diff --git a/src/main.rs b/src/main.rs
index 10ef728..1ce90db 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,41 +1,55 @@
-use reqwest::blocking::Client;
-use std::error::Error;
-use std::fs;
-use std::time::Duration;
-
 mod api;
 mod template;
 mod tools;
 
+use reqwest::blocking::Client;
+use std::{
+    error::Error,
+    fs,
+    time::Duration,
+    io::{
+        Error as IO_Error,
+        ErrorKind::{
+            Other,
+            ConnectionRefused
+        }
+    }
+};
 use api::make_url;
 use template::antares::Antares;
-use tools::{Logger, export_to_excel};
+use tools::{
+    Logger,
+    get_env,
+    export_to_excel
+};
 
-fn make_request(
-    url: &str,
-    logger: &Logger,
-) -> Result<String, Box<dyn Error>> {
+const URL_KEY: &str = "URL";
+const USERCODE_KEY: &str = "ANTARES_USERCODE";
+const PASSWORD_KEY: &str = "ANTARES_PASSWORD";
+const OUT_KEY: &str = "OUT";
+
+fn make_request(url: &str, logger: &Logger) -> Result<String, Box<dyn Error>> {
     let client = Client::builder()
         .timeout(Duration::from_secs(300))
         .build().map_err(|e| {
             logger.log_error(&format!("Failed to create HTTP client: {}", e));
-            Box::new(std::io::Error::new(std::io::ErrorKind::Other, e.to_string()))
+            Box::new(IO_Error::new(Other, e.to_string()))
         })?;
     
     let response = client.get(url).send().map_err(|e| {
         logger.log_error(&format!("HTTP request failed: {}", e));
-        Box::new(std::io::Error::new(std::io::ErrorKind::ConnectionRefused, e.to_string()))
+        Box::new(IO_Error::new(ConnectionRefused, e.to_string()))
     })?;
     
     if response.status().is_success() {
         Ok(response.text().map_err(|e| {
             logger.log_error(&format!("Failed to read response body: {}", e));
-            Box::new(std::io::Error::new(std::io::ErrorKind::Other, e.to_string()))
+            Box::new(IO_Error::new(Other, e.to_string()))
         })?)
     } else {
         let error_msg = format!("HTTP error: {:?}", response.status());
         logger.log_error(&error_msg);
-        Err(Box::new(std::io::Error::new(std::io::ErrorKind::ConnectionRefused, error_msg)))
+        Err(Box::new(IO_Error::new(ConnectionRefused, error_msg)))
     }
 }
 
@@ -45,31 +59,33 @@ fn main() -> Result<(), Box<dyn Error>> {
 
     dotenv::dotenv().ok();
 
-    let usercode = std::env::var("ANTARES_USERCODE")
+    let usercode = get_env(USERCODE_KEY)
         .map_err(|e| {
-            logger.log_error(&format!("Missing environment variable: ANTARES_USERCODE. {}", e));
-            Box::new(std::io::Error::new(std::io::ErrorKind::Other, "Missing ANTARES_USERCODE env var".to_string()))
-        })?;
-    let password = std::env::var("ANTARES_PASSWORD")
-        .map_err(|e| {
-            logger.log_error(&format!("Missing environment variable: ANTARES_PASSWORD. {}", e));
-            Box::new(std::io::Error::new(std::io::ErrorKind::Other, "Missing ANTARES_PASSWORD env var".to_string()))
-        })?;
-    let out_path = std::env::var("OUT")
-        .map_err(|e| {
-            logger.log_error(&format!("Missing environment variable: OUT. {}", e));
-            Box::new(std::io::Error::new(std::io::ErrorKind::Other, "Missing OUT env var".to_string()))
+            logger.log_error(&e);
+            e
         })?;
 
-    let base = std::env::var("URL")
+    let password = get_env(PASSWORD_KEY)
         .map_err(|e| {
-            logger.log_error(&format!("Missing environment variable: URL. {}", e));
-            Box::new(std::io::Error::new(std::io::ErrorKind::Other, "Missing URL env var".to_string()))
+            logger.log_error(&e);
+            e
+        })?;
+
+    let out_path = get_env(OUT_KEY)
+        .map_err(|e| {
+            logger.log_error(&e);
+            e
+        })?;
+
+    let url = get_env(URL_KEY)
+        .map_err(|e| {
+            logger.log_error(&e);
+            e
         })?;
 
     let cikkszam = ""; // supply a value if needed;
 
-    let url = make_url(&base, &usercode, &password, cikkszam);
+    let url = make_url(&url, &usercode, &password, cikkszam);
 
     let response = match make_request(&url, &logger) {
         Ok(resp) => {
@@ -86,7 +102,7 @@ fn main() -> Result<(), Box<dyn Error>> {
     let antares_file = format!("{}/antares.json", temp_dir);
     fs::create_dir_all(temp_dir).map_err(|e| {
         logger.log_error(&format!("Failed to create temp directory '{}': {}", temp_dir, e));
-        Box::new(std::io::Error::new(std::io::ErrorKind::Other, e.to_string()))
+        Box::new(IO_Error::new(Other, e.to_string()))
     })?;
 
     // Try to deserialize into strongly-typed `Antares` list.
@@ -102,7 +118,7 @@ fn main() -> Result<(), Box<dyn Error>> {
             };
             fs::write(&antares_file, &pretty).map_err(|e| {
                 logger.log_error(&format!("Failed to write {}: {}", antares_file, e));
-                Box::new(std::io::Error::new(std::io::ErrorKind::Other, e.to_string()))
+                Box::new(IO_Error::new(Other, e.to_string()))
             })?;
             logger.log(&format!("API call successful - Fetched {} items", items.len()));
             items
@@ -119,13 +135,13 @@ fn main() -> Result<(), Box<dyn Error>> {
                 };
                 fs::write(&antares_file, &pretty).map_err(|e| {
                     logger.log_error(&format!("Failed to write {}: {}", antares_file, e));
-                    Box::new(std::io::Error::new(std::io::ErrorKind::Other, e.to_string()))
+                    Box::new(IO_Error::new(Other, e.to_string()))
                 })?;
                 logger.log_info("Response saved as JSON (schema mismatch)");
             } else {
                 fs::write(&antares_file, &response).map_err(|e| {
                     logger.log_error(&format!("Failed to write {}: {}", antares_file, e));
-                    Box::new(std::io::Error::new(std::io::ErrorKind::Other, e.to_string()))
+                    Box::new(IO_Error::new(Other, e.to_string()))
                 })?;
                 logger.log_info("Response saved as raw text (not valid JSON)");
             }
diff --git a/src/tools/env.rs b/src/tools/env.rs
new file mode 100644
index 0000000..2d32def
--- /dev/null
+++ b/src/tools/env.rs
@@ -0,0 +1,13 @@
+// .env handling
+use std::env;
+
+pub fn get_env(key_name: &str) -> Result<String, String> {
+    match env::var(key_name) {
+        Ok(value) => Ok(value),
+        Err(e) => Err(format!(
+            "Failed to read environment variable key: {}, error: {}",
+            key_name,
+            e
+        ))
+    }
+}
\ No newline at end of file
diff --git a/src/tools/mod.rs b/src/tools/mod.rs
index 8f09027..0c01bbb 100644
--- a/src/tools/mod.rs
+++ b/src/tools/mod.rs
@@ -1,5 +1,7 @@
 pub mod excel;
 pub mod logger;
+pub mod env;
 
 pub use excel::export_to_excel;
 pub use logger::Logger;
+pub use env::get_env;
\ No newline at end of file