diff --git a/src/errors.rs b/src/errors.rs
index 673d956..d018b34 100644
--- a/src/errors.rs
+++ b/src/errors.rs
@@ -64,6 +64,13 @@ pub enum Error {
     /// Error deserializing from toml
     #[error("Error deserializing from toml")]
     TomlDe(#[from] TomlDeError),
+
+    #[cfg(any(feature = "toml", feature = "json"))]
+    /// Error raised in the helpers::json::to_writer or helpers::toml::to_writer function if not
+    /// all bytes were written to the writer
+    #[error("Not all bytes were written")]
+    NotAllBytesWritten,
+
     /// Error converting an http header to a string
     #[error("Error converting an http header to a string")]
     HeaderStrError(#[from] HeaderStrError),
diff --git a/src/helpers/json.rs b/src/helpers/json.rs
index e12e602..ea0cb43 100644
--- a/src/helpers/json.rs
+++ b/src/helpers/json.rs
@@ -48,8 +48,11 @@ pub fn to_vec(data: &Data) -> Result<Vec<u8>> {
 pub fn to_writer<W: Write>(data: &Data, writer: W) -> Result<()> {
     let mut buf_writer = BufWriter::new(writer);
     let vec = to_vec(data)?;
-    buf_writer.write(&vec)?;
-    Ok(())
+    if vec.len() != buf_writer.write(&vec)? {
+        Err(crate::Error::NotAllBytesWritten)
+    } else {
+        Ok(())
+    }
 }
 
 /// Attempts to serialize a Data struct to a file
diff --git a/src/helpers/toml.rs b/src/helpers/toml.rs
index 086bbe2..620a845 100644
--- a/src/helpers/toml.rs
+++ b/src/helpers/toml.rs
@@ -48,8 +48,11 @@ pub fn to_vec(data: &Data) -> Result<Vec<u8>> {
 pub fn to_writer<W: Write>(data: &Data, writer: W) -> Result<()> {
     let mut buf_writer = BufWriter::new(writer);
     let vec = to_vec(data)?;
-    buf_writer.write(&vec)?;
-    Ok(())
+    if vec.len() != !buf_writer.write(&vec)? {
+        Err(crate::Error::NotAllBytesWritten)
+    } else {
+        Ok(())
+    }
 }
 
 /// Attempts to serialize a Data struct to a file