{"id":25583919,"date":"2024-05-22T10:49:47","date_gmt":"2024-05-22T05:19:47","guid":{"rendered":"https:\/\/entri.app\/blog\/?p=25583919"},"modified":"2025-12-19T10:48:08","modified_gmt":"2025-12-19T05:18:08","slug":"full-stack-developer-interview-questions-for-freshers","status":"publish","type":"post","link":"https:\/\/entri.app\/blog\/full-stack-developer-interview-questions-for-freshers\/","title":{"rendered":"Full-Stack Developer Interview Questions for Freshers [2026]"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79_2 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-69e8a98643c91\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-69e8a98643c91\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/entri.app\/blog\/full-stack-developer-interview-questions-for-freshers\/#What_is_Full-stack_Web_Development\" >What is Full-stack Web Development<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/entri.app\/blog\/full-stack-developer-interview-questions-for-freshers\/#Why_Choose_Full-stack_Web_Development\" >Why Choose Full-stack Web Development<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/entri.app\/blog\/full-stack-developer-interview-questions-for-freshers\/#Full_Stack_Developer_Interview_Questions_for_Freshers\" >Full Stack Developer Interview Questions for Freshers<\/a><\/li><\/ul><\/nav><\/div>\n<p>How does the interview process for a position as a Full-Stack Developer work? Especially if this is your first time on the hot seat, it is normal to feel nervous at first. A Full Stack Development role is among the most sought-after and well-liked careers in the digital sector.<\/p>\n<p>Full-stack developers are professionals with a broad variety of skill sets and knowledge, in addition to specialising in front-end and back-end development. One of the most significant jobs in technology due to its high level of responsibility is software development, and firms are willing to pay much for people with the necessary skill set and variety of knowledge.<\/p>\n<p style=\"text-align: center;\"><strong><a href=\"https:\/\/entri.app\/course\/full-stack-developer-course\/\" target=\"_blank\" rel=\"noopener\">\u00a0Learn Full Stack Development with expert mentors! Get Free Demo Here!<\/a><\/strong><\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_is_Full-stack_Web_Development\"><\/span><strong>What is Full-stack Web Development<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The process of planning, building, testing, and launching an entire web application from beginning to end is known as full stack development. It entails using a variety of tools and technologies, such as database development, front-end web development, and back-end web development. Additionally, a software engineer or developer who works on both the front and back ends of a website or application is referred to as full stack developers. Working with the front-end and back-end technologies that drive a website or application is something that a full-stack developer is accustomed to.<\/p>\n<h3><strong>Who is a Full-stack Developer?<\/strong><\/h3>\n<p>A person with the ability to design both client and server software is known as a full-stack web developer. In other words, full-stack engineers are knowledgeable about every technology involved in creating a website. Front-end developers are responsible for creating and designing client-side (front-end) web architecture and server-side (back-end) applications. They also collaborate with graphic designers to create web design elements, develop RESTful services and APIs, test and debug software, make sure it is cross-platform compatible, and more.<\/p>\n<p style=\"text-align: center;\"><strong><a href=\"https:\/\/entri.app\/course\/full-stack-developer-course\/\" target=\"_blank\" rel=\"noopener\">\u00a0Learn Full Stack Development with expert mentors! Get Free Demo Here!<\/a><\/strong><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Why_Choose_Full-stack_Web_Development\"><\/span><span data-sheets-root=\"1\" data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;What is full stack web development\\r\\nWhy choose full stack web development\\r\\nFull Stack Developer Interview Questions for Freshers\\r\\n( List out the interview questions for freshers)\\r\\n\\r\\n&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:769,&quot;3&quot;:{&quot;1&quot;:0},&quot;11&quot;:4,&quot;12&quot;:0}\"><strong>Why Choose Full-stack Web Development<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Since full-stack engineers frequently oversee the whole web application development process from beginning to end, they need to be extremely knowledgeable about all the tools and technologies used in web development. Since developing a website is usually a team effort, they must also collaborate well with others.