{"id":767,"date":"2026-10-27T17:47:10","date_gmt":"2026-10-27T12:17:10","guid":{"rendered":"https:\/\/www.itvedant.com\/blog\/?p=767"},"modified":"2026-10-26T18:01:44","modified_gmt":"2026-10-26T12:31:44","slug":"connect-react-to-spring-boot-backend","status":"publish","type":"post","link":"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/","title":{"rendered":"How to Connect a React Frontend to a Spring Boot Backend: Beginner&#8217;s Guide"},"content":{"rendered":"\n<p>A full stack application has two major parts: the frontend that users interact with and the backend that processes requests, manages business logic and communicates with databases.<\/p>\n\n\n\n<p>React is commonly used to build interactive frontend interfaces, while Spring Boot helps Java developers create backend applications and REST APIs.<\/p>\n\n\n\n<p>But how do these technologies work together?<\/p>\n\n\n\n<p>In this tutorial, you will build a simple React application that fetches data from a Spring Boot REST API and displays it on the screen.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_68_1 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><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><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#Understanding_React_and_Spring_Boot_Integration\" title=\"Understanding React and Spring Boot Integration\">Understanding React and Spring Boot Integration<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#What_You_Need_Before_Starting\" title=\"What You Need Before Starting\">What You Need Before Starting<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#Step_1_Create_a_Spring_Boot_Project\" title=\"Step 1: Create a Spring Boot Project\">Step 1: Create a Spring Boot Project<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#Step_2_Create_a_REST_Controller\" title=\"Step 2: Create a REST Controller\">Step 2: Create a REST Controller<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#Step_3_Run_the_Spring_Boot_Backend\" title=\"Step 3: Run the Spring Boot Backend\">Step 3: Run the Spring Boot Backend<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#Step_4_Create_the_React_Application\" title=\"Step 4: Create the React Application\">Step 4: Create the React Application<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#Step_5_Fetch_Backend_Data_in_React\" title=\"Step 5: Fetch Backend Data in React\">Step 5: Fetch Backend Data in React<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#Step_6_Test_the_Full_Stack_Application\" title=\"Step 6: Test the Full Stack Application\">Step 6: Test the Full Stack Application<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#Common_Errors_and_Their_Solutions\" title=\"Common Errors and Their Solutions\">Common Errors and Their Solutions<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#CORS_Error\" title=\"CORS Error\">CORS Error<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#Failed_to_Fetch\" title=\"Failed to Fetch\">Failed to Fetch<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#Incorrect_JSON_Structure\" title=\"Incorrect JSON Structure\">Incorrect JSON Structure<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#Backend_Port_Conflict\" title=\"Backend Port Conflict\">Backend Port Conflict<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#How_to_Turn_This_into_a_Portfolio_Project\" title=\"How to Turn This into a Portfolio Project\">How to Turn This into a Portfolio Project<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#Frequently_Asked_Questions\" title=\"Frequently Asked Questions\">Frequently Asked Questions<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#1_Can_React_work_with_a_Java_backend\" title=\"1. Can React work with a Java backend?\">1. Can React work with a Java backend?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#2_Is_Spring_Boot_a_frontend_or_backend_technology\" title=\"2. Is Spring Boot a frontend or backend technology?\">2. Is Spring Boot a frontend or backend technology?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#3_Do_I_need_MySQL_to_connect_React_with_Spring_Boot\" title=\"3. Do I need MySQL to connect React with Spring Boot?\">3. Do I need MySQL to connect React with Spring Boot?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#4_Why_do_I_get_a_CORS_error\" title=\"4. Why do I get a CORS error?\">4. Why do I get a CORS error?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#5_Is_React_with_Spring_Boot_suitable_for_a_fresher_project\" title=\"5. Is React with Spring Boot suitable for a fresher project?\">5. Is React with Spring Boot suitable for a fresher project?