diff --git a/src/app/app_logic/request/send.rs b/src/app/app_logic/request/send.rs
index ab9d151..70a295c 100644
--- a/src/app/app_logic/request/send.rs
+++ b/src/app/app_logic/request/send.rs
@@ -11,6 +11,7 @@ use reqwest::redirect::Policy;
 use tokio::task;
 
 use crate::app::app::App;
+use crate::panic_error;
 use crate::request::auth::Auth::{BasicAuth, BearerToken, NoAuth};
 use crate::request::body::{ContentType, find_file_format_in_content_type};
 
@@ -51,7 +52,10 @@ impl App<'_> {
                         match &proxy.http_proxy {
                             None => {}
                             Some(http_proxy_str) => {
-                                let proxy = Proxy::http(http_proxy_str).expect("Could not parse HTTP proxy");
+                                let proxy = match Proxy::http(http_proxy_str) {
+                                    Ok(proxy) => proxy,
+                                    Err(e) => panic_error(format!("Could not parse HTTP proxy\n\t{e}"))
+                                };
                                 client_builder = client_builder.proxy(proxy);
                             }
                         }
@@ -59,7 +63,10 @@ impl App<'_> {
                         match &proxy.https_proxy {
                             None => {}
                             Some(https_proxy_str) => {
-                                let proxy = Proxy::https(https_proxy_str).expect("Could not parse HTTPS proxy");
+                                let proxy = match Proxy::https(https_proxy_str) {
+                                    Ok(proxy) => proxy,
+                                    Err(e) => panic_error(format!("Could not parse HTTPS proxy\n\t{e}"))
+                                };
                                 client_builder = client_builder.proxy(proxy);
                             }
                         }
diff --git a/src/app/files/collection.rs b/src/app/files/collection.rs
index 6b60040..a0a95b9 100644
--- a/src/app/files/collection.rs
+++ b/src/app/files/collection.rs
@@ -2,8 +2,10 @@ use std::fs;
 use std::fs::OpenOptions;
 use std::io::{Read, Write};
 use std::path::PathBuf;
+
 use crate::app::app::App;
 use crate::app::startup::args::ARGS;
+use crate::panic_error;
 use crate::request::collection::Collection;
 
 impl App<'_> {
@@ -20,32 +22,21 @@ impl App<'_> {
 
         collection_file.read_to_string(&mut file_content).expect("\tCould not read collection file");
 
+        let mut collection: Collection = match serde_json::from_str(&file_content) {
+            Ok(collection) => collection,
+            Err(e) => panic_error(format!("Could not parse collection\n\t{e}"))
+        };
 
-        if file_content.len() == 0 {
-            let collection = Collection {
-                name: path_buf.file_stem().unwrap().to_str().unwrap().to_string(),
-                requests: vec![],
-                path: path_buf,
-            };
-
-            let collection_json = serde_json::to_string_pretty(&collection).expect("Could not serialize collection");
-
-            collection_file.write_all(collection_json.as_bytes()).expect("Could not write to collection file")
-        }
-        else {
-            let mut collection: Collection = serde_json::from_str(&file_content).expect("\tCould not parse collection");
-
-            collection.path = path_buf;
+        collection.path = path_buf;
 
-            self.collections.push(collection);
-        }
+        self.collections.push(collection);
 
         println!("Collection file parsed!");
     }
 
     /// Save app collection in the collection file through a temporary file
     pub fn save_collection_to_file(&mut self, collection_index: usize) {
-        if ARGS.dry_run {
+        if !ARGS.should_save {
             return;
         }
 
@@ -72,7 +63,7 @@ impl App<'_> {
 
     /// Delete collection file
     pub fn delete_collection_file(&mut self, collection: Collection) {
-        if ARGS.dry_run {
+        if !ARGS.should_save {
             return;
         }
 
diff --git a/src/app/files/config.rs b/src/app/files/config.rs
index 91f69d9..5f7861b 100644
--- a/src/app/files/config.rs
+++ b/src/app/files/config.rs
@@ -1,8 +1,9 @@
 use std::fs::OpenOptions;
-use std::io::{Read, Write};
+use std::io::Read;
 use std::path::PathBuf;
 use serde::{Deserialize, Serialize};
 use crate::app::app::App;
+use crate::panic_error;
 