<\/p>\n<p>A solid foundation in web development technologies, including HTML, CSS, and JavaScript, is possessed by the majority of full-stack engineers. Additionally, they have knowledge of server-side technologies like Node.js, Ruby on Rails, and PHP. Full-stack engineers are technically proficient, but they also have a profound understanding of how a website or application&#8217;s various components function as a whole.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Full_Stack_Developer_Interview_Questions_for_Freshers\"><\/span><span data-sheets-root=\"1\" data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;What is full stack web development\\r\\nWhy choose full stack web development\\r\\nFull Stack Developer Interview Questions for Freshers\\r\\n( List out the interview questions for freshers)\\r\\n\\r\\n&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:769,&quot;3&quot;:{&quot;1&quot;:0},&quot;11&quot;:4,&quot;12&quot;:0}\"><strong>Full Stack Developer Interview Questions for Freshers<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h5><strong>Q1. What is multithreading?<\/strong><\/h5>\n<article class=\"ibpage-article\"><strong>Answer: <\/strong>A thread is a stand-alone component or unit within an application or process that is currently running. &#8220;Multithreading&#8221; refers to the simultaneous execution of many threads in a process. Consider it an application&#8217;s method of multitasking.<\/article>\n<h5><strong>Q2. Explain CI (Continuous Integration)?<\/strong><\/h5>\n<article class=\"ibpage-article\"><strong>Answer: <\/strong>The practice of automating and merging code changes into a single software project\u2014often many times a day\u2014is known as continuous integration, or CI. Enabling developers to merge their code changes into a central repository where automated tests and builds can run is the goal of this DevOps technique. Prior to integration, automated tools are utilised to verify the accuracy of the new code. Fundamental to continuous integration is a source code version control system.<\/p>\n<h5><strong>Q3. What is event loop in Node.js?<\/strong><\/h5>\n<article class=\"ibpage-article\"><strong>Answer: <\/strong>Asynchronous programming in JavaScript is made possible by the event loop. While everything in JS happens on a single thread, we may provide the appearance of multi-threading by using clever data structures. Any async task is managed by a queue and listener when using the Event Loop.<\/article>\n<article class=\"ibpage-article\">\n<h5><strong>Q4. Differentiate between Node.Js and Django?<\/strong><\/h5>\n<p><strong>Answer:<\/strong><\/p>\n<table class=\"table table-bordered\">\n<tbody>\n<tr>\n<td><strong>Node.Js<\/strong><\/td>\n<td><strong>Django<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Web applications can be developed using an open-source framework called Node.Js, which is based on JavaScript.<\/td>\n<td>One kind of Python-based open-source framework for creating web applications is called Django.<\/td>\n<\/tr>\n<tr>\n<td>C, CPP, and JavaScript are the three programming languages used in the development of the Node.Js framework.<\/td>\n<td>The Python programming language is used in the development of the Django framework.<\/td>\n<\/tr>\n<tr>\n<td>Applications created with Node.Js are more scalable than those created with Django.<\/td>\n<td>Compared to apps created using Node.Js, those created with Django are less scalable.<\/td>\n<\/tr>\n<tr>\n<td>The idea of event-driven programming is used by Node.Js.<\/td>\n<td>When developing, Django adheres to the Model View Template architecture principle.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<section id=\"get-vs-post\" class=\"ibpage-article-header\">\n<h5><strong>Q5. Differentiate between GET and POST.<\/strong><\/h5>\n<article class=\"ibpage-article\"><strong>Answer: <\/strong>There are two distinct HTTP request methods: GET and POST.<\/p>\n<table>\n<thead>\n<tr>\n<th>GET<\/th>\n<th>POST<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Using an API URL, one can use this method to request data from a specific site.<\/td>\n<td>Using an API URL, this technique is used to write or transmit data to a designated resource for processing.<\/td>\n<\/tr>\n<tr>\n<td>A URL can have up to 2048 characters if you use the GET method to deliver data. The data is added to the URL. As a result, its data length is limited.<\/td>\n<td>It doesn&#8217;t put such restrictions in place.<\/td>\n<\/tr>\n<tr>\n<td>Since data is sent as part of the URL, GET is less secure than POST. Sensitive data, such as passwords, should never be provided over GET.<\/td>\n<td>Because the parameters are not saved in the web server logs or the browser history, using POST is a little safer than using GET.