diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a0619ea..c5e9717 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -42,6 +42,12 @@ jobs:
           command: test
           args: --features arbitrary
 
+      - name: cargo test --all-features
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --all-features
+
   rustfmt:
     name: Rustfmt
     runs-on: ubuntu-latest
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6a7782d..9ed8a98 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+### Next
+* Add `serde` feature (`Serialize` and `Deserialize` for `Lang` and `Script`).
+
 ### v0.16.2 - 2022-10-23
 * Support [Arbitrary](https://crates.io/crates/arbitrary)
 
diff --git a/Cargo.toml b/Cargo.toml
index d63b3d1..ce1d60f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,6 +22,7 @@ include = [
 hashbrown = "0.12.0"
 once_cell = "1.10.0"
 enum-map = { version = "2", optional = true }
+serde = { version = "1", optional = true, features = ["derive"] }
 arbitrary = { version = "1", optional = true, features = ["derive"] }
 
 [dev-dependencies]
diff --git a/README.md b/README.md
index 40f7fc1..5a2c3b3 100644
--- a/README.md
+++ b/README.md
@@ -72,7 +72,8 @@ You're gonna be in a great company using Whatlang:
 | Feature     | Description                                                                           |
 |-------------|---------------------------------------------------------------------------------------|
 | `enum-map`  | `Lang` and `Script` implement `Enum` trait from [enum-map](https://docs.rs/enum-map/) |
-| `arbitrary` | Support [Arbitrary](https://crates.io/crates/arbitrary) |
+| `arbitrary` | Support [Arbitrary](https://crates.io/crates/arbitrary)                               |
+| `serde`     | Implements `Serialize` and `Deserialize` for `Lang` and `Script`                      |
 | `dev`       | Enables `whatlang::dev` module which provides some internal API.<br/> It exists for profiling purposes and normal users are discouraged to to rely on this API.  |
 
 ## How does it work?
diff --git a/src/core/filter_list.rs b/src/core/filter_list.rs
index 3e12341..eed86d4 100644
--- a/src/core/filter_list.rs
+++ b/src/core/filter_list.rs
@@ -1,8 +1,9 @@
 use crate::Lang;
 
 #[cfg_attr(feature = "arbitrary", derive(::arbitrary::Arbitrary))]
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Default)]
 pub enum FilterList {
+    #[default]
     All,
     Allow(Vec<Lang>),
     Deny(Vec<Lang>),
@@ -18,25 +19,19 @@ impl FilterList {
         Self::Allow(allowlist)
     }
 
-    pub fn deny(blacklist: Vec<Lang>) -> Self {
-        Self::Deny(blacklist)
+    pub fn deny(denylist: Vec<Lang>) -> Self {
+        Self::Deny(denylist)
     }
 
     pub fn is_allowed(&self, lang: Lang) -> bool {
         match self {
             Self::All => true,
             Self::Allow(ref allowlist) => allowlist.contains(&lang),
-            Self::Deny(ref blacklist) => !blacklist.contains(&lang),
+            Self::Deny(ref denylist) => !denylist.contains(&lang),
         }
     }
 }
 
-impl Default for FilterList {
-    fn default() -> Self {
-        FilterList::All
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/src/core/method.rs b/src/core/method.rs
index 76ec97c..8c40266 100644
--- a/src/core/method.rs
+++ b/src/core/method.rs
@@ -3,10 +3,11 @@ use std::fmt;
 use std::str::FromStr;
 
 #[cfg_attr(feature = "arbitrary", derive(::arbitrary::Arbitrary))]
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
 pub enum Method {
     Trigram,
     Alphabet,
+    #[default]
     Combined,
 }
 