 #[derive(Default, Serialize, Deserialize)]
 pub struct Config {
@@ -26,21 +27,17 @@ impl App<'_> {
         let mut config_file = OpenOptions::new()
             .read(true)
             .write(true)
-            .create(true)
             .open(path_buf.clone())
             .expect("\tCould not open config file");
 
         config_file.read_to_string(&mut file_content).expect("\tCould not read config file");
 
-        if file_content.len() == 0 {
-            let config_toml = toml::to_string_pretty(&self.config).expect("\tCould not serialize config file");
-            config_file.write_all(config_toml.as_bytes()).expect("\tCould not write to config file");
-        }
-        else {
-            let config: Config = toml::from_str(&file_content).expect("\tCould not parse config file");
+        let config: Config = match toml::from_str(&file_content) {
+            Ok(config) => config,
+            Err(e) => panic_error(format!("Could not parse config file\n\t{e}"))
+        };
 
-            self.config = config
-        }
+        self.config = config;
 
         println!("Config file parsed!");
     }
diff --git a/src/app/files/environment.rs b/src/app/files/environment.rs
index f5abf60..fe5af5e 100644
--- a/src/app/files/environment.rs
+++ b/src/app/files/environment.rs
@@ -1,13 +1,17 @@
 use std::path::PathBuf;
 use envfile::EnvFile;
 use crate::app::app::App;
+use crate::panic_error;
 use crate::request::environment::Environment;
 
 impl App<'_> {
     /// Add the environment file to the app environments
     pub fn add_environment_from_file(&mut self, path_buf: PathBuf) {
         let file_name = path_buf.file_name().unwrap().to_str().unwrap().to_string().replace(".env.", "");
-        let env = EnvFile::new(path_buf).expect("\tCould not parse environment file");
+        let env = match EnvFile::new(path_buf) {
+            Ok(env) => env,
+            Err(e) => panic_error(format!("Could not parse environment file\n\t{e}"))
+        };
 
         let environment = Environment {
             name: file_name,
diff --git a/src/app/files/log.rs b/src/app/files/log.rs
index 427bd82..54bfd8e 100644
--- a/src/app/files/log.rs
+++ b/src/app/files/log.rs
@@ -3,15 +3,15 @@ use crate::app::app::App;
 
 impl App<'_> {
     pub fn write_to_log_file(&mut self, modifier: String, key: String, app_state: String) {
-        self.log_file
-            .as_ref()
-            .unwrap()
-            .write_fmt(format_args!(
-                "{:25}{:25}{:40}\n",
-                modifier,
-                key,
-                app_state,
-            ))
-            .expect("Could not write to log file");
+        if let Some(log_file) = &mut self.log_file {
+            log_file
+                .write_fmt(format_args!(
+                    "{:25}{:25}{:40}\n",
+                    modifier,
+                    key,
+                    app_state,
+                ))
+                .expect("Could not write to log file")
+        }
     }
 }
\ No newline at end of file
diff --git a/src/app/files/postman.rs b/src/app/files/postman.rs
index 8afdcdf..497223a 100644
--- a/src/app/files/postman.rs
+++ b/src/app/files/postman.rs
@@ -6,6 +6,7 @@ use parse_postman_collection::v2_1_0::{AuthType, Body, FormParameterSrcUnion, He
 
 use crate::app::app::App;
 use crate::app::startup::args::ARGS;
+use crate::panic_error;
 use crate::request::auth::Auth;
 use crate::request::body::ContentType;
 use crate::request::collection::Collection;
@@ -15,11 +16,16 @@ use crate::request::settings::RequestSettings;
 
 impl App<'_> {
     pub fn import_postman_collection(&mut self, path_buf: &PathBuf, max_depth: u16) {
-        let mut postman_collection = parse_postman_collection::from_path(path_buf).expect("\tCould not parse Postman collection");
+        println!("Parsing Postman collection");
+
+        let mut postman_collection = match parse_postman_collection::from_path(path_buf) {
+            Ok(postman_collection) => postman_collection,
+            Err(e) => panic_error(format!("Could not parse Postman collection\n\t{e}"))
+        };
 
         let collection_name = postman_collection.info.name.clone();
 