<\/td>\n<\/tr>\n<tr>\n<td>All users have access to the data via the URL.<\/td>\n<td>The URL displays no info at all.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/article>\n<\/section>\n<section id=\"explain-restful-api-write-its-usage\" class=\"ibpage-article-header\">\n<h5><strong>Q6. Define Restful API and its uses?<\/strong><\/h5>\n<article class=\"ibpage-article\"><strong>Answer: <\/strong>The standards and protocols known as APIs (Application Programming Interfaces) specify how devices or software applications may interact with one another. REST APIs are application programming interfaces that follow the representational state transfer (REST) design principles.Another name for REST APIs is RESTful APIs.\u00a0Developers can submit queries and get responses via an HTTP request by using RESTful APIs. Data mapping from a cloud platform to a data warehouse, or vice versa, is another application for REST API.<\/article>\n<\/section>\n<section id=\"mean-stack\" class=\"ibpage-article-header\">\n<h5><strong>Q7. What is MEAN Stack?<\/strong><\/h5>\n<article class=\"ibpage-article\"><strong>Answer: <\/strong>The acronym MEAN stands for Node.js, AngularJS, ExpressJS, and MongoDB. It is a group of technologies for creating web apps that are based on JavaScript. Even though it&#8217;s a jumble of disparate technologies, they&#8217;re all built around JavaScript. Because of its great user-friendliness, this stack is perfect for developing dynamic websites and applications. You may create web-based prototypes quickly and simply using this open-source, free stack.<\/article>\n<article>\n<p style=\"text-align: center;\"><strong><a href=\"https:\/\/entri.app\/course\/full-stack-developer-course\/\" target=\"_blank\" rel=\"noopener\">\u00a0Learn Full Stack Development with expert mentors! Get Free Demo Here!<\/a><\/strong><\/p>\n<\/article>\n<\/section>\n<section id=\"how-to-prevent-a-bot-from-scraping-your-publicly-accessible-api\" class=\"ibpage-article-header\">\n<h5><strong>Q8. Are you aware of how to stop a bot from grabbing data from your openly accessible API?<\/strong><\/h5>\n<article class=\"ibpage-article\"><strong>Answer: <\/strong>Technically, data scraping cannot be totally stopped as long as the data in the API is available to the general public. Nevertheless, slowing or occasional limitation can help reduce bot activity\u2014automated computer programmes that run on the internet and carry out certain tasks. A certain device won&#8217;t be able to submit an infinite number of requests in a predetermined amount of time because to rare limiting. An HTTP error 429 Too Many Attempts is raised if more requests are made than what is allowed. Since the IP address is not unique to each device and potentially prevent the entire network from accessing the API, it is imperative to store more information about the device than just its IP address.<\/p>\n<h5><strong>Q9. Which programming language do full-stack developers prefer?<\/strong><\/h5>\n<p><strong>Answer: <\/strong>Programming languages are used by Full Stack Developers in many languages. A candidate should ideally be multilingual, with some languages being useful for front-end design and others for back-end maintenance. Full Stack developers need to be fluent in two or three of the most widely used languages, including Java, Python, Ruby, PHP, C++, and others, because they work with a wide range of technologies and applications.<\/p>\n<\/article>\n<\/section>\n<\/article>\n<\/article>\n<section id=\"explain-pair-programming\" class=\"ibpage-article-header\">\n<h5><strong>Q10. What is Pair Programming?<\/strong><\/h5>\n<article class=\"ibpage-article\"><strong>Answer: <\/strong>When two programmers work together in pair programming, they only share one computer. Throughout the development process, one programmer will take on the role of the driver and write the code, while another will take on the role of the observer or navigator and ensure that the code is written correctly, proofread, and spell-checked, as well as choose the next step.It is possible to switch roles at any moment: the spectator might become the driver, and vice versa. It can alternatively be referred to as &#8220;paired programming,&#8221; &#8220;pairing,&#8221; or &#8220;programming in pairs.&#8221;<\/p>\n<h5><strong>Q11. Define CORS (Cross-Origin Resource Sharing)?<\/strong><\/h5>\n<article class=\"ibpage-article\"><strong>Answer: <\/strong>Cross-origin resource sharing is referred to as CORS. Cross-domain requests are a browser feature that permits web pages in one domain to have restricted access to resources in other domains. This makes it possible for scripts running on a browser client to communicate with and access resources coming from other sources.