{"id":135290,"date":"2024-09-05T16:01:15","date_gmt":"2024-09-05T10:31:15","guid":{"rendered":"https:\/\/www.vskills.in\/certification\/tutorial\/?page_id=135290"},"modified":"2024-09-05T16:01:16","modified_gmt":"2024-09-05T10:31:16","slug":"building-your-first-fastapi-app","status":"publish","type":"page","link":"https:\/\/www.vskills.in\/certification\/tutorial\/building-your-first-fastapi-app\/","title":{"rendered":"Building Your First FastAPI App"},"content":{"rendered":"\n<p>FastAPI is a modern, high-performance Python web framework built on top of the Pydantic data validation library. It&#8217;s designed to be fast, easy to use, and efficient. In this guide, we&#8217;ll walk you through the process of creating your first FastAPI application. By the end, you&#8217;ll have a solid understanding of the framework&#8217;s core concepts and be able to build your own web APIs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Prerequisites<\/strong><\/h3>\n\n\n\n<p>Before we dive into the code, make sure you have the following:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Python 3.7 or later<\/strong> installed on your system.<\/li>\n\n\n\n<li><strong>FastAPI<\/strong> installed using pip: <code class=\"\">pip install fastapi<\/code><\/li>\n\n\n\n<li><strong>uvicorn<\/strong> installed for running the application: <code class=\"\">pip install uvicorn<\/code><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Creating a Basic FastAPI Application<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. Import Necessary Modules:<\/strong><\/h3>\n\n\n\n<p>Python<\/p>\n\n\n\n<p><code>from fastapi import FastAPI<\/code><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. Create a FastAPI Instance:<\/strong><\/h3>\n\n\n\n<p>Python<\/p>\n\n\n\n<p><code>app = FastAPI()<\/code><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. Define a Path Operation:<\/strong><\/h3>\n\n\n\n<p>Python<\/p>\n\n\n\n<p><code>@app.get(\"\/\") def read_root(): return {\"Hello\": \"World\"}<\/code><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. Run the Application:<\/strong><\/h3>\n\n\n\n<p>Python<\/p>\n\n\n\n<p><code>if __name__ == \"__main__\": import uvicorn uvicorn.run(app, host=\"0.0.0.0\", port=8000)<\/code> <\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Explanation:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <code class=\"\">FastAPI<\/code> instance is created, which forms the core of your application.<\/li>\n\n\n\n<li>The <code class=\"\">@app.get(\"\/\")<\/code> decorator defines a path operation. This means that when a GET request is made to the root path (http:\/\/127.0.0.1:8000), the <code class=\"\">read_root<\/code> function will be executed.<\/li>\n\n\n\n<li>The <code class=\"\">read_root<\/code> function returns a dictionary containing the message &#8220;Hello&#8221;: &#8220;World&#8221;.<\/li>\n\n\n\n<li>Finally, the <code class=\"\">uvicorn.run()<\/code> function is used to start the FastAPI application on the specified host and port.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Testing the Application<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Open a terminal or command prompt.<\/li>\n\n\n\n<li>Navigate to the directory where your Python file is located.<\/li>\n\n\n\n<li>Run the following command: <code class=\"\">uvicorn main:app --reload<\/code> (replace <code class=\"\">main<\/code> with the name of your Python file)<\/li>\n\n\n\n<li>Open a web browser and go to http:\/\/127.0.0.1:8000. You should see the message &#8220;Hello: World&#8221; displayed.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>FastAPI is a modern, high-performance Python web framework built on top of the Pydantic data validation library. It&#8217;s designed to be fast, easy to use, and efficient. In this guide, we&#8217;ll walk you through the process of creating your first FastAPI application. By the end, you&#8217;ll have a solid understanding of the framework&#8217;s core concepts&#8230;<\/p>\n","protected":false},"author":16,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-135290","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Building Your First FastAPI App - Tutorial<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.vskills.in\/certification\/tutorial\/building-your-first-fastapi-app\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Building Your First FastAPI App - Tutorial\" \/>\n<meta property=\"og:description\" content=\"FastAPI is a modern, high-performance Python web framework built on top of the Pydantic data validation library. 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