-        println!("Parsing Postman collection \"{}\"", collection_name);
+        println!("Collection name: {}", collection_name);
 
         for existing_collection in &self.collections {
             if existing_collection.name == collection_name {
@@ -191,7 +197,10 @@ fn parse_request(item: Items) -> Request {
             /* METHOD */
 
             if let Some(method) = &request_class.method {
-                request.method = Method::from_str(method).expect(&format!("Unknown method \"{method}\""));
+                request.method = match Method::from_str(method) {
+                    Ok(method) => method,
+                    Err(_) => panic_error(format!("Unknown method \"{method}\""))
+                };
             }
 
             /* AUTH */
diff --git a/src/app/startup/args.rs b/src/app/startup/args.rs
index 96f6c51..2c48e62 100644
--- a/src/app/startup/args.rs
+++ b/src/app/startup/args.rs
@@ -1,13 +1,15 @@
+use std::env;
 use std::path::PathBuf;
 use clap::{Parser, Subcommand};
 use lazy_static::lazy_static;
+use crate::{panic_error};
 
 #[derive(Parser, Debug)]
 #[command(version, about, long_about = None)]
 pub struct Args {
     /// Main application directory, containing JSON collections files, the atac.toml config file and the atac.log file
     #[arg(short, long)]
-    pub directory: PathBuf,
+    pub directory: Option<PathBuf>,
 
     #[command(subcommand)]
     pub command: Option<Command>,
@@ -17,13 +19,13 @@ pub struct Args {
     pub dry_run: bool,
 }
 
-#[derive(Debug, Subcommand)]
+#[derive(Debug, Subcommand, PartialEq)]
 pub enum Command {
     /// Used to import a collection file such as Postman
-    Import(ImportArgs)
+    Import(ImportArgs),
 }
 
-#[derive(Debug, clap::Args)]
+#[derive(Debug, clap::Args, PartialEq)]
 pub struct ImportArgs {
     /// A file to import, only Postman v2.1 JSON collection for now
     pub path: PathBuf,
@@ -33,6 +35,33 @@ pub struct ImportArgs {
     pub max_depth: Option<u16>,
 }
 
+pub struct ParsedArgs {
+    pub directory: PathBuf,
+    pub is_directory_from_env: bool,
+    pub command: Option<Command>,
+    pub should_save: bool
+}
+
 lazy_static! {
-    pub static ref ARGS: Args = Args::parse();
+    pub static ref ARGS: ParsedArgs = {
+        let args = Args::parse();
+
+        let (directory, is_directory_from_env) = match args.directory {
+            // If a directory was provided with a CLI argument
+            Some(arg_directory) => (arg_directory, false),
+            // If no directory was provided with the CLI
+            None => match env::var("ATAC_MAIN_DIR") {
+                // If the ATAC_MAIN_DIR environment variable exists
+                Ok(env_directory) => (PathBuf::from(env_directory), true),
+                Err(_) => panic_error("No directory provided, provide one either with `--directory <dir>` or via the environment variable `ATAC_MAIN_DIR`")
+            }
+        };
+
+        ParsedArgs {
+            directory,
+            is_directory_from_env,
+            command: args.command,
+            should_save: !args.dry_run
+        }
+    };
 }
\ No newline at end of file
diff --git a/src/app/startup/startup.rs b/src/app/startup/startup.rs
index 2436f75..661a893 100644
--- a/src/app/startup/startup.rs
+++ b/src/app/startup/startup.rs
@@ -1,13 +1,19 @@
-use std::fs;
 use std::fs::OpenOptions;
+
 use crate::app::app::App;
 use crate::app::startup::args::{ARGS, Command};
+use crate::panic_error;
 
 impl App<'_> {
     /// Method called before running the app
     pub fn startup(&mut self) -> &mut Self {
         self.parse_app_directory();
 