<\/article>\n<article><\/article>\n<article class=\"ibpage-article\">A website&#8217;s access to resources outside of its source domain is restricted by same-origin regulations. For instance, the SOP will prevent a JavaScript application from attempting to use an API (Application Programming Interface) that is hosted on a different domain. A CORS policy was put in place to get around limitations brought on by same-origin regulations.<\/article>\n<article><\/article>\n<article class=\"ibpage-article\">\n<h5><strong>Q12. Explain Callback Hell?<\/strong><\/h5>\n<article class=\"ibpage-article\"><strong>Answer: <\/strong>A prevalent anti-pattern in asynchronous programming code (several functions running simultaneously) is called Callback Hell or Pyramid of Doom. This colloquial phrase refers to several nested &#8220;if&#8221; statements or functions. To put it simply, callback hell occurs when you have many asynchronous methods. Because those functions are interdependent, having so many callback functions stacked in so many layers might grow really confusing.<\/p>\n<h5><strong>Q13. What is the difference between GraphQL and REST?<\/strong><\/h5>\n<p><strong>Answer:<\/strong><\/p>\n<article class=\"ibpage-article\">\n<table>\n<thead>\n<tr>\n<th>GraphQL<\/th>\n<th>REST<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>It is an API query language that allows clients to choose which data to receive from the API using declarative data fetching.<\/td>\n<td>It is an architectural style for API architecture that establishes a set of guidelines for building online services.<\/td>\n<\/tr>\n<tr>\n<td>GraphQL has a reputation for being quite predictable. This allows you to send queries to your API and receive precise responses, eliminating the need to supply unnecessary information.<\/td>\n<td>On the other hand, the HTTP and URI techniques that are utilised determine how REST behaves. As a result, API users might not know what to anticipate when contacting an endpoint.<\/td>\n<\/tr>\n<tr>\n<td>GraphQL can guarantee API security, although its security features aren&#8217;t as developed as REST&#8217;s. For example, GraphQL helps with data validation integration, but users are responsible for implementing authorization and authentication mechanisms.<\/td>\n<td>REST can be used to enforce API security in a number of ways. To guarantee REST API security, you can use a variety of authentication techniques, like HTTP authentication.<\/td>\n<\/tr>\n<tr>\n<td>You only need to make one API call to obtain everything you require when using GraphQL. There is no need to over- or under-fetch because you can define the structure of the information you require, and the server will return the same structure to you.<\/td>\n<td>As such, you can receive undesirable data or have to make several queries before receiving the correct data because REST APIs have strict data structures that only ever supply the requested data when they are accessed. These flaws can thereby cause the server&#8217;s response time (to return information) to increase.<\/td>\n<\/tr>\n<tr>\n<td>Only the JSON format is supported.<\/td>\n<td>There is support for XML, YAML, JSON, HTML, and more formats.<\/td>\n<\/tr>\n<tr>\n<td>Multiple microservices and mobile applications are GraphQL&#8217;s primary use cases.<\/td>\n<td>Resource-driven and basic apps are the primary uses for rest.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h5><strong>Q14. What is MEAN stack and MERN stack?<\/strong><\/h5>\n<p><strong>Answer:<\/strong><\/p>\n<p><strong>MEAN stack:<\/strong> Angular, Node.js, Express.js, and MongoDB comprise the MEAN stack.<\/p>\n<p><strong>MERN stack:<\/strong> MongoDB, Express.js, React.js, and Node.js comprise the MERN stack.<\/p>\n<ul>\n<li>MEVN: Node.js, Express.js, Vue.js, and MongoDB. Full-stack applications may be developed successfully and efficiently with MEVN. It is a MERN and MEAN on-the-go substitute.<\/li>\n<li>PHP, MySQL, Apache, and Linux make up LAMP. It is among the most widely used stacks for developing cloud-based applications.<\/li>\n<li>PERN is Express.Js, React.Js, Node.Js, and PostgreSQL. Applications based on CRUD operations are developed using PERN.<\/li>\n<\/ul>\n<h5><strong>Q15. Define scope in Angular Js?<\/strong><\/h5>\n<p><strong>Answer: <\/strong>The term &#8220;scope&#8221; in Angular.js describes the binding portion that sits between the JavaScript controller and the HTML view. It also includes the objects and data for the application. The scope in Angular.Js comes in two varieties:<\/p>\n<ul>\n<li><strong>$scope \u2013<\/strong> A JavaScript object called $scope is used to facilitate communication between the controller and the view. In essence, $scope links a view (DOM element) to the controller&#8217;s methods and ViewModel.