diff --git a/src/crawl.rs b/src/crawl.rs
new file mode 100644
index 0000000..54615e2
--- /dev/null
+++ b/src/crawl.rs
@@ -0,0 +1,80 @@
+use anyhow::Error;
+use futures::try_join;
+use crate::federated_instances::GetSiteResponse;
+use crate::node_info::NodeInfo;
+use reqwest::Client;
+use serde::Serialize;
+use std::collections::VecDeque;
+use crate::REQUEST_TIMEOUT;
+
+pub async fn crawl(start_instances: Vec<String>) -> Result<Vec<InstanceDetails>, Error> {
+  let mut pending_instances = VecDeque::from(start_instances);
+  let mut instance_details = vec![];
+  while let Some(current_instance) = pending_instances.pop_back() {
+    match fetch_instance_details(&current_instance).await {
+      Ok(details) => {
+        instance_details.push(details.to_owned());
+        // add all unknown, linked instances to pending
+        let crawled_instances: &Vec<&str> =
+          &instance_details.iter().map(|i| i.domain.as_ref()).collect();
+        for i in details.linked_instances {
+          if !crawled_instances.contains(&&*i) && !pending_instances.contains(&i) {
+            pending_instances.push_back(i);
+          }
+        }
+      }
+      Err(e) => eprintln!("Failed to crawl {}: {}", current_instance, e),
+    }
+  }
+
+  Ok(instance_details)
+}
+
+#[derive(Serialize, Clone)]
+pub struct InstanceDetails {
+  pub domain: String,
+  pub name: String,
+  pub version: String,
+  pub icon: Option<String>,
+  pub online_users: i32,
+  pub total_users: i64,
+  pub users_active_halfyear: i64,
+  pub users_active_month: i64,
+  pub open_registrations: bool,
+  pub linked_instances_count: i32,
+  // The following fields are only used for aggregation, but not shown in output
+  #[serde(skip)]
+  pub linked_instances: Vec<String>,
+}
+
+async fn fetch_instance_details(domain: &str) -> Result<InstanceDetails, Error> {
+  let client = Client::default();
+
+  let node_info_url = format!("https://{}/nodeinfo/2.0.json", domain);
+  let node_info_request = client.get(&node_info_url).timeout(REQUEST_TIMEOUT).send();
+
+  let site_info_url = format!("https://{}/api/v2/site", domain);
+  let site_info_request = client.get(&site_info_url).timeout(REQUEST_TIMEOUT).send();
+
+  let (node_info, site_info) = try_join!(node_info_request, site_info_request)?;
+  let node_info: NodeInfo = node_info.json().await?;
+  let site_info: GetSiteResponse = site_info.json().await?;
+
+  let linked_instances = site_info
+    .federated_instances
+    .map(|f| f.linked)
+    .unwrap_or(vec![]);
+  Ok(InstanceDetails {
+    domain: domain.to_owned(),
+    name: site_info.site_view.site.name,
+    version: node_info.version,
+    icon: site_info.site_view.site.icon,
+    online_users: site_info.online as i32,
+    total_users: node_info.usage.users.total,
+    users_active_halfyear: node_info.usage.users.active_halfyear,
+    users_active_month: node_info.usage.users.active_month,
+    open_registrations: node_info.open_registrations,
+    linked_instances_count: linked_instances.len() as i32,
+    linked_instances,
+  })
+}
diff --git a/src/lib.rs b/src/lib.rs
index 34f82e2..cd76424 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,2 +1,8 @@
+use std::time::Duration;
+
 pub mod federated_instances;
 pub mod node_info;
+pub mod crawl;
+
+pub const REQUEST_TIMEOUT: Duration = Duration::from_secs(10);
+pub const START_INSTANCES: [&'static str; 1] = ["lemmy.ml"];
diff --git a/src/main.rs b/src/main.rs
index b5ac432..c84e127 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,14 +1,7 @@
 use anyhow::Error;
-use futures::try_join;
-use lemmy_stats_crawler::federated_instances::GetSiteResponse;
-use lemmy_stats_crawler::node_info::NodeInfo;
-use reqwest::Client;
 use serde::Serialize;
-use std::collections::VecDeque;
-use tokio::time::Duration;
-
-const REQUEST_TIMEOUT: Duration = Duration::from_secs(10);
-const START_INSTANCES: [&'static str; 1] = ["lemmy.ml"];
+use lemmy_stats_crawler::START_INSTANCES;
+use lemmy_stats_crawler::crawl::{crawl, InstanceDetails};
 
 #[tokio::main]
 pub async fn main() -> Result<(), Error> {
@@ -45,76 +38,4 @@ fn aggregate(instance_details: Vec<InstanceDetails>) -> TotalStats {
         total_online_users,
         instance_details,
     }
-}
-
-async fn crawl(start_instances: Vec<String>) -> Result<Vec<InstanceDetails>, Error> {
-    let mut pending_instances = VecDeque::from(start_instances);
-    let mut instance_details = vec![];
-    while let Some(current_instance) = pending_instances.pop_back() {
-        match fetch_instance_details(&current_instance).await {
-            Ok(details) => {
-                instance_details.push(details.to_owned());
-                // add all unknown, linked instances to pending
-                let crawled_instances: &Vec<&str> =
-                    &instance_details.iter().map(|i| i.domain.as_ref()).collect();
-                for i in details.linked_instances {
-                    if !crawled_instances.contains(&&*i) && !pending_instances.contains(&i) {
-                        pending_instances.push_back(i);
-                    }
-                }
-            }
-            Err(e) => eprintln!("Failed to crawl {}: {}", current_instance, e),
-        }
-    }
-
-    Ok(instance_details)
-}
-
-#[derive(Serialize, Clone)]
-struct InstanceDetails {
-    domain: String,
-    name: String,
-    version: String,
-    icon: Option<String>,
-    online_users: i32,
-    total_users: i64,
-    users_active_halfyear: i64,
-    users_active_month: i64,
-    open_registrations: bool,
-    linked_instances_count: i32,
-    // The following fields are only used for aggregation, but not shown in output
-    #[serde(skip)]
-    linked_instances: Vec<String>,
-}
-
-async fn fetch_instance_details(domain: &str) -> Result<InstanceDetails, Error> {
-    let client = Client::default();
-
-    let node_info_url = format!("https://{}/nodeinfo/2.0.json", domain);
-    let node_info_request = client.get(&node_info_url).timeout(REQUEST_TIMEOUT).send();
-
-    let site_info_url = format!("https://{}/api/v2/site", domain);
-    let site_info_request = client.get(&site_info_url).timeout(REQUEST_TIMEOUT).send();
-
-    let (node_info, site_info) = try_join!(node_info_request, site_info_request)?;
-    let node_info: NodeInfo = node_info.json().await?;
-    let site_info: GetSiteResponse = site_info.json().await?;
-
-    let linked_instances = site_info
-        .federated_instances
-        .map(|f| f.linked)
-        .unwrap_or(vec![]);
-    Ok(InstanceDetails {
-        domain: domain.to_owned(),
-        name: site_info.site_view.site.name,
-        version: node_info.version,
-        icon: site_info.site_view.site.icon,
-        online_users: site_info.online as i32,
-        total_users: node_info.usage.users.total,
-        users_active_halfyear: node_info.usage.users.active_halfyear,
-        users_active_month: node_info.usage.users.active_month,
-        open_registrations: node_info.open_registrations,
-        linked_instances_count: linked_instances.len() as i32,
-        linked_instances,
-    })
-}
+}
\ No newline at end of file