diff --git a/src/to-json/src/json.rs b/src/to-json/src/json.rs
deleted file mode 100644
index 83efc4c..0000000
--- a/src/to-json/src/json.rs
+++ /dev/null
@@ -1,32 +0,0 @@
-use serde_json as json;
-use serde_yaml as yaml;
-
-enum Format {
-    JSON(json::Value),
-    YAML(yaml::Value),
-    TOML(toml::Value),
-}
-
-fn parser(content: &str) -> Option<Format> {
-    if let Ok(data) = json::from_str::<json::Value>(content) { // try JSON format
-        return Some(Format::JSON(data));
-    }
-    if let Ok(data) = toml::from_str::<toml::Value>(content) { // try TOML format
-        return Some(Format::TOML(data));
-    }
-    if let Ok(data) = yaml::from_str::<yaml::Value>(content) { // try YAML format
-        return Some(Format::YAML(data));
-    }
-    return None; // parse failed
-}
-
-pub fn to_json(content: &str) -> String { // convert to JSON format
-    match parser(content) {
-        Some(data) => match data {
-            Format::JSON(dat) => json::to_string(&dat).unwrap(),
-            Format::YAML(dat) => json::to_string(&dat).unwrap(),
-            Format::TOML(dat) => json::to_string(&dat).unwrap(),
-        },
-        None => String::from(""), // failed -> empty string
-    }
-}
diff --git a/src/to-json/src/lib.rs b/src/to-json/src/lib.rs
index ce4d1e6..768c005 100644
--- a/src/to-json/src/lib.rs
+++ b/src/to-json/src/lib.rs
@@ -1,4 +1,3 @@
 mod ffi;
-mod json;
 mod parser;
 mod convert;