<\/li>\n<li><strong>$rootScope \u2013<\/strong> The highest scope in Angular is $rootScope.$rootScope is Js. An application can only have one $rootScope, which is shared by every component. It functions similarly to a global variable as a result. The $rootScope is the parent of all other $scopes.<\/li>\n<\/ul>\n<h5><strong>Q16. Explain the term \u201cReplication\u201d in MongoDB?<\/strong><\/h5>\n<p><strong>Answer: <\/strong>In MongoDB, replication is the process of synchronising data across several servers. Replication provides redundancy and increases data availability by creating several copies of the data on different database servers. A database is protected by replication from the loss of a single server. Replication can also help users recover from service outages and device malfunctions. One copy of the data can be designated by users for backup, reporting, or disaster recovery.<\/p>\n<h5><strong>Q17. Is there a way to decrease the load time of a web application?<\/strong><\/h5>\n<p><strong>Answer:<\/strong><\/p>\n<article class=\"ibpage-article\">Here are some ways to reduce load times for web applications:<\/p>\n<ul>\n<li><strong>Image Optimization:\u00a0<\/strong>The file size of an image can be dramatically reduced by switching to a different file format. For example, GIFs work well for images with few colors, such as logos, JPEG is ideal for images with lots of colors and details, such as photographs, and PNG format is ideal for transparent images with high quality.<\/li>\n<li><strong>Keep JavaScript and CSS in external files:<\/strong>\u00a0Embedding JavaScript and CSS in HTML documents forces them to be downloaded every time the HTML document is loaded. In this case, browser caching is not utilized, and the HTML document becomes larger. This is why you should always place CSS and JavaScript in external files; it is a best practice and simplifies maintenance.<\/li>\n<li><strong>Reducing redirects:\u00a0<\/strong>Too many redirects will delay the loading time of a website. HTTP requests and responses are delayed each time a page redirects. Getting rid of unnecessary redirects on your site will reduce the load time of your site significantly.<\/li>\n<li><strong>Load CSS and JavaScript files asynchronously:\u00a0<\/strong>Your website contains CSS and JavaScript files that can be loaded either synchronously or asynchronously. As part of synchronous loading, each file is loaded sequentially, in the order it appears on your site. As opposed to synchronous loading, asynchronous loading allows multiple files to be loaded simultaneously, boosting the performance of a website.<\/li>\n<li><strong>Minify HTML, CSS, and JavaScript:\u00a0<\/strong>If you optimize the way your files load, your pages will load more quickly. You can do the same when it comes to HTML, CSS, and JavaScript code. By eliminating unnecessary spaces, characters, and comments, you can reduce the size of your files. This will make your web pages load faster.<\/li>\n<\/ul>\n<table>\n<tbody>\n<tr>\n<td colspan=\"3\"><strong>Full Stack Developer courses in cities<\/strong><\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/entri.app\/course\/full-stack-developer-course-in-kochi\/\">Full stack developer course in kochi<\/a><\/td>\n<td><a href=\"https:\/\/entri.app\/course\/full-stack-developer-course-in-calicut\/\">\u00a0Full Stack developer course in calicut<\/a><\/td>\n<td>\u00a0<a href=\"https:\/\/entri.app\/course\/full-stack-developer-course-in-trivandrum\/\">Full Stack Developer\u00a0Course in\u00a0trivandrum<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong style=\"color: #212121; font-size: 1.1em;\">Q18. State difference between blue\/green deployment and rolling deployment.<\/strong><\/p>\n<\/article>\n<article class=\"ibpage-article\"><strong>Answer: <\/strong>Today, the software is rapidly created and features are often changed based on customer needs, and then it is deployed into production. Each organization has its unique way of getting new applications into the production environment. Most organizations follow the standard deployment and release strategies such as Blue-Green and Rolling Deployment.<\/article>\n<ul>\n<li><strong>Blue-Green Deployment Strategy:<\/strong><\/li>\n<\/ul>\n<p>A deployment strategy like this creates two separate infrastructure environments i.e., blue and green. A blue environment contains older code (old version), while a green environment (production) contains the latest code (new version). There is only one live production environment at any given time.