diff --git a/src/api.rs b/src/api.rs
new file mode 100644
index 0000000..3af847b
--- /dev/null
+++ b/src/api.rs
@@ -0,0 +1,118 @@
+use console::style;
+use serde::Deserialize;
+use std::collections::HashMap;
+
+#[derive(Deserialize, Debug)]
+pub struct SearchResponse {
+    pub hits: Vec<ModResult>,
+    pub offset: isize,
+    pub limit: isize,
+    pub total_hits: isize,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct ModResult {
+    pub mod_id: String,               // TODO parse to `local-xxxxx` with regex
+    pub project_type: Option<String>, // NOTE this isn't in all search results?
+    pub author: String,
+    pub title: String,
+    pub description: String,
+    pub categories: Vec<String>,
+    pub versions: Vec<String>,
+    pub downloads: isize,
+    pub page_url: String,
+    pub icon_url: String,
+    pub author_url: String,
+    pub date_created: String,
+    pub date_modified: String,
+    pub latest_version: String,
+    pub license: String,
+    pub client_side: String,
+    pub server_side: String,
+    pub host: String,
+}
+
+impl ModResult {
+    pub fn format_info(&self) -> String {
+        let title = style(self.title.clone()).bold();
+        let downloads = style(self.downloads.clone()).bold().green();
+        if let Some(latest_release) = self.versions.last() {
+            // TODO fetch version numbers to display
+            let latest_release = style(latest_release).bold().blue();
+            format!("{} [{}] ({} downloads)", title, latest_release, downloads)
+        } else {
+            format!("{} [no releases]", title)
+        }
+    }
+
+    pub fn format_description(&self) -> String {
+        self.description.to_owned()
+    }
+
+    pub fn display(&self, index: usize) {
+        let index = style(index).magenta();
+        let info = self.format_info();
+        let description = self.format_description();
+        println!("{:>2} {}\n    {}", index, info, description);
+    }
+}
+
+#[derive(Deserialize, Debug)]
+pub struct ModInfo {
+    pub id: String, // TODO serialize mod id?
+    pub slug: String,
+    pub team: String, // TODO serialize team id?
+    pub title: String,
+    pub description: String,
+    pub body: String,
+    pub published: String, // TODO serialize datetime
+    pub updated: String,   // TODO serialize datetime
+    pub status: String,
+    pub license: License,
+    pub client_side: String, // TODO serialize as enum
+    pub server_side: String, // TODO serialize as enum
+    pub downloads: isize,
+    pub followers: isize,
+    pub categories: Vec<String>,
+    pub versions: Vec<String>,
+    pub icon_url: Option<String>,
+    pub issues_url: Option<String>,
+    pub source_url: Option<String>,
+    pub wiki_url: Option<String>,
+    pub discord_url: Option<String>,
+    pub donation_urls: Vec<String>,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct License {
+    pub id: String,
+    pub name: String,
+    pub url: String,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct ModVersion {
+    pub id: String,        // version id
+    pub mod_id: String,    // mod id
+    pub author_id: String, // user id
+    // NOTE modrinth docs list this as a String, but is actually a bool?
+    // featured: String,  // user id
+    pub name: String,
+    pub version_number: String,
+    pub changelog: Option<String>,
+    pub changelog_url: Option<String>,
+    pub date_published: String, // TODO serialize datetime
+    pub downloads: isize,
+    pub version_type: String, // TODO {alpha | beta | release}
+    pub files: Vec<ModVersionFile>,
+    pub dependencies: Vec<String>, // TODO dependency wrangling, thank you modrinth, very cool
+    pub game_versions: Vec<String>,
+    pub loaders: Vec<String>,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct ModVersionFile {
+    pub hashes: HashMap<String, String>,
+    pub url: String,
+    pub filename: String,
+}
diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..d715e8c
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,102 @@
+use serde::{Deserialize, Serialize};
+use std::path::PathBuf;
+use structopt::StructOpt;
+
+// TODO parameter to restrict target Minecraft version
+#[derive(StructOpt, Clone, Debug)]
+pub struct SearchArgs {
+    pub package_name: String,
+
+    /// Restricts the target Minecraft version
+    #[structopt(short, long)]
+    pub version: Option<Vec<String>>,
+}
+
+// TODO use ColoredHelp by default?
