diff --git a/src/to-json/src/parser.rs b/src/to-json/src/parser.rs
new file mode 100644
index 0000000..1d84d18
--- /dev/null
+++ b/src/to-json/src/parser.rs
@@ -0,0 +1,43 @@
+use serde_json as json;
+use serde_yaml as yaml;
+
+#[derive(Debug)]
+pub enum Value {
+    JSON(json::Value),
+    YAML(yaml::Value),
+    TOML(toml::Value),
+}
+
+fn json_parser(content: &str) -> Option<json::Value> { // parse json content
+    match json::from_str::<json::Value>(content) {
+        Ok(result) => Some(result),
+        Err(_) => None,
+    }
+}
+
+fn yaml_parser(content: &str) -> Option<yaml::Value> { // parse yaml content
+    match yaml::from_str::<yaml::Value>(content) {
+        Ok(result) => Some(result),
+        Err(_) => None,
+    }
+}
+
+fn toml_parser(content: &str) -> Option<toml::Value> { // parse toml content
+    match toml::from_str::<toml::Value>(content) {
+        Ok(result) => Some(result),
+        Err(_) => None,
+    }
+}
+
+pub fn parser(content: &str) -> Result<Value, String> {
+    match json_parser(content) { // try JSON format
+        Some(data) => Ok(Value::JSON(data)),
+        None => match toml_parser(content) { // try TOML format
+            Some(data) => Ok(Value::TOML(data)),
+            None => match yaml_parser(content) { // try YAML format
+                Some(data) => Ok(Value::YAML(data)),
+                None => Err(String::from("unknown input format")),
+            }
+        }
+    }
+}