diff --git a/Cargo.toml b/Cargo.toml
index 8cdf611..7cae392 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,9 +1,14 @@
 [package]
 name = "simdjson-rust"
-version = "0.3.0"
+version = "0.3.0-alpha"
 authors = ["SunDoge <384813529@qq.com>"]
 edition = "2021"
 license = "Apache-2.0"
+description = "Rust bindings for the simdjson project."
+homepage = "https://crates.io/crates/simdjson-rust"
+documentation = "https://docs.rs/simdjson-rust"
+repository = "https://github.com/SunDoge/simdjson-rust"
+readme = "README.md"
 exclude = [".github/", "examples/"]
 
 
diff --git a/README.md b/README.md
index 316a077..58e4c03 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,14 @@
 
 This crate currently uses `simdjson 3.2.3`. You can have a try and give feedback.
 
+If you
+
+- find certain APIs are missing
+- encounter memory errors
+- experience performance degradation
+
+Please submit an issue.
+
 ## Usage
 
 Add this to your `Cargo.toml`
@@ -16,9 +24,9 @@ simdjson-rust = {git = "https://github.com/SunDoge/simdjson-rust"}
 Then, get started.
 
 ```rust
-use simdjson_rust::{error::Result, ondemand::parser::Parser, padded_string::make_padded_string};
+use simdjson_rust::{ondemand::Parser, prelude::*};
 
-fn main() -> Result<()> {
+fn main() -> simdjson_rust::Result<()> {
     let mut parser = Parser::default();
     let ps = make_padded_string("[0,1,2,3]");
     let mut doc = parser.iterate(&ps)?;
diff --git a/examples/simple.rs b/examples/simple.rs
index 138d270..6c6a4e5 100644
--- a/examples/simple.rs
+++ b/examples/simple.rs
@@ -1,7 +1,7 @@
-use simdjson_rust::{ondemand::Parser, prelude::*};
+use simdjson_rust::prelude::*;
 
 fn main() -> simdjson_rust::Result<()> {
-    let mut parser = Parser::default();
+    let mut parser = ondemand::Parser::default();
     let ps = make_padded_string("[0,1,2,3]");
     let mut doc = parser.iterate(&ps)?;
     let mut array = doc.get_array()?;
diff --git a/simdjson-sys/src/simdjson_c_api.cpp b/simdjson-sys/src/simdjson_c_api.cpp
index 07cfecf..f2aabed 100644
--- a/simdjson-sys/src/simdjson_c_api.cpp
+++ b/simdjson-sys/src/simdjson_c_api.cpp
@@ -12,6 +12,15 @@ template <typename U, typename T> inline U object_to_pointer(T &&t) {
   return reinterpret_cast<U>(new T(std::move(t)));
 }
 
+// template <typename T>
+// inline int enum_result_to_number_result(simdjson_result<T>&& enum_result) {
+//   T inner;
+//   auto error = std::move(enum_result).get(inner);
+//   if (error == error_code::SUCCESS) {
+
+//   }
+// }
+
 } // namespace
 
 #define IMPL_CLASS(name, type)                                                 \
@@ -41,10 +50,9 @@ template <typename U, typename T> inline U object_to_pointer(T &&t) {
   }
 
 #define IMPL_AT_POINTER(self, type)                                            \
-  SJ_OD_value_result *self##_at_pointer(self *self, const char *s,             \
-                                        size_t len) {                          \
+  SJ_OD_value_result *self##_at_pointer(self *r, const char *s, size_t len) {  \
     auto result =                                                              \
-        reinterpret_cast<type *>(self)->at_pointer(std::string_view(s, len));  \
+        reinterpret_cast<type *>(r)->at_pointer(std::string_view(s, len));     \
     return object_to_pointer<SJ_OD_value_result *>(std::move(result));         \
   }
 
@@ -69,12 +77,15 @@ IMPL_CLASS(SJ_OD_object_iterator, ondemand::object_iterator)
 IMPL_RESULT(SJ_OD_object_iterator, ondemand::object_iterator)
 IMPL_CLASS(SJ_OD_field, ondemand::field)
 IMPL_RESULT(SJ_OD_field, ondemand::field)