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.itvedant.com\/blog\/connect-react-to-spring-boot-backend\/#Conclusion\" title=\"Conclusion\">Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Understanding_React_and_Spring_Boot_Integration\"><\/span><strong>Understanding React and Spring Boot Integration<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>React and Spring Boot can communicate through HTTP requests.<\/p>\n\n\n\n<p>The process works like this:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>A user opens the React application.<\/li>\n\n\n\n<li>React sends a request to the Spring Boot backend.<\/li>\n\n\n\n<li>Spring Boot processes the request.<\/li>\n\n\n\n<li>The backend returns JSON data.<\/li>\n\n\n\n<li>React displays the result.<\/li>\n<\/ol>\n\n\n\n<p>For example, an online learning platform might use React to display available courses while Spring Boot retrieves course information from a database.<\/p>\n\n\n\n<p>Our sample project will demonstrate the same basic workflow using a small, fixed dataset.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_You_Need_Before_Starting\"><\/span><strong>What You Need Before Starting<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Install or prepare:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Java JDK compatible with your chosen Spring Boot version<\/li>\n\n\n\n<li>Node.js and npm<\/li>\n\n\n\n<li>A Java IDE such as IntelliJ IDEA or VS Code<\/li>\n\n\n\n<li>A code editor for React<\/li>\n\n\n\n<li>Basic knowledge of JavaScript and Java<\/li>\n<\/ul>\n\n\n\n<p>You should also understand the difference between GET and POST requests.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_1_Create_a_Spring_Boot_Project\"><\/span><strong>Step 1: Create a Spring Boot Project<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Open <strong>Spring Web<\/strong>.<\/p>\n\n\n\n<p>Configure a new project with Java, Maven and a compatible Spring Boot version.<\/p>\n\n\n\n<p>Add the <strong>Spring Web<\/strong> dependency.<\/p>\n\n\n\n<p>Generate the project, extract it and open it in your Java IDE.<\/p>\n\n\n\n<p>Spring Boot will handle the HTTP endpoint that React calls.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_2_Create_a_REST_Controller\"><\/span><strong>Step 2: Create a REST Controller<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Inside the Java application&#8217;s package, create a file named CourseController.java.<\/p>\n\n\n\n<p>Add the following code, replacing the package name with your own if necessary:<\/p>\n\n\n\n<p>package com.example.demo;<\/p>\n\n\n\n<p>import java.util.List;<\/p>\n\n\n\n<p>import java.util.Map;<\/p>\n\n\n\n<p>import org.springframework.web.bind.annotation.*;<\/p>\n\n\n\n<p>@RestController<\/p>\n\n\n\n<p>@RequestMapping(&#8220;\/api\/courses&#8221;)<\/p>\n\n\n\n<p>@CrossOrigin(origins = &#8220;http:\/\/localhost:5173&#8221;)<\/p>\n\n\n\n<p>public class CourseController {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;@GetMapping<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;public List&lt;Map&lt;String, String&gt;&gt; getCourses() {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return List.of(<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Map.of(&#8220;id&#8221;, &#8220;1&#8221;, &#8220;name&#8221;, &#8220;Java&#8221;),<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Map.of(&#8220;id&#8221;, &#8220;2&#8221;, &#8220;name&#8221;, &#8220;React&#8221;),<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Map.of(&#8220;id&#8221;, &#8220;3&#8221;, &#8220;name&#8221;, &#8220;SQL&#8221;)<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;);<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;}<\/p>\n\n\n\n<p>}<\/p>\n\n\n\n<p>The @RestController annotation tells Spring Boot that this class handles HTTP requests.<\/p>\n\n\n\n<p>@GetMapping creates a GET endpoint, while @CrossOrigin allows requests from the local React development server.<\/p>\n\n\n\n<p>This CORS setting is intended for development. Production origins should be explicitly configured based on the deployed application&#8217;s requirements.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_3_Run_the_Spring_Boot_Backend\"><\/span><strong>Step 3: Run the Spring Boot Backend<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Start the application from your IDE or with the Maven wrapper provided by the generated project.