diff --git a/src/error.rs b/src/error.rs
new file mode 100644
index 0000000..6e47893
--- /dev/null
+++ b/src/error.rs
@@ -0,0 +1,77 @@
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum ConfigForgeError {
+    #[error("Unsupported format '{format}'. Supported formats: json, yaml, toml, env, ini")]
+    UnsupportedFormat { format: String },
+
+    #[error("File '{path}' not found")]
+    FileNotFound { path: String },
+
+    #[error("Failed to parse {format} file: {details}")]
+    ParseError { format: String, details: String },
+
+    #[error("Validation failed at {path}: {reason}")]
+    ValidationError { path: String, reason: String },
+
+    #[error("Invalid JSON Schema: {details}")]
+    SchemaParseError { details: String },
+
+    #[error("IO error: {details}")]
+    IoError { details: String },
+
+    #[error("Conversion error: {details}")]
+    ConversionError { details: String },
+
+    #[error("Schema inference error: {details}")]
+    SchemaInferenceError { details: String },
+
+    #[error("TypeScript generation error: {details}")]
+    TypeScriptError { details: String },
+}
+
+impl From<std::io::Error> for ConfigForgeError {
+    fn from(e: std::io::Error) -> Self {
+        ConfigForgeError::IoError {
+            details: e.to_string(),
+        }
+    }
+}
+
+impl From<serde_json::Error> for ConfigForgeError {
+    fn from(e: serde_json::Error) -> Self {
+        ConfigForgeError::ParseError {
+            format: "JSON".to_string(),
+            details: e.to_string(),
+        }
+    }
+}
+
+impl From<serde_yaml::Error> for ConfigForgeError {
+    fn from(e: serde_yaml::Error) -> Self {
+        ConfigForgeError::ParseError {
+            format: "YAML".to_string(),
+            details: e.to_string(),
+        }
+    }
+}
+
+impl From<toml::Error> for ConfigForgeError {
+    fn from(e: toml::Error) -> Self {
+        ConfigForgeError::ParseError {
+            format: "TOML".to_string(),
+            details: e.to_string(),
+        }
+    }
+}
+
+impl From<ini::Error> for ConfigForgeError {
+    fn from(e: ini::Error) -> Self {
+        ConfigForgeError::ParseError {
+            format: "INI".to_string(),
+            details: e.to_string(),
+        }
+    }
+}
+
+pub type Result<T> = std::result::Result<T, ConfigForgeError>;