diff --git a/packages/fortifier-macros/src/validate.rs b/packages/fortifier-macros/src/validate.rs
index 9c64cc7..b13f029 100644
--- a/packages/fortifier-macros/src/validate.rs
+++ b/packages/fortifier-macros/src/validate.rs
@@ -3,6 +3,7 @@ mod r#enum;
 mod field;
 mod fields;
 mod r#struct;
+mod r#type;
 mod r#union;
 
 use proc_macro2::TokenStream;
diff --git a/packages/fortifier-macros/src/validate/attributes.rs b/packages/fortifier-macros/src/validate/attributes.rs
index a195a81..cdbf04b 100644
--- a/packages/fortifier-macros/src/validate/attributes.rs
+++ b/packages/fortifier-macros/src/validate/attributes.rs
@@ -2,6 +2,7 @@ use proc_macro2::TokenStream;
 use quote::quote;
 
 pub fn enum_attributes() -> TokenStream {
+    #[allow(unused_mut)]
     let mut attributes: Vec<TokenStream> = vec![];
 
     #[cfg(feature = "serde")]
@@ -12,7 +13,6 @@ pub fn enum_attributes() -> TokenStream {
             attributes.push(quote! {
                 #[derive(serde::Deserialize, serde::Serialize)]
                 #[serde(
-                    // TODO: Tag?
                     tag = "path",
                     rename_all = "camelCase",
                     rename_all_fields = "camelCase"
diff --git a/packages/fortifier-macros/src/validate/field.rs b/packages/fortifier-macros/src/validate/field.rs
index 28a50e7..e41b3c1 100644
--- a/packages/fortifier-macros/src/validate/field.rs
+++ b/packages/fortifier-macros/src/validate/field.rs
@@ -4,7 +4,7 @@ use quote::{ToTokens, format_ident, quote};
 use syn::{Field, Ident, Result, Visibility};
 
 use crate::{
-    validate::attributes::enum_attributes,
+    validate::{attributes::enum_attributes, r#type::should_validate_type},
     validation::{Execution, Validation},
     validations::{Custom, Email, Length, Regex, Url},
 };
@@ -60,6 +60,7 @@ impl<'a> ValidateField<'a> {
             error_type_ident,
             validations: vec![],
         };
+        let mut skip = false;
 
         for attr in &field.attrs {
             if attr.path().is_ident("validate") {
@@ -83,6 +84,10 @@ impl<'a> ValidateField<'a> {
                     } else if meta.path.is_ident("url") {
                         result.validations.push(Box::new(Url::parse(&meta)?));
 
+                        Ok(())
+                    } else if meta.path.is_ident("skip") {
+                        skip = true;
+
                         Ok(())
                     } else {
                         Err(meta.error("unknown parameter"))
@@ -91,6 +96,10 @@ impl<'a> ValidateField<'a> {
             }
         }
 
+        if !skip && should_validate_type(&field.ty) {
+            // TODO: Nested validation
+        }
+
         Ok(result)
     }
 
