{"id":2448,"date":"2023-09-26T13:58:37","date_gmt":"2023-09-26T13:58:37","guid":{"rendered":"https:\/\/learning.workfall.com\/learning\/blog\/?p=2448"},"modified":"2025-09-12T07:23:31","modified_gmt":"2025-09-12T07:23:31","slug":"how-to-stream-json-data-using-server-sent-events-and-fastapi-in-python-over-http","status":"publish","type":"post","link":"https:\/\/learning.workfall.com\/learning\/blog\/how-to-stream-json-data-using-server-sent-events-and-fastapi-in-python-over-http\/","title":{"rendered":"How to Stream JSON Data Using Server-Sent Events and FastAPI in Python over HTTP?"},"content":{"rendered":"<span class=\"rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\">9<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Illustrations\/1.png\" alt=\"How to Stream JSON Data Using Server-Sent Events and FastAPI in Python over HTTP?\"\/><\/figure>\n\n\n\n<p>In this blog, we will cover:<\/p>\n\n\n\n<ul><li>What are Server-Sent Events?<ul><li>Why Stream Data Using Server-Sent Events (SSE)?<\/li><\/ul><\/li><li>What is FastAPI?<\/li><li>Hands-On<\/li><li>Conclusion<\/li><\/ul>\n\n\n\n<h2>What are Server-Sent Events?<\/h2>\n\n\n\n<p class=\"has-text-align-justify\">Server-Sent Events (SSE) is a simple and efficient technology for sending real-time updates from the server to the web browser over a single HTTP connection. <\/p>\n\n\n\n<p class=\"has-text-align-justify\">Unlike other real-time communication methods that involve complex setups or polling, SSE relies on a unidirectional flow of data, where the server pushes events as text-based messages to the client. These events can carry information like notifications, updates, or alerts. SSE is standardized in HTML5 and is widely supported by modern browsers. <\/p>\n\n\n\n<p class=\"has-text-align-justify\">It&#8217;s particularly useful for scenarios where the client needs timely updates from the server without resorting to frequent requests, enhancing web applications&#8217; responsiveness and efficiency.<\/p>\n\n\n\n<h3>Server-Sent Events (SSE) Architecture<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Illustrations\/3.png\" alt=\"How to Stream JSON Data Using Server-Sent Events and FastAPI in Python over HTTP?\"\/><\/figure>\n\n\n\n<h3>Why Stream Data Using Server-Sent Events (SSE)?<\/h3>\n\n\n\n<p class=\"has-text-align-justify\">Streaming data using Server-Sent Events (SSE) addresses the need for efficient and real-time communication between web servers and clients.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">Traditional web communication relies on the client repeatedly polling the server for updates, which can lead to unnecessary network traffic, increased server load, and delays in receiving new information. <\/p>\n\n\n\n<p class=\"has-text-align-justify\">SSE offers a more elegant solution by establishing a persistent and single HTTP connection between the client and server.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">One significant advantage of SSE is its simplicity of implementation. Unlike other real-time technologies that might require more complex setups like WebSockets or third-party libraries, SSE is based on standard HTTP and can be easily integrated into existing web applications.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">This makes it accessible to a wider range of developers and projects.<\/p>\n\n\n\n<h2>What is FastAPI?<\/h2>\n\n\n\n<p>FastAPI is a modern, high-performance web framework for creating Python APIs using standard type hints. It has the following main features:<\/p>\n\n\n\n<ul><li><strong>Fast to run<\/strong>: Its performance is comparable to <a href=\"https:\/\/learning.workfall.com\/learning\/blog\/how-to-perform-encryption-and-decryption-of-messages-using-crypto-in-node-js\/\"><strong>NodeJS<\/strong><\/a> and <a href=\"https:\/\/learning.workfall.com\/learning\/blog\/how-to-use-go-modules-for-package-management\/\"><strong>Go<\/strong><\/a>, owing to Starlette and pydantic.<\/li><li><strong>Fast to code<\/strong>: It enables considerable speed increases in development.<\/li><li><strong>Reduced number of bugs<\/strong>: It lowers the probability of human-caused errors.<\/li><li><strong>Intuitive<\/strong>: It provides excellent editor assistance, with completion everywhere and reduced debugging time.<\/li><li><strong>Straightforward<\/strong>: It is intended to be simple to use and learn so that you may spend less time reading documentation.<\/li><li><strong>Short<\/strong>: It reduces code duplication.<\/li><li><strong>Robust<\/strong>: It delivers production-ready code with interactive documentation.<\/li><li><strong>Standards-based<\/strong>: It is based on the open API standards OpenAPI and JSON Schema.