{"id":1092,"date":"2020-09-27T16:50:54","date_gmt":"2020-09-27T16:50:54","guid":{"rendered":"https:\/\/www.datatype.co.in\/blog\/?p=1092"},"modified":"2020-10-11T17:23:24","modified_gmt":"2020-10-11T17:23:24","slug":"getting-started-with-deno","status":"publish","type":"post","link":"https:\/\/datatype.co.in\/blog\/getting-started-with-deno\/","title":{"rendered":"Getting Started With Deno"},"content":{"rendered":"\n
In this article, I am going to show you how to install Deno and write a simple Deno program and execute it, from scratch. We will be developing basic deno http server which will listen to a predefined port and respond. Let’s get started.<\/p>\n\n\n\n
Installing Deno on Windows:<\/h4>\n\n\n\n
Open Windows Power Shell and run the following command –<\/p>\n\n\n\n
This will install Deno in your machine, you will see the following output in the power shell window-<\/p>\n\n\n\n
PS C:\\Users> iwr https:\/\/deno.land\/x\/install\/install.ps1 -useb | iex\nDeno was installed successfully to C:\\Users\\Lok\\.deno\\bin\\deno.exe\nRun 'deno --help' to get started<\/code><\/pre>\n\n\n\n
Now check the installed Deno version by running deno --version<\/strong><\/code> command. If it is installed correctly, it will output the version as shown below-<\/p>\n\n\n\n
Now, let’s try running a sample Deno program. Run the following command on Windows Power Shell.<\/p>\n\n\n\n
PS C:\\Users> deno run https:\/\/deno.land\/std\/examples\/welcome.ts<\/code><\/pre>\n\n\n\n
It will output Welcome to Deno<\/strong> as shown below-<\/p>\n\n\n\n
PS C:\\Users> deno run https:\/\/deno.land\/std\/examples\/welcome.ts\n\u2190[0m\u2190[32mDownload\u2190[0m https:\/\/deno.land\/std\/examples\/welcome.ts\n\u2190[0m\u2190[33mWarning\u2190[0m Implicitly using latest version (0.71.0) for https:\/\/deno.land\/std\/examples\/welcome.ts\n\u2190[0m\u2190[32mDownload\u2190[0m https:\/\/deno.land\/std@0.71.0\/examples\/welcome.ts\n\u2190[0m\u2190[32mCheck\u2190[0m https:\/\/deno.land\/std@0.71.0\/examples\/welcome.ts\nWelcome to Deno \ud83e\udd95<\/code><\/pre>\n\n\n\n
Creating Simple Deno Server:<\/h4>\n\n\n\n
Now, let us create a simple Deno server app. Create a directory deno-app, add a new file say, server.ts <\/strong>and write the following code.<\/p>\n\n\n\n
\/\/server.ts\nimport { serve } from \"https:\/\/deno.land\/std@0.71.0\/http\/server.ts\";\nconst s = serve({ port: 8000 });\nconsole.log(\"http:\/\/localhost:8000\/\");\nfor await (const req of s) {\n req.respond({ body: \"Hello world, this is my first Deno app! \" });\n}<\/code><\/pre>\n\n\n\n
Execute the code by running deno run --allow-net server.ts<\/code><\/strong> command-<\/p>\n\n\n\n
PS E:\\Deno\\deno-app> deno run --allow-net server.ts\n\u2190[0m\u2190[32mCheck\u2190[0m file:\/\/\/E:\/Deno\/deno-app\/server.ts\nhttp:\/\/localhost:8000\/<\/code><\/pre>\n\n\n\n<\/figure>\n\n\n\n
That’s all. Now, our Deno server is up and it is listening to port 8000. You can open a browser and browse the URL http:\/\/localhost:8000\/<\/code><\/strong>, you will see the following output- <\/p>\n\n\n\n<\/figure>\n\n\n\n
Great! We have successfully developed a basic http server using Deno. As you see, whatever you type after localhost:8000<\/strong>, it will always return same Hello world<\/strong> message, because we have not written any code to handle different requests. In the upcoming article, I will show you how to handle different requests and respond back with data.<\/p>\n\n\n\n
List of Permission flag<\/h4>\n\n\n\n
As deno is secure by default it doesn\u2019t have any permission enable. These flags will be useful while for permission while running a file.<\/p>\n\n\n\n
\u2014 allow-write:<\/strong><\/code>Allow file system write access.<\/li>
\u2014 allow-all:<\/strong><\/code>: <\/strong>Give all access.<\/li><\/ul>\n\n\n\n
Hope this helps. Thanks for reading.<\/p>\n","protected":false},"excerpt":{"rendered":"
In this article, I am going to show you how to install Deno and write a simple Deno program and execute it, from scratch. We will be developing basic deno [ … ]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[250],"tags":[256,259,261,260],"class_list":["post-1092","post","type-post","status-publish","format-standard","hentry","category-deno","tag-deno-example","tag-deno-getting-started","tag-deno-sample-code","tag-install-deno-in-windows","list-style-post"],"_links":{"self":[{"href":"https:\/\/datatype.co.in\/blog\/wp-json\/wp\/v2\/posts\/1092","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/datatype.co.in\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/datatype.co.in\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/datatype.co.in\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/datatype.co.in\/blog\/wp-json\/wp\/v2\/comments?post=1092"}],"version-history":[{"count":23,"href":"https:\/\/datatype.co.in\/blog\/wp-json\/wp\/v2\/posts\/1092\/revisions"}],"predecessor-version":[{"id":1128,"href":"https:\/\/datatype.co.in\/blog\/wp-json\/wp\/v2\/posts\/1092\/revisions\/1128"}],"wp:attachment":[{"href":"https:\/\/datatype.co.in\/blog\/wp-json\/wp\/v2\/media?parent=1092"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/datatype.co.in\/blog\/wp-json\/wp\/v2\/categories?post=1092"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/datatype.co.in\/blog\/wp-json\/wp\/v2\/tags?post=1092"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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