diff --git a/Cargo.lock b/Cargo.lock
index b14319f..a6f8126 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -316,6 +316,12 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6245d59a3e82a7fc217c5828a6692dbc6dfb63a0c8c90495621f7b9d79704a0e"
 
+[[package]]
+name = "convert_case"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fb4a24b1aaf0fd0ce8b45161144d6f42cd91677fd5940fd431183eb023b3a2b8"
+
 [[package]]
 name = "core-foundation"
 version = "0.9.3"
@@ -359,7 +365,7 @@ version = "0.99.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4fb810d30a7c1953f91334de7244731fc3f3c10d7fe163338a35b9f640960321"
 dependencies = [
- "convert_case",
+ "convert_case 0.4.0",
  "proc-macro2",
  "quote",
  "rustc_version",
@@ -1330,6 +1336,7 @@ dependencies = [
 name = "proc_macros"
 version = "0.0.1"
 dependencies = [
+ "convert_case 0.5.0",
  "parse_duration",
  "quote",
  "syn",
diff --git a/proc_macros/Cargo.toml b/proc_macros/Cargo.toml
index f70487c..ae92068 100644
--- a/proc_macros/Cargo.toml
+++ b/proc_macros/Cargo.toml
@@ -11,6 +11,7 @@ path = "proc_macros.rs"
 proc-macro = true
 
 [dependencies]
+convert_case = "0.5"
 parse_duration = "2"
 quote = "1"
 syn = { version = "1", features = ["full"] }
diff --git a/proc_macros/proc_macros.rs b/proc_macros/proc_macros.rs
index 461236c..4e2a9e8 100644
--- a/proc_macros/proc_macros.rs
+++ b/proc_macros/proc_macros.rs
@@ -1,3 +1,5 @@
+use convert_case::Case;
+use convert_case::Casing;
 use proc_macro::TokenStream;
 use quote::quote;
 use syn::bracketed;
@@ -511,3 +513,70 @@ pub fn filter_http_methods(item: TokenStream) -> TokenStream {
     };
     stream.into()
 }
+
+struct CheckJsonKeys {
+    pub keys: Vec<(LitStr, bool)>,
+}
+
+impl Parse for CheckJsonKeys {
+    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+        let mut keys = Vec::new();
+        let first: LitStr = input.parse()?;
+        match input.parse::<token::Add>() {
+            Ok(_) => {
+                keys.push((first, true));
+            }
+            Err(_) => {
+                keys.push((first, false));
+            }
+        }
+        while !input.is_empty() {
+            let _: token::Comma = input.parse()?;
+            if input.is_empty() {
+                break;
+            }
+            let key: LitStr = input.parse()?;
+            match input.parse::<token::Add>() {
+                Ok(_) => {
+                    keys.push((key, true));
+                }
+                Err(_) => {
+                    keys.push((key, false));
+                }
+            }
+        }
+        Ok(Self { keys })
+    }
+}
+
+#[proc_macro]
+pub fn check_json_keys(item: TokenStream) -> TokenStream {
+    let CheckJsonKeys { keys } = parse_macro_input!(item as CheckJsonKeys);
+    let mut streams = Vec::new();
+    for (key, check) in keys {
+        if check {
+            let k = key.value();
+            let k = k.to_case(Case::Snake);
+            let fun = Ident::new(&k, key.span());
+            streams.push(quote!(#key => {
+                self.#fun().try_err(gettext("The value of the key <key> is missing.").replace("<key>", key))?;
+            }));
+        } else {
+            streams.push(quote!(#key => {}));
+        }
+    }
+    let stream = quote!(
+        {
+            use crate::ext::try_err::TryErr;
+            use crate::gettext;
+            self.data.is_object().try_err(gettext("Data is not a object."))?;
+            for (key, _) in self.data.entries() {
+                match key {
+                    #(#streams)*