<\/p>\n\n\n\n<p>Once it starts successfully, open:<\/p>\n\n\n\n<p>http:\/\/localhost:8080\/api\/courses<\/p>\n\n\n\n<p>You should receive JSON similar to:<\/p>\n\n\n\n<p>[<\/p>\n\n\n\n<p>&nbsp;&nbsp;{&#8220;id&#8221;:&#8221;1&#8243;,&#8221;name&#8221;:&#8221;Java&#8221;},<\/p>\n\n\n\n<p>&nbsp;&nbsp;{&#8220;id&#8221;:&#8221;2&#8243;,&#8221;name&#8221;:&#8221;React&#8221;},<\/p>\n\n\n\n<p>&nbsp;&nbsp;{&#8220;id&#8221;:&#8221;3&#8243;,&#8221;name&#8221;:&#8221;SQL&#8221;}<\/p>\n\n\n\n<p>]<\/p>\n\n\n\n<p>This response confirms that the endpoint is available.<\/p>\n\n\n\n<p>If the request fails, check the application logs, port configuration and Java version.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_4_Create_the_React_Application\"><\/span><strong>Step 4: Create the React Application<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Open a terminal and run:<\/p>\n\n\n\n<p>npm create vite@latest course-frontend &#8212; &#8211;template react<\/p>\n\n\n\n<p>cd course-frontend<\/p>\n\n\n\n<p>npm install<\/p>\n\n\n\n<p>npm run dev<\/p>\n\n\n\n<p>Vite creates a React development project.<\/p>\n\n\n\n<p>Its default development server typically runs at http:\/\/localhost:5173, although it may select another port if that address is unavailable.<\/p>\n\n\n\n<p>If the port changes, update the allowed origin in Spring Boot.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_5_Fetch_Backend_Data_in_React\"><\/span><strong>Step 5: Fetch Backend Data in React<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Open src\/App.jsx and replace the starter component with:<\/p>\n\n\n\n<p>import { useEffect, useState } from &#8220;react&#8221;;<\/p>\n\n\n\n<p>function App() {<\/p>\n\n\n\n<p>&nbsp;&nbsp;const [courses, setCourses] = useState([]);<\/p>\n\n\n\n<p>&nbsp;&nbsp;const [error, setError] = useState(&#8220;&#8221;);<\/p>\n\n\n\n<p>&nbsp;&nbsp;useEffect(() =&gt; {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;fetch(&#8220;http:\/\/localhost:8080\/api\/courses&#8221;)<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;.then((response) =&gt; {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (!response.ok) {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;throw new Error(&#8220;Could not load courses&#8221;);<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return response.json();<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;})<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;.then((data) =&gt; setCourses(data))<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;.catch((err) =&gt; setError(err.message));<\/p>\n\n\n\n<p>&nbsp;&nbsp;}, []);<\/p>\n\n\n\n<p>&nbsp;&nbsp;return (<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&lt;main&gt;<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;h1&gt;Available Courses&lt;\/h1&gt;<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{error &amp;&amp; &lt;p role=&#8221;alert&#8221;&gt;{error}&lt;\/p&gt;}<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;ul&gt;<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{courses.map((course) =&gt; (<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;li key={course.id}&gt;{course.name}&lt;\/li&gt;<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;))}<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;\/ul&gt;<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&lt;\/main&gt;<\/p>\n\n\n\n<p>&nbsp;&nbsp;);<\/p>\n\n\n\n<p>}<\/p>\n\n\n\n<p>export default App;<\/p>\n\n\n\n<p>The useEffect hook triggers the API request after the component renders.<\/p>\n\n\n\n<p>The fetch() function sends an HTTP GET request to the Spring Boot backend.<\/p>\n\n\n\n<p>The response is converted into JavaScript data and saved in React state using setCourses().<\/p>\n\n\n\n<p>Whenever the state changes, React updates the user interface.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_6_Test_the_Full_Stack_Application\"><\/span><strong>Step 6: Test the Full Stack Application<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Keep both servers running and open the React application in your browser.<\/p>\n\n\n\n<p>The page should display:<\/p>\n\n\n\n<p><strong>Available Courses<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Java<\/li>\n\n\n\n<li>React<\/li>\n\n\n\n<li>SQL<\/li>\n<\/ul>\n\n\n\n<p>Open the browser&#8217;s developer tools and navigate to the Network tab.<\/p>\n\n\n\n<p>Refresh the page and inspect the request to \/api\/courses.<\/p>\n\n\n\n<p>Check the request URL, response status and returned JSON.<\/p>\n\n\n\n<p>This is useful when troubleshooting integration issues.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Errors_and_Their_Solutions\"><\/span><strong>Common Errors and Their Solutions<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"CORS_Error\"><\/span><strong>CORS Error<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>If React and Spring Boot run on different origins, the browser enforces CORS rules.