+IMPL_CLASS(SJ_OD_number, ondemand::number)
+IMPL_RESULT(SJ_OD_number, ondemand::number)
 
 IMPL_PRIMITIVE_RESULT(uint64_t)
 IMPL_PRIMITIVE_RESULT(int64_t)
 IMPL_PRIMITIVE_RESULT(double)
 IMPL_PRIMITIVE_RESULT(bool)
 IMPL_PRIMITIVE_RESULT(size_t)
+IMPL_PRIMITIVE_RESULT(int)
 
 // SJ_padded_string *SJ_padded_string_new(const char *s, size_t len) {
 //   return object_to_pointer<SJ_padded_string *>(padded_string(s, len));
@@ -134,6 +145,9 @@ IMPL_GET(SJ_OD_value, ondemand::value, double, get_double)
 IMPL_GET(SJ_OD_value, ondemand::value, SJ_OD_raw_json_string,
          get_raw_json_string)
 IMPL_GET(SJ_OD_value, ondemand::value, STD_string_view, get_wobbly_string)
+IMPL_GET(SJ_OD_value, ondemand::value, bool, is_null)
+IMPL_GET(SJ_OD_value, ondemand::value, int, type)
+IMPL_GET(SJ_OD_value, ondemand::value, SJ_OD_number, get_number)
 IMPL_AT_POINTER(SJ_OD_value, ondemand::value)
 
 // ondemand::document
@@ -145,6 +159,9 @@ IMPL_GET(SJ_OD_document, ondemand::document, double, get_double)
 IMPL_GET(SJ_OD_document, ondemand::document, SJ_OD_raw_json_string,
          get_raw_json_string)
 IMPL_GET(SJ_OD_document, ondemand::document, STD_string_view, get_wobbly_string)
+IMPL_GET(SJ_OD_document, ondemand::document, bool, is_null)
+IMPL_GET(SJ_OD_document, ondemand::document, int, type)
+IMPL_GET(SJ_OD_document, ondemand::document, SJ_OD_number, get_number)
 IMPL_AT_POINTER(SJ_OD_document, ondemand::document)
 
 STD_string_view_result *SJ_OD_value_get_string(SJ_OD_value *self,
@@ -252,3 +269,18 @@ SJ_OD_value *SJ_OD_field_take_value(SJ_OD_field *self) {
   auto value = std::move(*field).value();
   return object_to_pointer<SJ_OD_value *>(std::move(value));
 }
+
+// ondemand::number
+#define IMPL_GET_PRIMITIVE(self, real_name, value, method)                     \
+  value self##_##method(self *r) {                                             \
+    return reinterpret_cast<real_name *>(r)->method();                         \
+  }
+
+IMPL_GET_PRIMITIVE(SJ_OD_number, ondemand::number, uint64_t, get_uint64)
+IMPL_GET_PRIMITIVE(SJ_OD_number, ondemand::number, int64_t, get_int64)
+IMPL_GET_PRIMITIVE(SJ_OD_number, ondemand::number, double, get_double)
+
+int SJ_OD_number_get_number_type(SJ_OD_number *self) {
+  return static_cast<int>(
+      reinterpret_cast<ondemand::number *>(self)->get_number_type());
+}
\ No newline at end of file
diff --git a/simdjson-sys/src/simdjson_c_api.h b/simdjson-sys/src/simdjson_c_api.h
index c87b9c2..4110a5b 100644
--- a/simdjson-sys/src/simdjson_c_api.h
+++ b/simdjson-sys/src/simdjson_c_api.h
@@ -24,7 +24,10 @@
   value##_result *self##_##method(self *r);
 
 #define DEFINE_AT_POINTER(self)                                                \
-  SJ_OD_value_result *self##_at_pointer(self *self, const char *s, size_t len);
+  SJ_OD_value_result *self##_at_pointer(self *r, const char *s, size_t len);
+
+#define DEFINE_GET_PRIMITIVE(self, value, method)                              \
+  value self##_##method(self *r);
 
 #ifdef __cplusplus
 extern "C" {
@@ -52,19 +55,22 @@ DEFINE_CLASS(SJ_OD_object_iterator)
 DEFINE_RESULT(SJ_OD_object_iterator)
 DEFINE_CLASS(SJ_OD_field)
 DEFINE_RESULT(SJ_OD_field)
+DEFINE_CLASS(SJ_OD_number)
+DEFINE_RESULT(SJ_OD_number)
 
 DEFINE_PRIMITIVE_RESULT(uint64_t)
 DEFINE_PRIMITIVE_RESULT(int64_t)
 DEFINE_PRIMITIVE_RESULT(double)
 DEFINE_PRIMITIVE_RESULT(bool)
 DEFINE_PRIMITIVE_RESULT(size_t)
+DEFINE_PRIMITIVE_RESULT(int)
 
 // padded_string
-SJ_padded_string *SJ_padded_string_new(const char *s, size_t len);
-SJ_padded_string_result *
-SJ_padded_string_load(const char *path); // null terminated string.