<\/li><\/ul>\n\n\n\n<p class=\"has-text-align-justify\">The framework is intended to improve your development experience by allowing you to write simple code to create production-ready APIs that follow best practices by default.<\/p>\n\n\n\n<h2>Hands-On<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Illustrations\/2.png\" alt=\"\"\/><\/figure>\n\n\n\n<h3>Required installations:<\/h3>\n\n\n\n<p>To perform the demo, you require the following installations:<\/p>\n\n\n\n<ul><li><strong>aiohttp: <\/strong>It is a Python library for asynchronous HTTP client\/server communication, built on top of asyncio.<\/li><li><strong>FastAPI: <\/strong>FastAPI is a modern, high-performance web framework for building APIs with Python.<\/li><li><strong>UVicorn: <\/strong>UVicorn is a fast ASGI server for running Python web applications, designed for high performance and compatibility with asynchronous code.<\/li><li><strong>requests:<\/strong>&nbsp; requests is a library used for making HTTP requests in Python with a user-friendly interface.<\/li><\/ul>\n\n\n\n<p class=\"has-text-align-justify\">In this hands-on, we&#8217;ll learn to use Server-Sent Events to smoothly stream JSON data using FastAPI. We&#8217;ll start by making a new project in PyCharm IDE and installing the required libraries. Our coding journey will kick off with setting up FastAPI in the project.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">Then, we&#8217;ll dive into the server-side code. Initially, we&#8217;ll cover basic text streaming and then progress to streaming JSON events.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">Switching gears to the client side, we&#8217;ll work on the logic there. Along the way, we&#8217;ll thoroughly test our API multiple times to ensure everything functions as expected. Our end goal is to have a fully functional solution that can stream JSON events in real-time.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">This technique is super handy when we need to make lots of API calls quickly, which can be costly for the app. <\/p>\n\n\n\n<p class=\"has-text-align-justify\">By harnessing the power of Server-Sent Events, we&#8217;ll find out how to smartly handle this situation, saving resources and improving efficiency.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">By the end, we&#8217;ll have a grasp of an effective method to keep data flowing smoothly in our applications without unnecessary overheads.<\/p>\n\n\n\n<p>Open PyCharm CE on your desktop and click on \u2018New Project\u2019.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/1.jpg\" alt=\"How to Stream JSON Data Using Server-Sent Events and FastAPI in Python over HTTP?\"\/><\/figure>\n\n\n\n<p>Name your project and choose the path to save your project and then click on \u2018create\u2019.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/2.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>Remove all the auto-generated code from the main.py file.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/3.jpg\" alt=\"How to Stream JSON Data Using Server-Sent Events and FastAPI in Python over HTTP?\"\/><\/figure>\n\n\n\n<p>Open the PyCharm terminal and run the command as shown in the image below to install the FastAPI framework.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/4.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>On successful installation, you will see the screen as shown in the image below.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/5.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>Run the command as shown in the image below to install the UVicorn server.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/6.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>On successful installation, you will see the screen as shown in the image below.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/7.jpg\" alt=\"How to Stream JSON Data Using Server-Sent Events and FastAPI in Python over HTTP?\"\/><\/figure>\n\n\n\n<p>Run the command as shown in the image below to install the aiohttp library.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/8.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>On successful installation, you will see the screen as shown in the image below.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/9.jpg\" alt=\"How to Stream JSON Data Using Server-Sent Events and FastAPI in Python over HTTP?\"\/><\/figure>\n\n\n\n<p>Let&#8217;s create a demonstration API route and perform testing with FastAPI.<\/p>\n\n\n\n<p>Import the FastAPI class as shown in the image provided.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/10.