diff --git a/packages/fortifier-macros/src/validate/type.rs b/packages/fortifier-macros/src/validate/type.rs
new file mode 100644
index 0000000..269661a
--- /dev/null
+++ b/packages/fortifier-macros/src/validate/type.rs
@@ -0,0 +1,191 @@
+use syn::{GenericArgument, Path, PathArguments, Type, TypeParamBound};
+
+const PRIMITIVE_AND_BUILT_IN_TYPES: [&str; 18] = [
+    "bool", "i8", "i16", "i32", "i64", "i128", "isize", "u8", "u16", "u32", "u64", "u128", "usize",
+    "f32", "f64", "char", "str", "String",
+];
+
+const CONTAINER_TYPES: [&str; 20] = [
+    "Arc",
+    "BTreeMap",
+    "BTreeSet",
+    "HashMap",
+    "HashSet",
+    "LinkedList",
+    "Option",
+    "Rc",
+    "Vec",
+    "VecDeque",
+    "std::collections::BTreeMap",
+    "std::collections::BTreeSet",
+    "std::collections::HashMap",
+    "std::collections::HashSet",
+    "std::collections::LinkedList",
+    "std::collections::VecDeque",
+    "std::option::Option",
+    "std::rc::Rc",
+    "std::sync::Arc",
+    "std::vec::Vec",
+];
+
+fn path_to_string(path: &Path) -> String {
+    // TODO: This is probably slow, replace with comparisons.
+    path.segments
+        .iter()
+        .map(|segment| segment.ident.to_string())
+        .collect::<Vec<_>>()
+        .join("::")
+}
+
+fn is_validate_path(path: &Path) -> bool {
+    let path_string = path_to_string(path);
+    path_string == "Validate" || path_string == "fortifier::Validate"
+}
+
+fn should_validate_generic_argument(arg: &GenericArgument) -> bool {
+    match arg {
+        GenericArgument::Lifetime(_) => true,
+        GenericArgument::Type(r#type) => should_validate_type(r#type),
+        GenericArgument::Const(_expr) => todo!(),
+        GenericArgument::AssocType(_assoc_type) => todo!(),
+        GenericArgument::AssocConst(_assoc_const) => todo!(),
+        GenericArgument::Constraint(_constraint) => todo!(),
+        _ => true,
+    }
+}
+
+fn should_validate_path(path: &Path) -> bool {
+    if let Some(ident) = path.get_ident() {
+        return !PRIMITIVE_AND_BUILT_IN_TYPES.contains(&ident.to_string().as_str());
+    }
+    let path_string = path_to_string(path);
+
+    if CONTAINER_TYPES.contains(&path_string.as_str())
+        && let Some(segment) = path.segments.last()
+        && let PathArguments::AngleBracketed(arguments) = &segment.arguments
+        && !arguments.args.iter().all(should_validate_generic_argument)
+    {
+        return false;
+    }
+
+    true
+}
+
+pub fn should_validate_type(r#type: &Type) -> bool {
+    match r#type {
+        Type::Array(r#type) => should_validate_type(&r#type.elem),
+        Type::BareFn(_) => false,
+        Type::Group(r#type) => should_validate_type(&r#type.elem),
+        Type::ImplTrait(r#type) => r#type.bounds.iter().any(
+            |bound| matches!(bound, TypeParamBound::Trait(bound) if is_validate_path(&bound.path)),
+        ),
+        Type::Infer(_) => true,
+        Type::Macro(_) => true,
+        Type::Never(_) => false,
+        Type::Paren(r#type) => should_validate_type(&r#type.elem),
+        Type::Path(r#type) => should_validate_path(&r#type.path),
+        Type::Ptr(r#type) => should_validate_type(&r#type.elem),
+        Type::Reference(r#type) => should_validate_type(&r#type.elem),
+        Type::Slice(r#type) => should_validate_type(&r#type.elem),
+        Type::TraitObject(r#type) => r#type.bounds.iter().any(
+            |bound| matches!(bound, TypeParamBound::Trait(bound) if is_validate_path(&bound.path)),
+        ),
+        Type::Tuple(r#type) => {
+            !r#type.elems.is_empty() && r#type.elems.iter().all(should_validate_type)
+        }
+        Type::Verbatim(_) => false,
+        _ => false,
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use proc_macro2::TokenStream;