+        // Creates the log file only if the app is allowed to save files
+        if ARGS.should_save {
+            self.create_log_file();
+        }
+
         if let Some(command) = &ARGS.command {
             match command {
                 Command::Import(import_args) => {
@@ -19,13 +25,11 @@ impl App<'_> {
         self
     }
 
-    pub fn parse_app_directory(&mut self) {
-        // Create the app directory if it does not exist
-        fs::create_dir_all(&ARGS.directory).expect(&format!("Could not create directory \"{}\"", ARGS.directory.display()));
-        
-        let paths = ARGS.directory.read_dir().expect(&format!("Directory \"{}\" not found", ARGS.directory.display()));
-
-        let mut was_config_file_parsed = false;
+    fn parse_app_directory(&mut self) {
+        let paths = match ARGS.directory.read_dir() {
+            Ok(paths) => paths,
+            Err(e) => panic_error(format!("Directory \"{}\" not found\n\t{e}", ARGS.directory.display()))
+        };
 
         for path in paths {
             let path = path.unwrap().path();
@@ -36,7 +40,7 @@ impl App<'_> {
 
             let file_name = path.file_name().unwrap().to_str().unwrap();
 
-            println!("Parsing: {}", path.display());
+            println!("Checking: {}", path.display());
 
             if file_name.ends_with(".json") {
                 self.set_collections_from_file(path);
@@ -46,7 +50,6 @@ impl App<'_> {
             }
             else if file_name == "atac.toml" {
                 self.parse_config_file(path);
-                was_config_file_parsed = true;
             }
             else if file_name == "atac.log" {
                 println!("Nothing to parse here")
@@ -54,18 +57,16 @@ impl App<'_> {
 
             println!();
         }
+    }
 
-        self.log_file = Some(
-            OpenOptions::new()
-                .write(true)
-                .create(true)
-                .truncate(true)
-                .open(ARGS.directory.join("atac.log"))
-                .expect("Could not open log file")
-        );
-        
-        if !was_config_file_parsed {
-            self.parse_config_file(ARGS.directory.join("atac.toml"));
-        }
+    fn create_log_file(&mut self) {
+        let path = ARGS.directory.join("atac.log");
+
+        let log_file = match OpenOptions::new().write(true).create(true).truncate(true).open(path) {
+            Ok(log_file) => log_file,
+            Err(e) => panic_error(format!("Could not open log file\n\t{e}"))
+        };
+
+        self.log_file = Some(log_file);
     }
 }
diff --git a/src/main.rs b/src/main.rs
index afb1e6f..a7ecb11 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,19 +1,26 @@
-mod app;
-mod request;
-mod utils;
+extern crate core;
 
-use std::io::{stdout, Result};
-use crossterm::{ExecutableCommand};
+use std::fmt::Display;
+use std::io::{Result, stdout};
+use std::process::exit;
+
+use crossterm::ExecutableCommand;
+use crossterm::style::Stylize;
 use crossterm::terminal::{disable_raw_mode, LeaveAlternateScreen};
-pub use ratatui::backend::{Backend};
+pub use ratatui::backend::Backend;
 use ratatui::backend::CrosstermBackend;
-use ratatui::{Terminal};
+use ratatui::Terminal;
+
 use crate::app::app::App;
 
+mod app;
+mod request;
+mod utils;
+
 #[tokio::main]
 async fn main() -> Result<()> {
     let terminal = Terminal::new(CrosstermBackend::new(stdout()))?;
-
+    
     App::new()
         .startup()
         .prepare_terminal()
@@ -24,3 +31,8 @@ async fn main() -> Result<()> {
     disable_raw_mode()?;
     Ok(())
 }
+
+pub fn panic_error<T>(message: T) -> ! where T: Display {
+    println!("{error}:\n\t{message}", error = "Error".red().bold());
+    exit(1);
+}
\ No newline at end of file