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>Instantiate the FastAPI application using the FastAPI class as shown in the provided image.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/11.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>Create a root route at &#8216;\/&#8217; that provides a placeholder message in response.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/12.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>The final code will look as shown in the image below.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/13.jpg\" alt=\"How to Stream JSON Data Using Server-Sent Events and FastAPI in Python over HTTP?\"\/><\/figure>\n\n\n\n<p>Initiate the server using the command demonstrated in the provided image.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/14.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>After running the command the server will get started and you will see a screen as shown in the image below.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/15.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>Click on the link shown in the terminal to see the message that we returned from our code.<\/p>\n\n\n\n<p>If everything goes well, you will be able to see a message on your browser as shown in the image below.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/16.jpg\" alt=\"How to Stream JSON Data Using Server-Sent Events and FastAPI in Python over HTTP?\"\/><\/figure>\n\n\n\n<p>Let&#8217;s begin by exploring the process of streaming plain text before we dive into streaming JSON data.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">FastAPI framework provides a built-in class called StreamingResponse, which allows us to retrieve data in segmented portions or chunks.<\/p>\n\n\n\n<p>Let\u2019s change our existing code to stream basic text message.<\/p>\n\n\n\n<p>Import the StreamingResponse library and asyncio library as shown in the image below.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/17.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p class=\"has-text-align-justify\">Create a simulated generator function that mimics the streaming process.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">This function will produce a sequence of plain text strings within a loop that iterates 10 times. Between each iteration, the program will pause for 1 second before proceeding to the next iteration.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/18.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>Let&#8217;s invoke our generator function and provide it as an argument to the constructor of StreamingResponse.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/19.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>Now, let\u2019s write the client-side logic of our application to seamlessly fetch the data as a stream from the server&nbsp;<\/p>\n\n\n\n<p>Create a new file and name it client.py.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/20.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>Install the requests library using the command shown in the image below.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/21.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>Import the requests library as well as the datetime library as shown in the image below.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/22.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>Store the url of our server in a variable as shown in the image below.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/23.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p class=\"has-text-align-justify\">This will transfer information in one go over an HTTP connection from the server to the client. We can easily retrieve the data using Python&#8217;s &#8220;requests&#8221; library, as shown in the image below.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/24.jpg\" alt=\"How to Stream JSON Data Using Server-Sent Events and FastAPI in Python over HTTP?\"\/><\/figure>\n\n\n\n<p class=\"has-text-align-justify\">We&#8217;re taking in 16 bytes of data at a time from the stream. Sometimes, cutting off the data partway doesn&#8217;t cause issues. <\/p>\n\n\n\n<p class=\"has-text-align-justify\">But usually, we&#8217;ll be getting organized data that we&#8217;ll want to put back together, and for those situations, we need to know where each piece of data starts and finishes.<\/p>\n\n\n\n<p>The final code will look like as shown in the image below<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/25.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>Run the code using the command shown in the image below.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/26.