diff --git a/src/to-json/src/ffi.rs b/src/to-json/src/ffi.rs
index dcaf66d..f728598 100644
--- a/src/to-json/src/ffi.rs
+++ b/src/to-json/src/ffi.rs
@@ -1,4 +1,4 @@
-use crate::convert::to_json;
+use crate::json::to_json;
 use std::ffi::{c_char, CStr, CString};
 
 fn to_c_string(string: String) -> *const c_char { // fetch c-style ptr of string
diff --git a/src/to-json/src/convert.rs b/src/to-json/src/json.rs
similarity index 63%
rename from src/to-json/src/convert.rs
rename to src/to-json/src/json.rs
index 9393fad..8f79d44 100644
--- a/src/to-json/src/convert.rs
+++ b/src/to-json/src/json.rs
@@ -1,10 +1,11 @@
+use serde_json as json;
 use crate::parser::{parser, Value};
 
 fn json_convert(content: &str) -> Result<String, String> { // convert to JSON format
     let data = match parser(content)? {
-        Value::JSON(json) => serde_json::to_string(&json),
-        Value::YAML(yaml) => serde_json::to_string(&yaml),
-        Value::TOML(toml) => serde_json::to_string(&toml),
+        Value::JSON(_json) => json::to_string(&_json),
+        Value::YAML(_yaml) => json::to_string(&_yaml),
+        Value::TOML(_toml) => json::to_string(&_toml),
     };
     match data {
         Ok(data) => Ok(data),
@@ -15,6 +16,6 @@ fn json_convert(content: &str) -> Result<String, String> { // convert to JSON fo
 pub fn to_json(content: &str) -> Option<String> { // to JSON string
     match json_convert(content) {
         Ok(data) => Some(data),
-        Err(_) => None,
+        Err(_) => None, // convert failed
     }
 }
diff --git a/src/to-json/src/lib.rs b/src/to-json/src/lib.rs
index f04b9c3..d5af57d 100644
--- a/src/to-json/src/lib.rs
+++ b/src/to-json/src/lib.rs
@@ -1,4 +1,4 @@
 mod ffi;
+mod json;
 mod tests;
 mod parser;
-mod convert;
diff --git a/src/to-json/src/tests.rs b/src/to-json/src/tests.rs
index ee74871..3c832c9 100644
--- a/src/to-json/src/tests.rs
+++ b/src/to-json/src/tests.rs
@@ -1,4 +1,4 @@
-use crate::convert::to_json;
+use crate::json::to_json;
 
 #[allow(dead_code)]
 const JSON_TEST_CONTENT: &str = r#"