomcat

req and res are commonly used abbreviations for request and response objects in web development.

• req stands for request object, which contains information about the incoming HTTP request from the client.

• res stands for response object, which is used to send back a response to the client based on the request.

• In Node.js, req and res are often used in Express.js framework for handling HTTP requests and responses.

To upload a file to a server, you can use a form with a file input field or use a server-side script to handle the file upload process.

• Create a form with a file input field in HTML.

• Use a server-side script (e.g. PHP, Node.js) to handle the file upload process.

• Validate the file type and size before uploading.

• Move the uploaded file to a designated folder on the server.

• Provide feedback to the user after the file has been

Mongoose provides a schema-based solution for modeling data in MongoDB, making it easier to work with complex data structures.

• Mongoose simplifies interactions with MongoDB by providing a schema-based solution

• It allows for defining data models with validation rules and relationships between data

• Mongoose also provides middleware functions for pre and post processing of data operations

Soft delete is a technique used to mark records as deleted without actually removing them from the database.

• Add a 'deleted_at' column to the database table to store the timestamp of when the record was soft deleted

• Update queries to set the 'deleted_at' timestamp when a record is soft deleted

• Modify queries to exclude soft deleted records by checking for 'deleted_at' column being null