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>Once the program runs successfully, we will get our output as a nice stream of data.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/27.jpg\" alt=\"How to Stream JSON Data Using Server-Sent Events and FastAPI in Python over HTTP?\"\/><\/figure>\n\n\n\n<p>Next, Let\u2019s move to Streaming JSON Events.<\/p>\n\n\n\n<p>Our objective is to stream the JSON data something like this:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/28.jpg\" alt=\"How to Stream JSON Data Using Server-Sent Events and FastAPI in Python over HTTP?\"\/><\/figure>\n\n\n\n<p class=\"has-text-align-justify\">Ideally, the client should be able to read the stream like a collection. They can be confident that each time they iterate through it, they&#8217;ll have a complete JSON object. This makes it easy for the client to understand and work with.<\/p>\n\n\n\n<p>To make it possible, we need to adjust our server to stream JSON objects instead of plain text.<\/p>\n\n\n\n<p>Adjust the code in the main.py file as shown in the image below.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/29.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p class=\"has-text-align-justify\">Every event will be written as a JSON object in a row, and each event will be separated by a new line. We&#8217;re also using the media type &#8220;application\/x-ndjson,&#8221; which just means that each JSON object is on its own line. We looked into it, and it seems like this is the right type to use. This should make things easier for you.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">With these changes, the client can use the &#8220;readline()&#8221; function to easily read a stream of lines. This function will provide basic units of data in the form of raw bytes. <\/p>\n\n\n\n<p class=\"has-text-align-justify\">These bytes can then be converted into a readable JSON format. By adding a few more convenient features, we can achieve the user-friendly interface we wanted. Look at the example provided in the image below.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/30.jpg\" alt=\"How to Stream JSON Data Using Server-Sent Events and FastAPI in Python over HTTP?\"\/><\/figure>\n\n\n\n<p>Let\u2019s run the program using the command shown in the image below.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/31.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p>After running the command, we can observe a nice flow of JSON events being created as shown in the image below.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/32.jpg\" alt=\"How to Stream JSON Data Using Server-Sent Events and FastAPI in Python over HTTP?\"\/><\/figure>\n\n\n\n<p>This code can be written in a synchronous way as well. Refer to the below example.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"https:\/\/workfall-techblogs.s3.ap-southeast-1.amazonaws.com\/181\/Images\/33.jpg\" alt=\"How to Stream JSON Data Using Server-Sent Events and FastAPI in Python over HTTP?\"\/><\/figure>\n\n\n\n<h2>Conclusion<\/h2>\n\n\n\n<p class=\"has-text-align-justify\">In this hands-on project, we learned about using Server-Sent Events to smoothly stream JSON data using FastAPI. We started by making a new project using PyCharm IDE and putting in the necessary stuff we need. Then, we got FastAPI set up in our project. <\/p>\n\n\n\n<p class=\"has-text-align-justify\">After that, we did some coding on the server side. First, we practiced sending simple text, and later, we moved on to sending JSON events.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">On the other side of things, we worked on the part that gets the information from the server i.e., the client. While doing this, we made sure to test our work to make sure it was doing what we wanted. <\/p>\n\n\n\n<p class=\"has-text-align-justify\">Our big goal was to create something that could send JSON information in real-time. We successfully achieved this using both synchronous and asynchronous ways.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">This method becomes really useful when we need to do a lot of things quickly without spending too much. By using Server-Sent Events, we found a clever way to handle this and make things better. <\/p>\n\n\n\n<p class=\"has-text-align-justify\">At the end of it all, we figured out a great method to keep information moving smoothly in our apps without making things complicated.<\/p>\n\n\n\n<p>We will come up with more such use cases in our upcoming blogs.&nbsp;<\/p>\n\n\n\n<p><strong>Meanwhile\u2026<\/strong><\/p>\n\n\n\n<p>If you are an aspiring Python developer and want to explore more about the above topics, here are a few of our blogs for your reference:<\/p>\n\n\n\n<ul><li><a href=\"https:\/\/learning.workfall.com\/learning\/blog\/how-to-create-an-amazon-price-tracker-service-using-python\/\">How to Create an Amazon Price Tracker Service Using Python?