+    use quote::quote;
+
+    use super::should_validate_type;
+
+    fn validate(tokens: TokenStream) -> bool {
+        should_validate_type(&syn::parse2(tokens).expect("Type should be valid."))
+    }
+
+    #[test]
+    fn should_validate() {
+        assert!(validate(quote!(&T)));
+        assert!(validate(quote!(T)));
+
+        assert!(validate(quote!((T, T))));
+        assert!(validate(quote!((A, B, C))));
+
+        assert!(validate(quote!([T])));
+        assert!(validate(quote!([T; 3])));
+        assert!(validate(quote!([&T])));
+        assert!(validate(quote!([&T; 3])));
+        assert!(validate(quote!(&[T])));
+        assert!(validate(quote!(&[T; 3])));
+
+        assert!(validate(quote!(Arc<T>)));
+        assert!(validate(quote!(BTreeSet<T>)));
+        assert!(validate(quote!(BTreeMap<K, V>)));
+        assert!(validate(quote!(HashSet<T>)));
+        assert!(validate(quote!(HashMap<K, V>)));
+        assert!(validate(quote!(LinkedList<T>)));
+        assert!(validate(quote!(Option<T>)));
+        assert!(validate(quote!(Option<Option<T>>)));
+        assert!(validate(quote!(Rc<T>)));
+        assert!(validate(quote!(Vec<T>)));
+        assert!(validate(quote!(VecDeque<T>)));
+
+        assert!(validate(quote!(impl Validate)));
+        assert!(validate(quote!(impl fortifier::Validate)));
+        assert!(validate(quote!(dyn Validate)));
+        assert!(validate(quote!(dyn ::fortifier::Validate)));
+    }
+
+    #[test]
+    fn should_not_validate() {
+        assert!(!validate(quote!(bool)));
+        assert!(!validate(quote!(i8)));
+        assert!(!validate(quote!(i16)));
+        assert!(!validate(quote!(i32)));
+        assert!(!validate(quote!(i64)));
+        assert!(!validate(quote!(i128)));
+        assert!(!validate(quote!(isize)));
+        assert!(!validate(quote!(u8)));
+        assert!(!validate(quote!(u16)));
+        assert!(!validate(quote!(u32)));
+        assert!(!validate(quote!(u64)));
+        assert!(!validate(quote!(u128)));
+        assert!(!validate(quote!(usize)));
+        assert!(!validate(quote!(f32)));
+        assert!(!validate(quote!(f64)));
+        assert!(!validate(quote!(char)));
+        assert!(!validate(quote!(&str)));
+        assert!(!validate(quote!(String)));
+
+        assert!(!validate(quote!(())));
+        assert!(!validate(quote!((bool, bool))));
+        assert!(!validate(quote!((usize, usize, usize))));
+        assert!(!validate(quote!((usize, &str))));
+
+        assert!(!validate(quote!([isize])));
+        assert!(!validate(quote!([&str; 3])));
+        assert!(!validate(quote!(&[isize])));
+        assert!(!validate(quote!(&[&str; 3])));
+
+        assert!(!validate(quote!(Arc<&str>)));
+        assert!(!validate(quote!(BTreeSet<usize>)));
+        assert!(!validate(quote!(BTreeMap<usize, &str>)));
+        assert!(!validate(quote!(HashSet<&str>)));
+        assert!(!validate(quote!(HashMap<&str, &str>)));
+        assert!(!validate(quote!(LinkedList<char>)));
+        assert!(!validate(quote!(Option<char>)));
+        assert!(!validate(quote!(Option<Option<String>>)));
+        assert!(!validate(quote!(Rc<&str>)));
+        assert!(!validate(quote!(Vec<usize>)));
+        assert!(!validate(quote!(VecDeque<String>)));
+
+        assert!(!validate(quote!(impl Serialize)));
+        assert!(!validate(quote!(dyn Serialize)));
+    }
+}
diff --git a/packages/fortifier-macros/tests/derive/enum_named_pass.rs b/packages/fortifier-macros/tests/derive/enum_named_pass.rs
index 6946dfb..93fb43e 100644
--- a/packages/fortifier-macros/tests/derive/enum_named_pass.rs
+++ b/packages/fortifier-macros/tests/derive/enum_named_pass.rs
@@ -1,6 +1,4 @@
-use std::error::Error;
-
-use fortifier::Validate;
+use fortifier::{Validate, ValidationErrors};
 
