diff --git a/src/extension/clipboard.rs b/src/extension/clipboard.rs
new file mode 100644
index 0000000..778bbfe
--- /dev/null
+++ b/src/extension/clipboard.rs
@@ -0,0 +1,43 @@
+/*
+ * This file is part of espanso.
+ *
+ * Copyright (C) 2020 Federico Terzi
+ *
+ * espanso is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * espanso is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with espanso.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+use serde_yaml::{Mapping, Value};
+use crate::clipboard::ClipboardManager;
+
+pub struct ClipboardExtension {
+    clipboard_manager: Box<dyn ClipboardManager>,
+}
+
+impl ClipboardExtension {
+    pub fn new(clipboard_manager: Box<dyn ClipboardManager>) -> ClipboardExtension {
+        ClipboardExtension{
+            clipboard_manager
+        }
+    }
+}
+
+impl super::Extension for ClipboardExtension {
+    fn name(&self) -> String {
+        String::from("clipboard")
+    }
+
+    fn calculate(&self, params: &Mapping, _: &Vec<String>) -> Option<String> {
+        self.clipboard_manager.get_clipboard()
+    }
+}
\ No newline at end of file
diff --git a/src/extension/mod.rs b/src/extension/mod.rs
index 047060d..9db489a 100644
--- a/src/extension/mod.rs
+++ b/src/extension/mod.rs
@@ -18,24 +18,27 @@
  */
 
 use serde_yaml::Mapping;
+use crate::clipboard::ClipboardManager;
 
 mod date;
 mod shell;
 mod script;
 mod random;
-mod dummy;
+mod clipboard;
+pub mod dummy;
 
 pub trait Extension {
     fn name(&self) -> String;
     fn calculate(&self, params: &Mapping, args: &Vec<String>) -> Option<String>;
 }
 
-pub fn get_extensions() -> Vec<Box<dyn Extension>> {
+pub fn get_extensions(clipboard_manager: Box<dyn ClipboardManager>) -> Vec<Box<dyn Extension>>{
     vec![
         Box::new(date::DateExtension::new()),
         Box::new(shell::ShellExtension::new()),
         Box::new(script::ScriptExtension::new()),
         Box::new(random::RandomExtension::new()),
         Box::new(dummy::DummyExtension::new()),
+        Box::new(clipboard::ClipboardExtension::new(clipboard_manager)),
     ]
 }
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index bca0ebd..78e8d0d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -344,7 +344,7 @@ fn daemon_background(receive_channel: Receiver<Event>, config_set: ConfigSet) {
 
     let keyboard_manager = keyboard::get_manager();
 
-    let extensions = extension::get_extensions();
+    let extensions = extension::get_extensions(Box::new(clipboard::get_manager()));
 
     let renderer = render::default::DefaultRenderer::new(extensions,
                                                           config_manager.default_config().clone());
diff --git a/src/matcher/mod.rs b/src/matcher/mod.rs
index 3e9c294..e322355 100644
--- a/src/matcher/mod.rs
+++ b/src/matcher/mod.rs
@@ -218,9 +218,12 @@ pub struct MatchVariable {
     #[serde(rename = "type")]
     pub var_type: String,
 
+    #[serde(default = "default_params")]
     pub params: Mapping,
 }
 
+fn default_params() -> Mapping {Mapping::new()}
+
 #[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
 pub enum TriggerEntry {
     Char(char),
diff --git a/src/render/default.rs b/src/render/default.rs
index adfed8e..dca2c70 100644
--- a/src/render/default.rs
+++ b/src/render/default.rs
@@ -271,7 +271,7 @@ mod tests {
     use super::*;
 
     fn get_renderer(config: Configs) -> DefaultRenderer {
-        DefaultRenderer::new(crate::extension::get_extensions(), config)
+        DefaultRenderer::new(vec![Box::new(crate::extension::dummy::DummyExtension::new())], config)
     }
 
     fn get_config_for(s: &str) -> Configs {