<\/a><\/li><li><a href=\"https:\/\/learning.workfall.com\/learning\/blog\/how-to-read-and-write-in-google-spreadsheet-using-python-and-sheety-api\/\">How to Read and Write In Google Spreadsheet Using Python and Sheety API?<\/a><\/li><li><a href=\"https:\/\/learning.workfall.com\/learning\/blog\/how-to-execute-linux-commands-in-python\/\">How to Execute Linux Commands in Python?<\/a><\/li><\/ul>\n\n\n\n<p>Stay tuned to get all the updates about our upcoming blogs on the cloud and the latest technologies.<\/p>\n\n\n\n<p><strong>Keep Exploring -&gt; Keep Learning -&gt; Keep Mastering<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-justify\">At <a href=\"https:\/\/www.workfall.com\/\">Workfall<\/a>, we strive to provide the best tech and pay opportunities to kickass coders around the world. If you\u2019re looking to work with global clients, build cutting-edge products, and make big bucks doing so, give it a shot at <a href=\"https:\/\/www.workfall.com\/partner\/\">workfall.com\/partner<\/a> today!<\/p>\n\n\n<style type=\"text\/css\"><\/style><section id='' \n                class='helpie-faq accordions faq-toggle open-first groupSettings-478__enabled' \n                data-collection='' \n                data-pagination='0' \n                data-search='0' \n                data-pagination-enabled='0'\n                role='region'\n                aria-label='FAQ Section'\n                aria-live='polite'><h3 class=\"collection-title\">Frequently Asked Questions:<\/h3><article class=\"accordion \"><div class='helpie-faq-row'><div class='helpie-faq-col helpie-faq-col-12' ><ul><li class=\"accordion__item \"><div class=\"accordion__header \" \r\n                id=\"accordion-header-post-2635\"\r\n                role=\"button\"\r\n                aria-expanded=\"false\"\r\n                aria-controls=\"accordion-content-post-2635\"\r\n                data-id=\"post-2635\" \r\n                data-item=\"hfaq-post-2635\" \r\n                style=\"background:transparent;\" \r\n                data-tags=\"\"\r\n                tabindex=\"0\"><div class=\"accordion__title\">Q: Why should I use Server-Sent Events (SSE) instead of polling or WebSockets for streaming updates?<\/div><\/div><div id=\"accordion-content-post-2635\" \r\n                class=\"accordion__body\" \r\n                role=\"region\"\r\n                aria-labelledby=\"accordion-header-post-2635\"\r\n                style=\"background:transparent;\"><p><span class=\"rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\">9<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><span style=\"font-weight: 400\"><strong>A:<\/strong> SSE allows the server to push real-time updates over a single persistent HTTP connection. It&#8217;s simpler to implement than WebSockets and more efficient than frequent polling, making it ideal for use cases like live notifications or streaming JSON updates.<\/span><\/p>\n<\/div><\/li><li class=\"accordion__item \"><div class=\"accordion__header \" \r\n                id=\"accordion-header-post-2636\"\r\n                role=\"button\"\r\n                aria-expanded=\"false\"\r\n                aria-controls=\"accordion-content-post-2636\"\r\n                data-id=\"post-2636\" \r\n                data-item=\"hfaq-post-2636\" \r\n                style=\"background:transparent;\" \r\n                data-tags=\"\"\r\n                tabindex=\"0\"><div class=\"accordion__title\">Q: Can I stream full JSON objects and still ensure the client reads each one cleanly?<\/div><\/div><div id=\"accordion-content-post-2636\" \r\n                class=\"accordion__body\" \r\n                role=\"region\"\r\n                aria-labelledby=\"accordion-header-post-2636\"\r\n                style=\"background:transparent;\"><p><span class=\"rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\">9<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><span style=\"font-weight: 400\"><strong>A:<\/strong> Yes! In this approach, each JSON object is sent on its own line using the application\/x-ndjson media type, enabling clients to parse complete objects using readline() comfortably.<\/span><\/p>\n<\/div><\/li><li class=\"accordion__item \"><div class=\"accordion__header \" \r\n                id=\"accordion-header-post-2637\"\r\n                role=\"button\"\r\n                aria-expanded=\"false\"\r\n                aria-controls=\"accordion-content-post-2637\"\r\n                data-id=\"post-2637\" \r\n                data-item=\"hfaq-post-2637\" \r\n                style=\"background:transparent;\" \r\n                data-tags=\"\"\r\n                tabindex=\"0\"><div class=\"accordion__title\">Q: Which libraries should I install to get started with SSE and FastAPI?