diff --git a/Cargo.toml b/Cargo.toml
index 4d5babb..a2005be 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "http"
-version = "0.1.1"
+version = "0.1.2"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
diff --git a/src/lib.rs b/src/lib.rs
index 7febb3a..049852b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -8,11 +8,17 @@
 //! * HTTP Headers not parsed
 
 mod body;
+mod message;
 mod request;
+mod response;
 mod start_line;
+mod status;
 mod version;
 
 pub use body::HTTPBody;
+pub use message::JSONMessage;
 pub use request::HTTPRequest;
+pub use response::HTTPResponse;
 pub use start_line::HTTPStartLine;
+pub use status::{HTTPStatusCode, HTTPStatusLine};
 pub use version::HTTPVersion;
diff --git a/src/message.rs b/src/message.rs
new file mode 100644
index 0000000..bd5edda
--- /dev/null
+++ b/src/message.rs
@@ -0,0 +1,94 @@
+use json::JsonValue;
+use std::collections::HashMap;
+
+const JSON_DELIMITER: &'static str = ",";
+
+/// JSONMessage aims to build a JSON object from an `HashMap`
+pub struct JSONMessage {
+    message: HashMap<String, String>,
+}
+
+impl Default for JSONMessage {
+    fn default() -> Self {
+        JSONMessage {
+            message: HashMap::new(),
+        }
+    }
+}
+
+/// try to convert `JSONMessage` into `json::JsonValue`
+impl TryInto<JsonValue> for JSONMessage {
+    type Error = String;
+    fn try_into(self) -> Result<JsonValue, Self::Error> {
+        let message = format!(r#"{{{}}}"#, self.build_json());
+        match json::parse(&message) {
+            Ok(r) => Ok(r),
+            Err(e) => Err(format!(
+                "unable to parse the HTTPMessage correctly: {}, err={}",
+                message, e
+            )),
+        }
+    }
+}
+
+impl JSONMessage {
+    pub fn put(&mut self, key: &str, value: &str) {
+        self.message.insert(key.to_string(), value.to_string());
+    }
+
+    /// associated function to build an HTTPMessage error
+    pub fn error(message: &str) -> Option<JsonValue> {
+        let mut http_message = JSONMessage::default();
+        http_message.put("error", message);
+
+        match message.try_into() {
+            Ok(m) => Some(m),
+            Err(e) => {
+                log::error!(
+                    "unable to parse the message: {} into JSON, err={}",
+                    message,
+                    e
+                );
+                return None;
+            }
+        }
+    }
+
+    /// loops over all the HashMap keys, builds a JSON key value for each one and join them with `JSON_DELIMITER`
+    fn build_json(self) -> String {
+        let unstruct: Vec<String> = self
+            .message
+            .keys()
+            .map(|k| format!(r#""{}":{:?}"#, k, self.message.get(k).unwrap()))
+            .collect();
+        let joined = unstruct.join(JSON_DELIMITER);
+        joined
+    }
+}
+
+#[test]
+fn test_message() {
+    let mut message = JSONMessage::default();
+    message.put("email", "toto@toto.fr");
+    message.put("password", "tata");
+
+    let mut json_result: Result<JsonValue, String> = message.try_into();
+    assert!(json_result.is_ok());
+
+    let mut json = json_result.unwrap();
+    assert!(json.has_key("email"));
+    assert!(json.has_key("password"));
+
+    let empty_message = JSONMessage::default();
+    json_result = empty_message.try_into();
+    assert!(json_result.is_ok());
+
+    json = json_result.unwrap();
+    assert_eq!("{}", json.dump().to_string());
+
+    let mut bad_message = JSONMessage::default();
+    bad_message.put("\"", "");
+
+    json_result = bad_message.try_into();
+    assert!(json_result.is_err());
+}
diff --git a/src/response.rs b/src/response.rs
new file mode 100644
index 0000000..6f40dbf
--- /dev/null
+++ b/src/response.rs
@@ -0,0 +1,112 @@
+use json::JsonValue;
+
+use crate::{HTTPStatusCode, HTTPStatusLine};
+
+const UNEXPECTED_ERROR: &'static str = r#"{"error":"unexpected error occurred"}"#;
+const NOT_FOUND_ERROR: &'static str = r#"{"error":"url not found"}"#;
+const FORBIDDEN_ERROR: &'static str = r#"{"error":"url forbidden"}"#;