+#[derive(StructOpt, Clone, Debug)]
+pub enum Command {
+    /// Adds a mod to the current instance
+    #[structopt(setting = structopt::clap::AppSettings::ColoredHelp)]
+    Add(SearchArgs),
+    /// Removes a mod
+    #[structopt(setting = structopt::clap::AppSettings::ColoredHelp)]
+    Remove { package_name: String },
+    #[structopt(setting = structopt::clap::AppSettings::ColoredHelp)]
+    Get(SearchArgs),
+    #[structopt(setting = structopt::clap::AppSettings::ColoredHelp)]
+    Update,
+    #[structopt(setting = structopt::clap::AppSettings::ColoredHelp)]
+    Clean,
+}
+
+// TODO move main body argument fields to substruct for ease of moving?
+#[derive(StructOpt, Clone, Debug)]
+#[structopt(name = "hopper", setting = structopt::clap::AppSettings::ColoredHelp)]
+pub struct Args {
+    /// Path to configuration file
+    #[structopt(short, long, parse(from_os_str))]
+    pub config: Option<PathBuf>,
+
+    /// Path to mod lockfile
+    #[structopt(short, long, parse(from_os_str))]
+    pub lockfile: Option<PathBuf>,
+
+    /// Auto-accept confirmation dialogues
+    #[structopt(short = "y", long = "yes")]
+    pub auto_accept: bool,
+
+    #[structopt(subcommand)]
+    pub command: Command,
+}
+
+impl Args {
+    pub fn load_config(&self) -> Result<Config, confy::ConfyError> {
+        if let Some(config_path) = &self.config {
+            confy::load_path(config_path)
+        } else {
+            confy::load("hopper")
+        }
+    }
+}
+
+#[derive(Deserialize, Serialize, Debug)]
+pub struct Upstream {
+    /// Modrinth main server address
+    pub server_address: String,
+}
+
+impl Default for Upstream {
+    fn default() -> Self {
+        Self {
+            server_address: "api.modrinth.com".into(),
+        }
+    }
+}
+
+#[derive(Deserialize, Serialize, Debug)]
+pub struct Options {
+    /// Whether to reverse search results
+    pub reverse_search: bool,
+}
+
+impl Default for Options {
+    fn default() -> Self {
+        Self {
+            reverse_search: true,
+        }
+    }
+}
+
+#[derive(Deserialize, Serialize, Debug, Default)]
+pub struct Config {
+    /// General settings
+    pub options: Options,
+
+    /// Configuration for the upstream Modrinth server
+    pub upstream: Upstream,
+}
+
+pub struct AppContext {
+    pub args: Args,
+    pub config: Config,
+}
diff --git a/src/main.rs b/src/main.rs
index 679de8f..8b91853 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,226 +1,14 @@
-use console::style;
-use log::*;
 use futures_util::StreamExt;
-use serde::{Deserialize, Serialize};
+use log::*;
 use std::cmp::min;
-use std::collections::HashMap;
 use std::io::Write;
-use std::path::PathBuf;
 use structopt::StructOpt;
 
-// TODO parameter to restrict target Minecraft version
-#[derive(StructOpt, Clone, Debug)]
-struct SearchArgs {
-    package_name: String,
+mod api;
+mod config;
 
-    /// Restricts the target Minecraft version
-    #[structopt(short, long)]
-    version: Option<Vec<String>>,
-}
-
-// TODO use ColoredHelp by default?
-#[derive(StructOpt, Clone, Debug)]
-enum Command {
-    /// Adds a mod to the current instance
-    #[structopt(setting = structopt::clap::AppSettings::ColoredHelp)]
-    Add(SearchArgs),
-    /// Removes a mod
-    #[structopt(setting = structopt::clap::AppSettings::ColoredHelp)]
-    Remove { package_name: String },
-    #[structopt(setting = structopt::clap::AppSettings::ColoredHelp)]
-    Get(SearchArgs),
-    #[structopt(setting = structopt::clap::AppSettings::ColoredHelp)]
-    Update,
-    #[structopt(setting = structopt::clap::AppSettings::ColoredHelp)]
-    Clean,
-}
-
-// TODO move main body argument fields to substruct for ease of moving?