<\/div><\/div><div id=\"accordion-content-post-2637\" \r\n                class=\"accordion__body\" \r\n                role=\"region\"\r\n                aria-labelledby=\"accordion-header-post-2637\"\r\n                style=\"background:transparent;\"><p><span class=\"rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\">9<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><\/p>\n<ol>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\"><strong>A:<\/strong> You\u2019ll need FastAPI, Uvicorn (ASGI server), aiohttp for async HTTP work, and requests for testing the client-side streaming.<\/span><\/li>\n<\/ol>\n<\/div><\/li><li class=\"accordion__item \"><div class=\"accordion__header \" \r\n                id=\"accordion-header-post-2638\"\r\n                role=\"button\"\r\n                aria-expanded=\"false\"\r\n                aria-controls=\"accordion-content-post-2638\"\r\n                data-id=\"post-2638\" \r\n                data-item=\"hfaq-post-2638\" \r\n                style=\"background:transparent;\" \r\n                data-tags=\"\"\r\n                tabindex=\"0\"><div class=\"accordion__title\">Q: Is the streaming implementation synchronous or asynchronous\u2014and does it matter?<\/div><\/div><div id=\"accordion-content-post-2638\" \r\n                class=\"accordion__body\" \r\n                role=\"region\"\r\n                aria-labelledby=\"accordion-header-post-2638\"\r\n                style=\"background:transparent;\"><p><span class=\"rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\">9<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><span style=\"font-weight: 400\"><strong>A:<\/strong> The blog covers both approaches: an async generator using await for delays (e.g., 1-second intervals) and a synchronous version. FastAPI supports both, though async scales better.<\/span><\/p>\n<\/div><\/li><li class=\"accordion__item \"><div class=\"accordion__header \" \r\n                id=\"accordion-header-post-2639\"\r\n                role=\"button\"\r\n                aria-expanded=\"false\"\r\n                aria-controls=\"accordion-content-post-2639\"\r\n                data-id=\"post-2639\" \r\n                data-item=\"hfaq-post-2639\" \r\n                style=\"background:transparent;\" \r\n                data-tags=\"\"\r\n                tabindex=\"0\"><div class=\"accordion__title\">Q: What real-world benefits does this approach offer in API-heavy applications?<\/div><\/div><div id=\"accordion-content-post-2639\" \r\n                class=\"accordion__body\" \r\n                role=\"region\"\r\n                aria-labelledby=\"accordion-header-post-2639\"\r\n                style=\"background:transparent;\"><p><span class=\"rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\">9<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><span style=\"font-weight: 400\"><strong>A:<\/strong> Streaming with SSE can minimize redundant API calls, reduce network load, and deliver real-time responses\u2014super useful when you&#8217;re pushing frequent updates or handling many requests.<\/span><\/p>\n<\/div><\/li><\/ul><\/div><\/div><\/article><\/section>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\">9<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span> In this blog, we will cover: What are Server-Sent Events? Why Stream Data Using Server-Sent Events (SSE)? What is FastAPI? Hands-On Conclusion What are Server-Sent Events? Server-Sent Events (SSE) is a simple and efficient technology for sending real-time updates from the server to the web browser over a single HTTP connection. Unlike other real-time communication [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2449,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[288],"tags":[372,459,263,114,460,6],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Stream JSON Data Using Server-Sent Events and FastAPI in Python over HTTP? - The Workfall Blog<\/title>\n<meta name=\"description\" content=\"Learn how to stream JSON data with Server-Sent Events and FastAPI in Python, enhancing real-time communication over HTTP.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/learning.workfall.com\/learning\/blog\/how-to-stream-json-data-using-server-sent-events-and-fastapi-in-python-over-http\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Stream JSON Data Using Server-Sent Events and FastAPI in Python over HTTP? 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