add support for serde_json::Error behind feature flag

Cargo.toml

@@ -7,6 +7,8 @@ description = "Error wrapper that with a message"
 license = "MIT"
 keywords = ["error", "result"]
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
 [dependencies]
+serde_json = { version = "1.0", optional = true }
+
+[features]
+default = []

src/lib.rs

@@ -56,3 +56,14 @@ impl From<Box<dyn Error>> for Rear {
 		}
 	}
 }
+
+#[cfg(feature = "serde_json")]
+impl From<serde_json::Error> for Rear {
+	fn from(error: serde_json::Error) -> Self {
+		let message: String = error.to_string();
+		Self {
+			error: error.into(),
+			message: message,
+		}
+	}
+}