 #[derive(Validate)]
 enum ChangeEmailAddressRelation {
@@ -19,7 +17,7 @@ enum ChangeEmailAddressRelation {
     },
 }
 
-fn main() -> Result<(), Box<dyn Error>> {
+fn main() -> Result<(), ValidationErrors<ChangeEmailAddressRelationValidationError>> {
     let data = ChangeEmailAddressRelation::Create {
         email_address: "john@doe.com".to_owned(),
     };
diff --git a/packages/fortifier-macros/tests/derive/enum_unit_pass.rs b/packages/fortifier-macros/tests/derive/enum_unit_pass.rs
index 20f19f7..da99c1e 100644
--- a/packages/fortifier-macros/tests/derive/enum_unit_pass.rs
+++ b/packages/fortifier-macros/tests/derive/enum_unit_pass.rs
@@ -1,6 +1,4 @@
-use std::error::Error;
-
-use fortifier::Validate;
+use fortifier::{Validate, ValidationErrors};
 
 #[derive(Validate)]
 enum ChangeEmailAddressRelation {
@@ -9,7 +7,7 @@ enum ChangeEmailAddressRelation {
     Delete,
 }
 
-fn main() -> Result<(), Box<dyn Error>> {
+fn main() -> Result<(), ValidationErrors<ChangeEmailAddressRelationValidationError>> {
     let data = ChangeEmailAddressRelation::Create;
 
     data.validate_sync()?;
diff --git a/packages/fortifier-macros/tests/derive/enum_unnamed_pass.rs b/packages/fortifier-macros/tests/derive/enum_unnamed_pass.rs
index c07374d..976a4c4 100644
--- a/packages/fortifier-macros/tests/derive/enum_unnamed_pass.rs
+++ b/packages/fortifier-macros/tests/derive/enum_unnamed_pass.rs
@@ -1,6 +1,4 @@
-use std::error::Error;
-
-use fortifier::Validate;
+use fortifier::{Validate, ValidationErrors};
 
 #[derive(Validate)]
 enum ChangeEmailAddressRelation {
@@ -9,7 +7,7 @@ enum ChangeEmailAddressRelation {
     Delete(String),
 }
 
-fn main() -> Result<(), Box<dyn Error>> {
+fn main() -> Result<(), ValidationErrors<ChangeEmailAddressRelationValidationError>> {
     let data = ChangeEmailAddressRelation::Create("john@doe.com".to_owned());
 
     data.validate_sync()?;
diff --git a/packages/fortifier-macros/tests/derive/struct_named_generics_pass.rs b/packages/fortifier-macros/tests/derive/struct_named_generics_pass.rs
index 2002eee..a5d3e25 100644
--- a/packages/fortifier-macros/tests/derive/struct_named_generics_pass.rs
+++ b/packages/fortifier-macros/tests/derive/struct_named_generics_pass.rs
@@ -1,6 +1,4 @@
-use std::error::Error;
-
-use fortifier::{Validate, ValidateEmail, ValidateLength};
+use fortifier::{Validate, ValidateEmail, ValidateLength, ValidationErrors};
 
 #[derive(Validate)]
 struct CreateUser<E: ValidateEmail, N: ValidateLength<usize>> {
@@ -11,7 +9,7 @@ struct CreateUser<E: ValidateEmail, N: ValidateLength<usize>> {
     name: N,
 }
 
-fn main() -> Result<(), Box<dyn Error>> {
+fn main() -> Result<(), ValidationErrors<CreateUserValidationError>> {
     let data = CreateUser {
         email: "john@doe.com",
         name: "John Doe",
diff --git a/packages/fortifier-macros/tests/derive/struct_named_lifetimes_pass.rs b/packages/fortifier-macros/tests/derive/struct_named_lifetimes_pass.rs
index 90f8d15..b0a452c 100644
--- a/packages/fortifier-macros/tests/derive/struct_named_lifetimes_pass.rs
+++ b/packages/fortifier-macros/tests/derive/struct_named_lifetimes_pass.rs
@@ -1,6 +1,4 @@
-use std::error::Error;
-
-use fortifier::Validate;
+use fortifier::{Validate, ValidationErrors};
 
 #[derive(Validate)]
 struct CreateUser<'a, 'b> {
@@ -11,7 +9,7 @@ struct CreateUser<'a, 'b> {
     name: &'b str,
 }
 
-fn main() -> Result<(), Box<dyn Error>> {
+fn main() -> Result<(), ValidationErrors<CreateUserValidationError>> {
     let data = CreateUser {
         email: "john@doe.com",
         name: "John Doe",
diff --git a/packages/fortifier-macros/tests/derive/struct_named_pass.rs b/packages/fortifier-macros/tests/derive/struct_named_pass.rs
index abe2f6d..621edcb 100644
--- a/packages/fortifier-macros/tests/derive/struct_named_pass.rs
+++ b/packages/fortifier-macros/tests/derive/struct_named_pass.rs
@@ -1,6 +1,4 @@
-use std::error::Error;
-
-use fortifier::Validate;
+use fortifier::{Validate, ValidationErrors};
 