-#[derive(StructOpt, Clone, Debug)]
-#[structopt(name = "hopper", setting = structopt::clap::AppSettings::ColoredHelp)]
-struct Args {
-    /// Path to configuration file
-    #[structopt(short, long, parse(from_os_str))]
-    config: Option<PathBuf>,
-
-    /// Path to mod lockfile
-    #[structopt(short, long, parse(from_os_str))]
-    lockfile: Option<PathBuf>,
-
-    /// Auto-accept confirmation dialogues
-    #[structopt(short = "y", long = "yes")]
-    auto_accept: bool,
-
-    #[structopt(subcommand)]
-    command: Command,
-}
-
-impl Args {
-    fn load_config(&self) -> Result<Config, confy::ConfyError> {
-        if let Some(config_path) = &self.config {
-            confy::load_path(config_path)
-        } else {
-            confy::load("hopper")
-        }
-    }
-}
-
-#[derive(Deserialize, Serialize, Debug)]
-struct Upstream {
-    /// Modrinth main server address
-    server_address: String,
-}
-
-impl Default for Upstream {
-    fn default() -> Self {
-        Self {
-            server_address: "api.modrinth.com".into(),
-        }
-    }
-}
-
-#[derive(Deserialize, Serialize, Debug)]
-struct Options {
-    /// Whether to reverse search results
-    reverse_search: bool,
-}
-
-impl Default for Options {
-    fn default() -> Self {
-        Self {
-            reverse_search: true,
-        }
-    }
-}
-
-#[derive(Deserialize, Serialize, Debug, Default)]
-struct Config {
-    /// General settings
-    options: Options,
-
-    /// Configuration for the upstream Modrinth server
-    upstream: Upstream,
-}
-
-struct AppContext {
-    pub args: Args,
-    pub config: Config,
-}
-
-#[derive(Deserialize, Debug)]
-struct SearchResponse {
-    hits: Vec<ModResult>,
-    offset: isize,
-    limit: isize,
-    total_hits: isize,
-}
-
-#[derive(Deserialize, Debug)]
-struct ModResult {
-    mod_id: String,               // TODO parse to `local-xxxxx` with regex
-    project_type: Option<String>, // NOTE this isn't in all search results?
-    author: String,
-    title: String,
-    description: String,
-    categories: Vec<String>,
-    versions: Vec<String>,
-    downloads: isize,
-    page_url: String,
-    icon_url: String,
-    author_url: String,
-    date_created: String,
-    date_modified: String,
-    latest_version: String,
-    license: String,
-    client_side: String,
-    server_side: String,
-    host: String,
-}
-
-impl ModResult {
-    fn format_info(&self) -> String {
-        let title = style(self.title.clone()).bold();
-        let downloads = style(self.downloads.clone()).bold().green();
-        if let Some(latest_release) = self.versions.last() {
-            // TODO fetch version numbers to display
-            let latest_release = style(latest_release).bold().blue();
-            format!("{} [{}] ({} downloads)", title, latest_release, downloads)
-        } else {
-            format!("{} [no releases]", title)
-        }
-    }
-
-    fn format_description(&self) -> String {
-        self.description.to_owned()
-    }
-
-    fn display(&self, index: usize) {
-        let index = style(index).magenta();
-        let info = self.format_info();
-        let description = self.format_description();
-        println!("{:>2} {}\n    {}", index, info, description);
-    }
-}
-
-#[derive(Deserialize, Debug)]
-struct ModInfo {
-    id: String, // TODO serialize mod id?
-    slug: String,
-    team: String, // TODO serialize team id?
-    title: String,
-    description: String,
-    body: String,
-    published: String, // TODO serialize datetime
-    updated: String,   // TODO serialize datetime
-    status: String,
-    license: License,
-    client_side: String, // TODO serialize as enum
-    server_side: String, // TODO serialize as enum
-    downloads: isize,
-    followers: isize,
-    categories: Vec<String>,
-    versions: Vec<String>,
-    icon_url: Option<String>,
-    issues_url: Option<String>,
-    source_url: Option<String>,
-    wiki_url: Option<String>,
-    discord_url: Option<String>,
-    donation_urls: Vec<String>,
-}
-
-#[derive(Deserialize, Debug)]
-struct License {
-    id: String,
-    name: String,
-    url: String,
-}
-
-#[derive(Deserialize, Debug)]
-struct ModVersion {
-    id: String,        // version id
-    mod_id: String,    // mod id
-    author_id: String, // user id
-    // NOTE modrinth docs list this as a String, but is actually a bool?
-    // featured: String,  // user id
-    name: String,
-    version_number: String,
-    changelog: Option<String>,
-    changelog_url: Option<String>,
-    date_published: String, // TODO serialize datetime
-    downloads: isize,
-    version_type: String, // TODO {alpha | beta | release}
-    files: Vec<ModVersionFile>,
-    dependencies: Vec<String>, // TODO dependency wrangling, thank you modrinth, very cool
-    game_versions: Vec<String>,
-    loaders: Vec<String>,
-}
-
-#[derive(Deserialize, Debug)]
-struct ModVersionFile {
-    hashes: HashMap<String, String>,
-    url: String,
-    filename: String,
-}
+use api::*;
+use config::*;
 
 async fn search_mods(ctx: &AppContext, search_args: &SearchArgs) -> anyhow::Result<SearchResponse> {
     let client = reqwest::Client::new();