-size_t SJ_padded_string_length(const SJ_padded_string *ps);
-const uint8_t *SJ_padded_string_u8data(const SJ_padded_string *ps);
+// SJ_padded_string *SJ_padded_string_new(const char *s, size_t len);
+// SJ_padded_string_result *
+// SJ_padded_string_load(const char *path); // null terminated string.
+// size_t SJ_padded_string_length(const SJ_padded_string *ps);
+// const uint8_t *SJ_padded_string_u8data(const SJ_padded_string *ps);
 
 // ondemand::parser
 SJ_OD_parser *SJ_OD_parser_new(size_t max_capacity);
@@ -84,6 +90,9 @@ DEFINE_GET(SJ_OD_value, SJ_OD_array, get_array)
 DEFINE_GET(SJ_OD_value, SJ_OD_object, get_object)
 DEFINE_GET(SJ_OD_value, SJ_OD_raw_json_string, get_raw_json_string)
 DEFINE_GET(SJ_OD_value, STD_string_view, get_wobbly_string)
+DEFINE_GET(SJ_OD_value, bool, is_null)
+DEFINE_GET(SJ_OD_value, int, type)
+DEFINE_GET(SJ_OD_value, SJ_OD_number, get_number)
 DEFINE_AT_POINTER(SJ_OD_value)
 
 // ondemand::document
@@ -96,6 +105,9 @@ DEFINE_GET(SJ_OD_document, SJ_OD_array, get_array)
 DEFINE_GET(SJ_OD_document, SJ_OD_object, get_object)
 DEFINE_GET(SJ_OD_document, SJ_OD_raw_json_string, get_raw_json_string)
 DEFINE_GET(SJ_OD_document, STD_string_view, get_wobbly_string)
+DEFINE_GET(SJ_OD_document, bool, is_null)
+DEFINE_GET(SJ_OD_document, int, type)
+DEFINE_GET(SJ_OD_document, SJ_OD_number, get_number)
 DEFINE_AT_POINTER(SJ_OD_document)
 
 // get_string is special.