<\/p>\n\n\n\n<p>Ensure the backend permits the correct frontend origin.<\/p>\n\n\n\n<p>Avoid enabling unrestricted origins without understanding the security implications.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Failed_to_Fetch\"><\/span><strong>Failed to Fetch<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Check whether the Spring Boot server is running and whether the endpoint URL is correct.<\/p>\n\n\n\n<p>Also check the browser&#8217;s Network and Console panels.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Incorrect_JSON_Structure\"><\/span><strong>Incorrect JSON Structure<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>React must use property names that match the API response.<\/p>\n\n\n\n<p>For example, if the backend returns name, your component should access course.name, not course.title.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Backend_Port_Conflict\"><\/span><strong>Backend Port Conflict<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>If another application is using port 8080, configure Spring Boot to use a different port and update the React API URL.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Turn_This_into_a_Portfolio_Project\"><\/span><strong>How to Turn This into a Portfolio Project<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Once the basic application works, you can improve it by adding:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A MySQL database<\/li>\n\n\n\n<li>Course search functionality<\/li>\n\n\n\n<li>CRUD operations<\/li>\n\n\n\n<li>Form validation<\/li>\n\n\n\n<li>Authentication and authorization<\/li>\n\n\n\n<li>Automated tests<\/li>\n\n\n\n<li>Deployment to a hosting platform<\/li>\n<\/ul>\n\n\n\n<p>Document the architecture and explain how the frontend communicates with the backend.<\/p>\n\n\n\n<p>A complete, tested project demonstrates considerably more than knowing the definitions of React or Spring Boot.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span><strong>Frequently Asked Questions<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Can_React_work_with_a_Java_backend\"><\/span><strong>1. Can React work with a Java backend?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Yes. React can communicate with a Java backend through HTTP APIs, including REST APIs created using Spring Boot.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Is_Spring_Boot_a_frontend_or_backend_technology\"><\/span><strong>2. Is Spring Boot a frontend or backend technology?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Spring Boot is primarily used to build backend applications and services in Java.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Do_I_need_MySQL_to_connect_React_with_Spring_Boot\"><\/span><strong>3. Do I need MySQL to connect React with Spring Boot?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>No. You can begin with fixed or in-memory data. A database becomes useful when the application needs persistent storage.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Why_do_I_get_a_CORS_error\"><\/span><strong>4. Why do I get a CORS error?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>A CORS error can occur when the browser sends a cross-origin request that the backend has not permitted.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Is_React_with_Spring_Boot_suitable_for_a_fresher_project\"><\/span><strong>5. Is React with Spring Boot suitable for a fresher project?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Yes. It can demonstrate API integration, frontend development, backend programming and application architecture.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><strong>Conclusion<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Connecting React with Spring Boot is an important full stack development skill. It helps developers understand how user interfaces exchange data with backend services.<\/p>\n\n\n\n<p>Start with a simple GET API, understand the complete request-response cycle and gradually introduce a database, authentication, testing and deployment.<\/p>\n\n\n\n<p>To explore these technologies through guided projects, visit Itvedant&#8217;s Java <a href=\"https:\/\/www.itvedant.com\/full-stack-developer-course\" title=\"\">Full Stack Development Course<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A full stack application has two major parts: the frontend that users interact with and the backend that processes requests, 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