Learn more about our current job openings and benefits of working at FSL.
Detailed reviews and feedback from past and current clients.
Get to know the Management Team behind FullStack Labs.
Our step-by-step process for designing and developing new applications.
Writings from our team on technology, design, and business.
Get answers to the questions most frequently asked by new clients.
Learn about our company culture and defining principles.
A high level overview of FullStack Labs, who we are, and what we do.
A JavaScript framework that allows rapid development of native Android and IOS apps.
A JavaScript framework maintained by Facebook that's ideal for building complex, modern user interfaces within single page web apps.
A server side programming language known for its ease of use and speed of development.
A lightweight and efficient backend javascript framework for web apps.
An interpreted high-level programming language great for general purpose programming.
A JavaScript framework maintained by Google that addresses many of the challenges encountered when building single-page apps.
A JavaScript framework that allows developers to build large, complex, scalable single-page web applications.
A progressive JavaScript framework known for its approachability, versatility, and performance.
A progressive JavaScript framework known for its approachability, versatility, and performance.
A progressive JavaScript framework known for its approachability, versatility, and performance.
A progressive JavaScript framework known for its approachability, versatility, and performance.
A progressive JavaScript framework known for its approachability, versatility, and performance.
A progressive JavaScript framework known for its approachability, versatility, and performance.
A progressive JavaScript framework known for its approachability, versatility, and performance.
View a sampling of our work implemented using a variety of our favorite technologies.
View examples of the process we use to build custom software solutions for our clients.
View projects implemented using this javascript framework ideal for building complex, modern user interfaces within single page web apps.
View projects implemented using this framework that allows rapid development of native Android and IOS apps.
View projects implemented using this backend javascript framework for web apps.
View projects implemented using this high-level programming language great for general purpose programming.
View projects implemented using this server side programming language known for its ease of use and speed of development.
We have vast experience crafting healthcare software development solutions, including UI/UX Design, Application Development, Legacy Healthcare Systems, and Team Augmentation. Our development services help the healthcare industry by enhancing accessibility, productivity, portability, and scalability.
We offer a range of custom software development solutions for education companies of all sizes. We're experts in Education Software Development and specialists in enhancing the learning experience across web, mobile, and conversational UI.
We're experts in developing Custom Software Solutions for the Logistics Industry. Our work offered a whole new and more efficient way for Logistics companies to manage their crucial operations.
We partner with various construction industry organizations to build custom software development solutions. Our Construction Software Development Services allow construction companies to manage projects, resources, and documentation.
We have vast experience crafting healthcare software development solutions, including UI/UX Design, Application Development, Legacy Healthcare Systems, and Team Augmentation. Our development services help the healthcare industry by enhancing accessibility, productivity, portability, and scalability.
We offer a range of custom software development solutions for education companies of all sizes. We're experts in Education Software Development and specialists in enhancing the learning experience across web, mobile, and conversational UI.
We're experts in developing Custom Software Solutions for the Logistics Industry. Our work offered a whole new and more efficient way for Logistics companies to manage their crucial operations.
We partner with various construction industry organizations to build custom software development solutions. Our Construction Software Development Services allow construction companies to manage projects, resources, and documentation.
Learn more about our current job openings and benefits of working at FSL.
Detailed reviews and feedback from past and current clients.
Get to know the Management Team behind FullStack Labs.
Our step-by-step process for designing and developing new applications.
Writings from our team on technology, design, and business.
Get answers to the questions most frequently asked by new clients.
Learn about our company culture and defining principles.
A high level overview of FullStack Labs, who we are, and what we do.
A JavaScript framework that allows rapid development of native Android and IOS apps.
A JavaScript framework maintained by Facebook that's ideal for building complex, modern user interfaces within single page web apps.
A server side programming language known for its ease of use and speed of development.
A lightweight and efficient backend javascript framework for web apps.
An interpreted high-level programming language great for general purpose programming.
A JavaScript framework maintained by Google that addresses many of the challenges encountered when building single-page apps.
A JavaScript framework that allows developers to build large, complex, scalable single-page web applications.
A progressive JavaScript framework known for its approachability, versatility, and performance.
A dynamic programming language used in all sorts of web and mobile applications.
A cross-platform programming language designed to run robust applications on any device.
A UI toolkit used to build natively compiled applications from a single codebase.
A functional programming language that’s ideal for scalability, maintainability, and reliability.
A Customer Relationship Management (CRM) platform that seamlessly integrates with your business operations.
A high-performance programming language that makes it easy to build simple, reliable, and efficient software.
View a sampling of our work implemented using a variety of our favorite technologies.
View examples of the process we use to build custom software solutions for our clients.
View projects implemented using this javascript framework ideal for building complex, modern user interfaces within single page web apps.
View projects implemented using this framework that allows rapid development of native Android and IOS apps.
View projects implemented using this backend javascript framework for web apps.
View projects implemented using this high-level programming language great for general purpose programming.
View projects implemented using this server side programming language known for its ease of use and speed of development.
FullStack Labs is a leading team of Node.js developers, engineers, programmers, coders, and architects. Uber, Siemens, and hundreds of other companies have chosen us for their mission critical software development projects.
We’ll review your code base and provide a report that includes quality scores for the following:
Paragon CET provides continuing education training to professionals in a variety of industries. We helped Paragon build an online training and test taking application that allows users to complete their continuing education requirements from the comfort of their own home. Users can review course material and training documents, complete tests with immediate results, manage payments, and receive a certificate of completion.