+                    _ => { Err(format!("{} {}", gettext("Key <key> is handled:").replace("<key>", key).as_str(), self.data))?; }
+                }
+            }
+        }
+    );
+    stream.into()
+}
diff --git a/src/ext/try_err.rs b/src/ext/try_err.rs
index 118b46a..67519fe 100644
--- a/src/ext/try_err.rs
+++ b/src/ext/try_err.rs
@@ -36,3 +36,13 @@ impl<T, E, E2> TryErr<T, E> for Result<T, E2> {
         }
     }
 }
+
+impl<E> TryErr<(), E> for bool {
+    fn try_err(self, err: E) -> Result<(), E> {
+        if self {
+            Ok(())
+        } else {
+            Err(err)
+        }
+    }
+}
diff --git a/src/fanbox/article/block.rs b/src/fanbox/article/block.rs
new file mode 100644
index 0000000..2bb7173
--- /dev/null
+++ b/src/fanbox/article/block.rs
@@ -0,0 +1,122 @@
+use super::super::check::CheckUnkown;
+use json::JsonValue;
+use proc_macros::check_json_keys;
+use std::fmt::Debug;
+
+pub struct FanboxArticleParagraphBoldStyle {
+    pub data: JsonValue,
+}
+
+impl FanboxArticleParagraphBoldStyle {
+    #[inline]
+    pub fn length(&self) -> Option<u64> {
+        self.data["length"].as_u64()
+    }
+
+    #[inline]
+    /// Create a new instance
+    pub fn new(data: &JsonValue) -> Self {
+        Self { data: data.clone() }
+    }
+
+    #[inline]
+    pub fn offset(&self) -> Option<u64> {
+        self.data["offset"].as_u64()
+    }
+}
+
+impl CheckUnkown for FanboxArticleParagraphBoldStyle {
+    fn check_unknown(&self) -> Result<(), crate::fanbox::error::FanboxAPIError> {
+        check_json_keys!("offset"+, "length"+,);
+        Ok(())
+    }
+}
+
+impl Debug for FanboxArticleParagraphBoldStyle {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("FanboxArticleParagraphBoldStyle")
+            .field("length", &self.length())
+            .field("offset", &self.offset())
+            .finish_non_exhaustive()
+    }
+}
+
+#[derive(Debug)]
+pub enum FanboxArticleParagraphStyle {
+    Bold(FanboxArticleParagraphBoldStyle),
+    Unknown(JsonValue),
+}
+
+impl FanboxArticleParagraphStyle {
+    #[inline]
+    /// Create a new instance
+    pub fn new(data: &JsonValue) -> Self {
+        match data["type"].as_str() {
+            Some(t) => match t {
+                "bold" => Self::Bold(FanboxArticleParagraphBoldStyle::new(data)),
+                _ => Self::Unknown(data.clone()),
+            },
+            None => Self::Unknown(data.clone()),
+        }
+    }
+}
+
+pub struct FanboxArticleParagraphBlock {
+    pub data: JsonValue,
+}
+
+impl FanboxArticleParagraphBlock {
+    #[inline]
+    /// Create a new instance
+    pub fn new(data: &JsonValue) -> Self {
+        Self { data: data.clone() }
+    }
+
+    #[inline]
+    pub fn styles(&self) -> Option<Vec<FanboxArticleParagraphStyle>> {
+        let styles = &self.data["styles"];
+        if styles.is_array() {
+            let mut list = Vec::new();
+            for i in styles.members() {
+                list.push(FanboxArticleParagraphStyle::new(i))
+            }
+            Some(list)
+        } else {
+            None
+        }
+    }
+
+    #[inline]
+    pub fn text(&self) -> Option<&str> {
+        self.data["text"].as_str()
+    }
+}
+
+impl Debug for FanboxArticleParagraphBlock {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("FanboxArticleParagraphBlock")
+            .field("styles", &self.styles())
+            .field("text", &self.text())
+            .finish_non_exhaustive()
+    }
+}
+
+#[derive(Debug)]
+pub enum FanboxArticleBlock {
+    Paragraph(FanboxArticleParagraphBlock),
+    Unknown(JsonValue),
+}
