{"id":6099,"date":"2021-08-13T22:20:22","date_gmt":"2021-08-13T16:50:22","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=6099"},"modified":"2021-08-13T22:58:27","modified_gmt":"2021-08-13T17:28:27","slug":"load-env-fiie-golang","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/load-env-fiie-golang\/","title":{"rendered":"Load a .env or environment file in Go (Golang)"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_17 counter-hierarchy counter-decimal ez-toc-light-blue\">\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 class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><i class=\"ez-toc-glyphicon ez-toc-icon-toggle\"><\/i><\/a><\/span><\/div>\n<nav><ul class=\"ez-toc-list ez-toc-list-level-1\"><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/golangbyexamples.com\/load-env-fiie-golang\/#Overview\" title=\"Overview\">Overview<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/golangbyexamples.com\/load-env-fiie-golang\/#Program\" title=\"Program\">Program<\/a><\/li><\/ul><\/nav><\/div>\n<h1 class=\"has-luminous-vivid-orange-color has-text-color wp-block-heading\"><span class=\"ez-toc-section\" id=\"Overview\"><\/span><strong>Overview<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\"><strong>gotenv<\/strong> package in golang can be used to load <strong>.env <\/strong>or <strong>environment<\/strong> file in golang<br><a href=\"https:\/\/github.com\/joho\/godotenv\">https:\/\/github.com\/joho\/godotenv<\/a><\/p>\n\n\n\n<p class=\"has-medium-font-size\">Below is the signature of the function<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">func Load(filenames ...string) (err error) <\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">It takes a variable number of arguments where each argument can be the <strong>.env <\/strong>filenames that it needs to load<\/p>\n\n\n\n<h1 class=\"has-luminous-vivid-orange-color has-text-color wp-block-heading\"><span class=\"ez-toc-section\" id=\"Program\"><\/span><strong>Program<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\">Create a file <strong>local.env<\/strong> with below contents<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">STACK=DEV\nDATABASE=SQL<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Here is the program<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport (\n\t\"fmt\"\n\t\"log\"\n\t\"os\"\n\n\t\"github.com\/joho\/godotenv\"\n)\n\nfunc main() {\n\terr := godotenv.Load(\"local.env\")\n\tif err != nil {\n\t\tlog.Fatalf(\"Some error occured. Err: %s\", err)\n\t}\n\n\tval := os.Getenv(\"STACK\")\n\tfmt.Println(val)\n\n\tval = os.Getenv(\"DATABASE\")\n\tfmt.Println(val)\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Output<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">DEV\nSQL<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">It loads the <strong>local.env<\/strong> file and gives the correct output<\/p>\n\n\n\n<p class=\"has-medium-font-size\">It can also be used to load multiple .env files. Create a new file <strong>test.env<\/strong> with below contents<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">TEST=UNIT<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport (\n\t\"fmt\"\n\t\"log\"\n\t\"os\"\n\n\t\"github.com\/joho\/godotenv\"\n)\n\nfunc main() {\n\terr := godotenv.Load(\"local.env\", \"test.env\")\n\tif err != nil {\n\t\tlog.Fatalf(\"Some error occured. Err: %s\", err)\n\t}\n\n\tval := os.Getenv(\"STACK\")\n\tfmt.Println(val)\n\n\tval = os.Getenv(\"DATABASE\")\n\tfmt.Println(val)\n\n\tval = os.Getenv(\"TEST\")\n\tfmt.Println(val)\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Output<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">DEV\nSQL\nUNIT<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">If you don&#8217;t supply any argument to the <strong>Load<\/strong> function then by default it will load the file named <strong>.env<\/strong> in the current directory.<\/p>\n\n\n\n<p class=\"has-medium-font-size\">Create a file named .<strong>env <\/strong>with the below contents in the current directory<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">STACK=DEV\nDATABASE=SQL<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport (\n\t\"fmt\"\n\t\"log\"\n\t\"os\"\n\n\t\"github.com\/joho\/godotenv\"\n)\n\nfunc main() {\n\terr := godotenv.Load()\n\tif err != nil {\n\t\tlog.Fatalf(\"Some error occured. Err: %s\", err)\n\t}\n\n\tval := os.Getenv(\"STACK\")\n\tfmt.Println(val)\n\n\tval = os.Getenv(\"DATABASE\")\n\tfmt.Println(val)\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Notice in the above program that we didn&#8217;t pass any argument to the <strong>Load<\/strong> function<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Output<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">DEV\nSQL<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">This was about loading <strong>.env<\/strong> files in golang<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Note: <\/strong>Check out our Golang Advanced Tutorial. The tutorials in this series are elaborative and we have tried to cover all concepts with examples. This tutorial is for those who are looking to gain expertise and a solid understanding of golang &#8211; <a href=\"https:\/\/golangbyexamples.com\/golang-comprehensive-tutorial\/\">Golang Advance Tutorial<\/a><\/p>\n\n\n\n<p class=\"has-medium-font-size\">Also if you are interested in understanding how all design patterns can be implemented in Golang. If yes, then this post is for you &#8211;<a href=\"https:\/\/golangbyexamples.com\/all-design-patterns-golang\/\">All Design Patterns Golang<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Table of Contents OverviewProgram Overview gotenv package in golang can be used to load .env or environment file in golanghttps:\/\/github.com\/joho\/godotenv Below is the signature of the function It takes a variable number&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false},"categories":[1],"tags":[3,4],"class_list":["post-6099","post","type-post","status-publish","format-standard","hentry","category-tech","tag-go","tag-golang"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Load a .env or environment file in Go (Golang) - 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