 #[derive(Validate)]
 struct CreateUser {
@@ -11,7 +9,7 @@ struct CreateUser {
     name: String,
 }
 
-fn main() -> Result<(), Box<dyn Error>> {
+fn main() -> Result<(), ValidationErrors<CreateUserValidationError>> {
     let data = CreateUser {
         email: "john@doe.com".to_owned(),
         name: "John Doe".to_owned(),
diff --git a/packages/fortifier-macros/tests/derive/struct_unit_pass.rs b/packages/fortifier-macros/tests/derive/struct_unit_pass.rs
index 25200b3..7710ebf 100644
--- a/packages/fortifier-macros/tests/derive/struct_unit_pass.rs
+++ b/packages/fortifier-macros/tests/derive/struct_unit_pass.rs
@@ -1,11 +1,11 @@
-use std::error::Error;
+use std::convert::Infallible;
 
-use fortifier::Validate;
+use fortifier::{Validate, ValidationErrors};
 
 #[derive(Validate)]
 struct CreateUser;
 
-fn main() -> Result<(), Box<dyn Error>> {
+fn main() -> Result<(), ValidationErrors<Infallible>> {
     let data = CreateUser;
 
     data.validate_sync()?;
diff --git a/packages/fortifier-macros/tests/derive/struct_unnamed_generics_pass.rs b/packages/fortifier-macros/tests/derive/struct_unnamed_generics_pass.rs
index eee76c5..d5af8d0 100644
--- a/packages/fortifier-macros/tests/derive/struct_unnamed_generics_pass.rs
+++ b/packages/fortifier-macros/tests/derive/struct_unnamed_generics_pass.rs
@@ -1,11 +1,9 @@
-use std::error::Error;
-
-use fortifier::{Validate, ValidateLength};
+use fortifier::{Validate, ValidateLength, ValidationErrors};
 
 #[derive(Validate)]
 struct CreateUser<N: ValidateLength<usize>>(#[validate(length(min = 1, max = 256))] N);
 
-fn main() -> Result<(), Box<dyn Error>> {
+fn main() -> Result<(), ValidationErrors<CreateUserValidationError>> {
     let data = CreateUser("John Doe");
 
     data.validate_sync()?;
diff --git a/packages/fortifier-macros/tests/derive/struct_unnamed_lifetimes_pass.rs b/packages/fortifier-macros/tests/derive/struct_unnamed_lifetimes_pass.rs
index 250b0d6..7e6afac 100644
--- a/packages/fortifier-macros/tests/derive/struct_unnamed_lifetimes_pass.rs
+++ b/packages/fortifier-macros/tests/derive/struct_unnamed_lifetimes_pass.rs
@@ -1,11 +1,9 @@
-use std::error::Error;
-
-use fortifier::Validate;
+use fortifier::{Validate, ValidationErrors};
 
 #[derive(Validate)]
 struct CreateUser<'a>(#[validate(length(min = 1, max = 256))] &'a str);
 
-fn main() -> Result<(), Box<dyn Error>> {
+fn main() -> Result<(), ValidationErrors<CreateUserValidationError>> {
     let data = CreateUser("John Doe");
 
     data.validate_sync()?;
diff --git a/packages/fortifier-macros/tests/derive/struct_unnamed_pass.rs b/packages/fortifier-macros/tests/derive/struct_unnamed_pass.rs
index 7cc79c9..0a0e8ba 100644
--- a/packages/fortifier-macros/tests/derive/struct_unnamed_pass.rs
+++ b/packages/fortifier-macros/tests/derive/struct_unnamed_pass.rs
@@ -1,11 +1,9 @@
-use std::error::Error;
-
-use fortifier::Validate;
+use fortifier::{Validate, ValidationErrors};
 
 #[derive(Validate)]
 struct CreateUser(#[validate(length(min = 1, max = 256))] String);
 
-fn main() -> Result<(), Box<dyn Error>> {
+fn main() -> Result<(), ValidationErrors<CreateUserValidationError>> {
     let data = CreateUser("John Doe".to_owned());
 
     data.validate_sync()?;