+
+impl FanboxArticleBlock {
+    #[inline]
+    /// Create a new instance
+    pub fn new(data: &JsonValue) -> Self {
+        match data["type"].as_str() {
+            Some(t) => match t {
+                "p" => Self::Paragraph(FanboxArticleParagraphBlock::new(data)),
+                _ => Self::Unknown(data.clone()),
+            },
+            None => Self::Unknown(data.clone()),
+        }
+    }
+}
diff --git a/src/fanbox/article/body.rs b/src/fanbox/article/body.rs
new file mode 100644
index 0000000..4306ec9
--- /dev/null
+++ b/src/fanbox/article/body.rs
@@ -0,0 +1,45 @@
+use super::block::FanboxArticleBlock;
+use crate::fanbox_api::FanboxClientInternal;
+use json::JsonValue;
+use std::fmt::Debug;
+use std::sync::Arc;
+
+/// Article body
+pub struct FanboxArticleBody {
+    /// Raw data
+    pub data: JsonValue,
+    client: Arc<FanboxClientInternal>,
+}
+
+impl FanboxArticleBody {
+    #[inline]
+    pub fn blocks(&self) -> Option<Vec<FanboxArticleBlock>> {
+        let blocks = &self.data["blocks"];
+        if blocks.is_array() {
+            let mut list = Vec::new();
+            for i in blocks.members() {
+                list.push(FanboxArticleBlock::new(i))
+            }
+            Some(list)
+        } else {
+            None
+        }
+    }
+
+    #[inline]
+    /// Create a new instance
+    pub fn new(data: &JsonValue, client: Arc<FanboxClientInternal>) -> Self {
+        Self {
+            data: data.clone(),
+            client,
+        }
+    }
+}
+
+impl Debug for FanboxArticleBody {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("FanboxArticleBody")
+            .field("blocks", &self.blocks())
+            .finish_non_exhaustive()
+    }
+}
diff --git a/src/fanbox/article/mod.rs b/src/fanbox/article/mod.rs
new file mode 100644
index 0000000..17590e6
--- /dev/null
+++ b/src/fanbox/article/mod.rs
@@ -0,0 +1,2 @@
+pub mod block;
+pub mod body;
diff --git a/src/fanbox/check.rs b/src/fanbox/check.rs
new file mode 100644
index 0000000..b519dec
--- /dev/null
+++ b/src/fanbox/check.rs
@@ -0,0 +1,6 @@
+use super::error::FanboxAPIError;
+
+/// Check if have data that we don't handle
+pub trait CheckUnkown {
+    fn check_unknown(&self) -> Result<(), FanboxAPIError>;
+}
diff --git a/src/fanbox/mod.rs b/src/fanbox/mod.rs
index 538c406..556ff09 100644
--- a/src/fanbox/mod.rs
+++ b/src/fanbox/mod.rs
@@ -1,3 +1,5 @@
+pub mod article;
+pub mod check;
 pub mod comment;
 pub mod comment_list;
 pub mod creator;
diff --git a/src/fanbox/post.rs b/src/fanbox/post.rs
index 499b140..b218e0c 100644
--- a/src/fanbox/post.rs
+++ b/src/fanbox/post.rs
@@ -1,3 +1,4 @@
+use super::article::body::FanboxArticleBody;
 use super::comment_list::FanboxCommentList;
 use crate::fanbox_api::FanboxClientInternal;
 use crate::parser::json::parse_u64;
@@ -16,6 +17,11 @@ pub struct FanboxPostArticle {
 }
 
 impl FanboxPostArticle {
+    #[inline]
+    pub fn body(&self) -> FanboxArticleBody {
+        FanboxArticleBody::new(&self.data["body"], Arc::clone(&self.client))
+    }
+
     #[inline]
     pub fn comment_count(&self) -> Option<u64> {
         self.data["commentCount"].as_u64()
@@ -161,6 +167,7 @@ impl Debug for FanboxPostArticle {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         f.debug_struct("FanboxPostArticle")
             .field("id", &self.id())
+            .field("body", &self.body())
             .field("comment_count", &self.comment_count())
             .field("comment_list", &self.comment_list())
             .field("cover_image_url", &self.cover_image_url())