“They are spectacular in efficiently crafting the agile development plan.“
A minimalist framework built for performance, we prefer Express for most of our node.js apps.
Have a node app built with Koa, Meteor, Sails, or Feathers.js? We’re here to help. Our experienced team has worked with nearly all Node.js frameworks.
No framework, no problem. Our team of expert Node.js developers is well versed in scripting, provisioning, and working with custom code.
We will work with you to understand your technical needs, team dynamics, and goals.
We’ll send you FullStack Node developers that match your technical requirements, with links to their FullStack profile page which outlines their work experience and technical abilities, as well as their FullStack technical summary page, which includes a 60 minute video of the developer completing FullStack’s coding challenge, and a plethora of other technical information from their interview with us.
Start the engagement. Work with your new Node developers for a trial period, ensuring they're the right fit.
We design and build greenfield apps of all shapes and sizes using Node.js combined with a React.js, Ember.js, or Angular.js javascript framework.
Have a legacy Node.js app? We’re here to help. From debugging and maintenance to feature development and DevOps, we'll tailor a development plan to meet your needs.
Need to add a Node.js developer to your existing team? We'll seamlessly integrate as many Node.js developers as needed, to help you go faster and level up your team's skills.
We’d love to learn more about your project.
Engagements start at $75,000.
FullStack Labs is a leading team of Node.js developers, engineers, programmers, coders, and architects. Uber, Siemens, and hundreds of other companies have chosen us for their mission-critical software development projects. Node.js is a crucial tool to develop your project, here are a few Node.js Interview Questions you can use to screen your Node.js candidates:
Q: What is your favorite HTTP framework and why?
Answer:
There is no right answer for this. The goal here is to understand how deeply one knows the framework she/he uses. Tell what are the pros and cons of picking that framework.
Q: What is callback hell and how can it be avoided?
Answer:
Callback hell is when you have many deeply nested callback functions.
This is callback hell:
To avoid: modularization: break callbacks into independent functions
Q: What is the output of the following code snippet? explain what will happen line-by-line.
Answer:
Q: What are the ways to overcome single threaded nature of Node.JS?
Answer:
While NodeJS's main thread is a single thread there are a lot of things "under the hood" that are not single threaded and allow NodeJs to run operations in parallel.
child_process and cluster modules can be used to get around single threads but can be expensive in performance.
The worker_threads module can be used to execute JS in parallel and can share memory unlike child_process and cluster. worker_threads are experimental as of NodeJS v12.4.0
Q: List Pros and Cons of Node.JS clusters?
Answer:
Pros:
- Efficient use of processing power: As a cluster deploys on each core of a processor, you will basically have lighter node apps using each core of the CPU and not waste any power.
- Load balancing: Cluster libraries manage the load efficiently sending every second call to the next instance of the app on a different core of processor.
- Simple implementation: Cluster libraries are simple to use and setup. Very less to none extra coding is required, deployment/node scripts can be enough.
- Solution to single-threaded nature: As NodeJs started is single threaded in nature, you can not use all the CPU power if the app/process is only using one core of your multicore CPU. Cluster lets you use all cores.
Cons:
- Session based apps can not utilize a NodeJs cluster effectively as sessions will have to be set up on each instance.
- Using clusters on Cron jobs can be problematic if parallel processes target the same records at the same time.
Q: Why is Buffer considered a Super Data Type?
Answer:
- Buffer is NodeJS Datatype. It is a NodeJS addition to five primitives (boolean, string, number, undefined and null) and all-encompassing objects (arrays and functions are also objects) in front-end JavaScript.
- Buffer looks like an array of integers where each entity represents a byte of data. Overall, it represents a fixed-size chunk of memory (can't be resized after creation) allocated outside of the V8 JavaScript engine.
- Buffer can be created from an array, another buffer, ArrayBuffer or a string. It also supports encoding options as well such as UTF-8, ASCII, HEX and others.
- Think of buffers as extremely efficient data stores. In fact, Node.js tries to use buffers any time it can, such as when reading from a file system and when receiving packets over the network.
- In the age of streaming, it is a highly used datatype for packet data transfers.
Q: What is the difference between __dirname and process.cwd?
Answer:
i.e
main.js
-- CODE language-bash keep-markup --
console.log(process.cwd()) -> ./project
console.log(__dirname) -> ./project
moduleFile.js
-- CODE language-bash keep-markup --
console.log(process.cwd()) -> ./project
console.log(__dirname) -> ./project/Module
Q: What module should be used if we want to read a file?
Answer:
NodeJs has a built-in function called readFile, that function is into the module fs
Q: What is the role of REPL in node.js?
Answer:
It is used to execute ad-hoc Javascript statements. The REPL shell allows entry to javascript directly into a shell prompt and evaluates the results. For the purpose of testing, debugging, or experimenting, REPL is very critical
Q: Is node.js a single or multi thread process?
Answer:
In essence, it is a single thread process, it does not expose child threads and thread management methods to the developer. Technically, Node.js does spawn child threads for certain tasks such as asynchronous I/O, but these run behind the scenes and do not execute any application JavaScript code, nor block the main event loop.
Q: What command instructs the node package manager to install a package named my-package and register it as a development dependency?
Answer:
-- CODE language-bash keep-markup --
npm install my-package --save-dev
Q: Consider the following middleware function signature:
Answer:
-- CODE language-javascript keep-markup --
function myMiddleware(x, y, z)
What is the purpose of the third argument, z?
Answer:
The third argument will be the next middleware function in the application’s request-response cycle. This argument is more commonly named next.