@@ -151,6 +163,12 @@ STD_string_view_result *SJ_OD_field_unescaped_key(SJ_OD_field *self,
 SJ_OD_value *SJ_OD_field_value(SJ_OD_field *self);
 SJ_OD_value *SJ_OD_field_take_value(SJ_OD_field *self);
 
+// ondemand::number
+DEFINE_GET_PRIMITIVE(SJ_OD_number, int, get_number_type)
+DEFINE_GET_PRIMITIVE(SJ_OD_number, uint64_t, get_uint64)
+DEFINE_GET_PRIMITIVE(SJ_OD_number, int64_t, get_int64)
+DEFINE_GET_PRIMITIVE(SJ_OD_number, double, get_double)
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/ondemand/document.rs b/src/ondemand/document.rs
index 22f6d00..5f4562c 100644
--- a/src/ondemand/document.rs
+++ b/src/ondemand/document.rs
@@ -2,7 +2,7 @@ use std::{marker::PhantomData, ptr::NonNull};
 
 use simdjson_sys as ffi;
 
-use super::{array::Array, object::Object, parser::Parser, value::Value};
+use super::{array::Array, number::Number, object::Object, parser::Parser, value::Value, JsonType};
 use crate::{
     error::Result,
     macros::{impl_drop, map_result},
@@ -116,6 +116,34 @@ impl<'p, 's> Document<'p, 's> {
         )
         .map(Value::new)
     }
+
+    pub fn get_number<'a>(&mut self) -> Result<Number<'a>> {
+        map_result!(
+            ffi::SJ_OD_document_get_number(self.ptr.as_mut()),
+            ffi::SJ_OD_number_result_error,
+            ffi::SJ_OD_number_result_value_unsafe
+        )
+        .map(Number::new)
+    }
+
+    pub fn is_null(&mut self) -> Result<bool> {
+        map_result!(
+            primitive,
+            ffi::SJ_OD_document_is_null(self.ptr.as_mut()),
+            ffi::bool_result_error,
+            ffi::bool_result_value_unsafe
+        )
+    }
+
+    pub fn json_type(&mut self) -> Result<JsonType> {
+        let json_type = map_result!(
+            primitive,
+            ffi::SJ_OD_document_type(self.ptr.as_mut()),
+            ffi::int_result_error,
+            ffi::int_result_value_unsafe
+        )?;
+        Ok(JsonType::from(json_type))
+    }
 }
 
 impl_drop!(Document<'p, 's>, ffi::SJ_OD_document_free);
diff --git a/src/ondemand/json_type.rs b/src/ondemand/json_type.rs
new file mode 100644
index 0000000..52a24f6
--- /dev/null
+++ b/src/ondemand/json_type.rs
@@ -0,0 +1,41 @@
+#[derive(Debug, PartialEq)]
+pub enum JsonType {
+    Array = 1,
+    Object,
+    Number,
+    String,
+    Boolean,
+    Null,
+}
+
+impl From<i32> for JsonType {
+    fn from(value: i32) -> Self {
+        match value {
+            1 => JsonType::Array,
+            2 => JsonType::Object,
+            3 => JsonType::Number,
+            4 => JsonType::String,
+            5 => JsonType::Boolean,
+            6 => JsonType::Null,
+            _ => panic!("Invalid JsonType value: {}", value),
+        }
+    }
+}
+
+#[derive(Debug, PartialEq)]
+pub enum NumberType {
+    FloatingPointNumber = 1,
+    SignedInteger,
+    UnsignedInteger,
+}
+
+impl From<i32> for NumberType {
+    fn from(value: i32) -> Self {
+        match value {
+            1 => NumberType::FloatingPointNumber,
+            2 => NumberType::SignedInteger,
+            3 => NumberType::UnsignedInteger,
+            _ => panic!("Invalid NumberType value: {}", value),
+        }
+    }
+}
diff --git a/src/ondemand/mod.rs b/src/ondemand/mod.rs
index 676f185..a35efd0 100644
--- a/src/ondemand/mod.rs
+++ b/src/ondemand/mod.rs
@@ -2,6 +2,8 @@ pub(crate) mod array;
 pub(crate) mod array_iterator;
 pub(crate) mod document;
 pub(crate) mod field;
+mod json_type;
+mod number;
 pub(crate) mod object;
 pub(crate) mod object_iterator;
 pub(crate) mod parser;