@@ -34,12 +35,6 @@ impl fmt::Display for Method {
     }
 }
 
-impl Default for Method {
-    fn default() -> Self {
-        Method::Combined
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/src/lang.rs b/src/lang.rs
index b0e034b..ba84ff3 100644
--- a/src/lang.rs
+++ b/src/lang.rs
@@ -10,6 +10,11 @@ use crate::error::ParseError;
 /// Represents a language following [ISO 639-3](https://en.wikipedia.org/wiki/ISO_639-3) standard.
 #[cfg_attr(feature = "enum-map", derive(::enum_map::Enum))]
 #[cfg_attr(feature = "arbitrary", derive(::arbitrary::Arbitrary))]
+#[cfg_attr(
+    feature = "serde",
+    derive(::serde::Serialize, ::serde::Deserialize),
+    serde(rename_all = "lowercase")
+)]
 #[derive(PartialEq, Eq, Debug, Hash, Clone, Copy)]
 pub enum Lang {
     /// Esperanto (Esperanto)
@@ -721,4 +726,14 @@ mod tests {
         assert_eq!(Lang::Deu.to_string(), "Deutsch");
         assert_eq!(Lang::Eng.to_string(), "English");
     }
+
+    #[cfg(feature = "serde")]
+    #[test]
+    fn test_serialize_and_deserialize() {
+        let langs = vec![Lang::Epo, Lang::Ukr, Lang::Spa];
+        let json_langs = serde_json::to_string(&langs).unwrap();
+        assert_eq!(json_langs, r#"["epo","ukr","spa"]"#);
+        let parsed_langs: Vec<Lang> = serde_json::from_str(&json_langs).unwrap();
+        assert_eq!(parsed_langs, langs);
+    }
 }
diff --git a/src/lib.rs b/src/lib.rs
index f95c27d..e48f39a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -34,10 +34,12 @@
 //!
 //! # Features
 //!
-//! | Feature    | Description                                                                           |
-//! |------------|---------------------------------------------------------------------------------------|
-//! | `enum-map` | `Lang` and `Script` implement `Enum` trait from [enum-map](https://docs.rs/enum-map/) |
-//!
+//! | Feature     | Description                                                                           |
+//! |-------------|---------------------------------------------------------------------------------------|
+//! | `enum-map`  | `Lang` and `Script` implement `Enum` trait from [enum-map](https://docs.rs/enum-map/) |
+//! | `arbitrary` | Support [Arbitrary](https://crates.io/crates/arbitrary)                               |
+//! | `serde`     | Implements `Serialize` and `Deserialize` for `Lang` and `Script`                      |
+//! | `dev`       | Enables `whatlang::dev` module which provides some internal API.<br/> It exists for profiling purposes and normal users are discouraged to to rely on this API.  |
 //!
 mod alphabets;
 mod combined;
diff --git a/src/scripts/script.rs b/src/scripts/script.rs
index be839cd..cd0e8ef 100644
--- a/src/scripts/script.rs
+++ b/src/scripts/script.rs
@@ -8,6 +8,7 @@ use crate::Lang;
 /// Represents a writing system (Latin, Cyrillic, Arabic, etc).
 #[cfg_attr(feature = "enum-map", derive(::enum_map::Enum))]
 #[cfg_attr(feature = "arbitrary", derive(::arbitrary::Arbitrary))]
+#[cfg_attr(feature = "serde", derive(::serde::Serialize, ::serde::Deserialize))]
 #[derive(PartialEq, Eq, Debug, Clone, Copy, Hash)]
 pub enum Script {
     // Keep this in alphabetic order (for C bindings)
@@ -205,4 +206,14 @@ mod tests {
         assert_eq!(Script::Cyrillic.to_string(), "Cyrillic");
         assert_eq!(Script::Arabic.to_string(), "Arabic");
     }
+
+    #[cfg(feature = "serde")]
+    #[test]
+    fn test_serialize_and_deserialize() {
+        let scripts = vec![Script::Georgian, Script::Cyrillic];
+        let json_scripts = serde_json::to_string(&scripts).unwrap();
+        assert_eq!(json_scripts, r#"["Georgian","Cyrillic"]"#);
+        let parsed_scripts: Vec<Script> = serde_json::from_str(&json_scripts).unwrap();
+        assert_eq!(parsed_scripts, scripts);
+    }
 }