<\/p>\n<p><i>Example:\u00a0<\/i>For instance, the green environment is live and is receiving all user traffic, while the clone (blue) is idle. Once a new version of an application is ready for release, it can be deployed to the blue environment for testing. As soon as the new release passes testing, application traffic is switched from green to blue. Blue then becomes the live production environment, and Green becomes idle, ready for testing the next release.<\/p>\n<ul>\n<li><strong>Rolling Deployment Strategy<\/strong><\/li>\n<\/ul>\n<p>Using this deployment strategy, old versions of an application are completely replaced with the new versions by completely replacing the infrastructure on which they run.<\/p>\n<p><i>Example:<\/i>\u00a0When a new version must be deployed to all nodes, the new version is deployed to the first node while all other nodes handle end-user traffic. As soon as the new version is successfully installed on the first node, it will begin managing end-user traffic while the new version is being installed on the second node. The process is repeated until all nodes have been successfully upgraded to the new version.<\/p>\n<section id=\"what-is-a-connection-leak-how-can-you-fix-it-in-java\" class=\"ibpage-article-header\">\n<h5><strong>Q19. In Java, what is a connection leak? How can you fix this?<\/strong><\/h5>\n<article class=\"ibpage-article\"><strong>Answer: <\/strong>If a connection is opened and forgotten about, this is known as a &#8220;leak&#8221; since each time it occurs, a connection is no longer available for reuse. Connection leaks occur when some database requests or transactions are not closed properly or are not committed, causing the connections to be abandoned and closed permanently.Java developers commonly experience Connection Leaks when using Connection Pools. In the case where there is a section of code that fails to close a connection properly, a connection will leak from the pool each time the section of code is executed. Eventually, if this situation continues, the pool will run out of connections, which is known as Pool Exhaustion. The application will hang once all available connections have been leaked. We can fix this by closing the connection and paying particular attention to any error handling code.<\/article>\n<\/section>\n<section id=\"what-is-promise-and-explain-its-states\" class=\"ibpage-article-header\">\n<h5><strong>Q20. What is Promise and explain its states?<\/strong><\/h5>\n<article class=\"ibpage-article\"><strong>Answer:<\/strong> Callback functions are functions that can be passed to another function as arguments and executed there to complete a routine or action. Those functions depend on one another, so it could get quite messy with so many callback functions nested in so many layers. This is what is referred to as callback hell.As an alternative to callbacks in JavaScript, promises are used to handle asynchronous operations. In addition to handling multiple asynchronous operations, they provide better error handling than callbacks. Promises can be a better way for a user to read the code effectively and efficiently, especially when that particular code performs multiple asynchronous operations. The Promise object represents the result of an asynchronous operation (or its failure) and the resulting value. The promise is in one of the following states:<\/p>\n<ul>\n<li><strong>Pending:<\/strong>\u00a0In its initial state, neither fulfilled nor rejected.<\/li>\n<li><strong>Fulfilled:<\/strong>\u00a0Indicating that the operation was successful.<\/li>\n<li><strong>Rejected:<\/strong>\u00a0Indicating that the operation failed<\/li>\n<\/ul>\n<p style=\"text-align: center;\"><strong><a href=\"https:\/\/entri.app\/course\/full-stack-developer-course\/\" target=\"_blank\" rel=\"noopener\">\u00a0Learn Full Stack Development with expert mentors! Get Free Demo Here!<\/a><\/strong><\/p>\n<\/article>\n<\/section>\n<\/article>\n<\/article>\n<\/article>\n<\/article>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>How does the interview process for a position as a Full-Stack Developer work? Especially if this is your first time on the hot seat, it is normal to feel nervous at first. A Full Stack Development role is among the most sought-after and well-liked careers in the digital sector. Full-stack developers are professionals with a [&hellip;]<\/p>\n","protected":false},"author":100,"featured_media":25634001,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[802,1926],"tags":[],"class_list":["post-25583919","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles","category-full-stack-web-development"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Full stack Developer Interview Questions for Freshers (updated )<\/title>\n<meta name=\"description\" content=\"Kickstart your career with guide to Full-Stack Developer interview questions for freshers. 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