+const BAD_REQUEST_ERROR: &'static str = r#"{"error":"bad request"}"#;
+
+const STATUS_OK: &'static str = r#"{"status":"ok"}"#;
+
+/// HTTPResponse represents an HTTP response (headers are not parsed)
+/// NOTE: for simplicity, only JSON body are allowed
+pub struct HTTPResponse {
+    status_line: HTTPStatusLine,
+    body: JsonValue,
+}
+
+impl Into<String> for HTTPResponse {
+    fn into(self) -> String {
+        let body: String = json::stringify(self.body.clone());
+        let status_line: String = self.status_line.into();
+        format!(
+            "{}\r\nContent-Type: application/json\r\nContent-Length:{}\r\n\r\n{}",
+            status_line,
+            body.len(),
+            body
+        )
+    }
+}
+
+impl Default for HTTPResponse {
+    fn default() -> Self {
+        HTTPResponse {
+            status_line: HTTPStatusLine::default(),
+            body: json::parse(r#"{}"#).unwrap(),
+        }
+    }
+}
+
+impl HTTPResponse {
+    pub fn as_500(message: Option<json::JsonValue>) -> Self {
+        let mut response = Self::default();
+
+        response
+            .status_line
+            .set_status_code(HTTPStatusCode::Http500);
+
+        response.body = {
+            match message {
+                Some(m) => m,
+                None => json::parse(UNEXPECTED_ERROR).unwrap(),
+            }
+        };
+
+        response
+    }
+
+    pub fn as_404() -> Self {
+        let mut response = Self::default();
+
+        response
+            .status_line
+            .set_status_code(HTTPStatusCode::Http404);
+        response.body = json::parse(NOT_FOUND_ERROR).unwrap();
+
+        response
+    }
+
+    pub fn as_403() -> Self {
+        let mut response = HTTPResponse {
+            status_line: HTTPStatusLine::default(),
+            body: json::parse(FORBIDDEN_ERROR).unwrap(),
+        };
+
+        response
+            .status_line
+            .set_status_code(HTTPStatusCode::Http403);
+
+        response
+    }
+
+    pub fn as_400() -> Self {
+        let mut response = HTTPResponse {
+            status_line: HTTPStatusLine::default(),
+            body: json::parse(BAD_REQUEST_ERROR).unwrap(),
+        };
+
+        response
+            .status_line
+            .set_status_code(HTTPStatusCode::Http400);
+
+        response
+    }
+
+    pub fn as_200(message: Option<json::JsonValue>) -> Self {
+        let mut response = Self::default();
+
+        response
+            .status_line
+            .set_status_code(HTTPStatusCode::Http200);
+
+        response.body = {
+            match message {
+                Some(m) => m,
+                None => json::parse(STATUS_OK).unwrap(),
+            }
+        };
+
+        response
+    }
+}
diff --git a/src/status.rs b/src/status.rs
new file mode 100644
index 0000000..776eded
--- /dev/null
+++ b/src/status.rs
@@ -0,0 +1,50 @@
+use crate::HTTPVersion;
+
+#[derive(Debug, PartialEq)]
+pub enum HTTPStatusCode {
+    Http200,
+    Http400,
+    Http403,
+    Http404,
+    Http500,
+}
+
+impl Into<String> for HTTPStatusCode {
+    fn into(self) -> String {
+        match self {
+            Self::Http200 => "200".to_string(),
+            Self::Http400 => "400".to_string(),
+            Self::Http404 => "404".to_string(),
+            Self::Http403 => "403".to_string(),
+            Self::Http500 => "500".to_string(),
+        }
+    }
+}
+
+pub struct HTTPStatusLine {
+    version: HTTPVersion,
+    status_code: HTTPStatusCode,
+}
+
+impl Default for HTTPStatusLine {
+    fn default() -> HTTPStatusLine {
+        HTTPStatusLine {
+            version: HTTPVersion::Http1_1,
+            status_code: HTTPStatusCode::Http400,
+        }
+    }
+}
+
+impl Into<String> for HTTPStatusLine {
+    fn into(self) -> String {
+        let version: String = self.version.into();
+        let status_code: String = self.status_code.into();
+        format! {"{} {}", version, status_code}
+    }
+}
+
+impl HTTPStatusLine {
+    pub fn set_status_code(&mut self, code: HTTPStatusCode) {
+        self.status_code = code;
+    }
+}