@@ -11,6 +13,7 @@ pub use array::Array;
 pub use array_iterator::ArrayIterator;
 pub use document::Document;
 pub use field::Field;
+pub use json_type::{JsonType, NumberType};
 pub use object::Object;
 pub use object_iterator::ObjectIterator;
 pub use parser::Parser;
diff --git a/src/ondemand/number.rs b/src/ondemand/number.rs
new file mode 100644
index 0000000..b9814cd
--- /dev/null
+++ b/src/ondemand/number.rs
@@ -0,0 +1,38 @@
+use std::{marker::PhantomData, ptr::NonNull};
+
+use simdjson_sys as ffi;
+
+use super::{Document, NumberType};
+use crate::macros::impl_drop;
+
+pub struct Number<'a> {
+    ptr: NonNull<ffi::SJ_OD_number>,
+    _doc: PhantomData<&'a mut Document<'a, 'a>>,
+}
+
+impl<'a> Number<'a> {
+    pub fn new(ptr: NonNull<ffi::SJ_OD_number>) -> Self {
+        Self {
+            ptr,
+            _doc: PhantomData,
+        }
+    }
+
+    pub fn get_uint64(&mut self) -> u64 {
+        unsafe { ffi::SJ_OD_number_get_uint64(self.ptr.as_mut()) }
+    }
+
+    pub fn get_int64(&mut self) -> i64 {
+        unsafe { ffi::SJ_OD_number_get_int64(self.ptr.as_mut()) }
+    }
+
+    pub fn get_double(&mut self) -> f64 {
+        unsafe { ffi::SJ_OD_number_get_double(self.ptr.as_mut()) }
+    }
+
+    pub fn get_number_type(&mut self) -> NumberType {
+        unsafe { ffi::SJ_OD_number_get_number_type(self.ptr.as_mut()) }.into()
+    }
+}
+
+impl_drop!(Number<'a>, ffi::SJ_OD_number_free);
diff --git a/src/ondemand/value.rs b/src/ondemand/value.rs
index 0ea5ee1..f9959df 100644
--- a/src/ondemand/value.rs
+++ b/src/ondemand/value.rs
@@ -2,7 +2,7 @@ use std::{marker::PhantomData, ptr::NonNull};
 
 use simdjson_sys as ffi;
 
-use super::{array::Array, document::Document, object::Object};
+use super::{array::Array, document::Document, number::Number, object::Object, JsonType};
 use crate::{
     error::Result,
     macros::{impl_drop, map_result},
@@ -76,6 +76,15 @@ impl<'a> Value<'a> {
         .map(Object::new)
     }
 
+    pub fn get_number(&mut self) -> Result<Number<'a>> {
+        map_result!(
+            ffi::SJ_OD_value_get_number(self.ptr.as_mut()),
+            ffi::SJ_OD_number_result_error,
+            ffi::SJ_OD_number_result_value_unsafe
+        )
+        .map(Number::new)
+    }
+
     pub fn get_string(&mut self, allow_replacement: bool) -> Result<&'a str> {
         let sv = map_result!(
             ffi::SJ_OD_value_get_string(self.ptr.as_mut(), allow_replacement),
@@ -97,6 +106,25 @@ impl<'a> Value<'a> {
         )
         .map(Value::new)
     }
+
+    pub fn is_null(&mut self) -> Result<bool> {
+        map_result!(
+            primitive,
+            ffi::SJ_OD_value_is_null(self.ptr.as_mut()),
+            ffi::bool_result_error,
+            ffi::bool_result_value_unsafe
+        )
+    }
+
+    pub fn json_type(&mut self) -> Result<JsonType> {
+        let json_type = map_result!(
+            primitive,
+            ffi::SJ_OD_value_type(self.ptr.as_mut()),
+            ffi::int_result_error,
+            ffi::int_result_value_unsafe
+        )?;
+        Ok(JsonType::from(json_type))
+    }
 }
 
 impl_drop!(Value<'a>, ffi::SJ_OD_value_free);
diff --git a/src/prelude.rs b/src/prelude.rs
index f519ca8..3ff7085 100644
--- a/src/prelude.rs
+++ b/src/prelude.rs
@@ -1,3 +1,4 @@
-pub use crate::padded_string::{
-    load_padded_string, make_padded_string, IntoPaddedString, ToPaddedString,
+pub use crate::{
+    ondemand,
+    padded_string::{load_padded_string, make_padded_string, IntoPaddedString, ToPaddedString},
 };