:memo: add more API documentation

diff --git a/doc/docset/docSet.sql b/doc/docset/docSet.sql
index 287c619..4ac547a 100644
--- a/doc/docset/docSet.sql
+++ b/doc/docset/docSet.sql

@@ -47,6 +47,7 @@
 INSERT INTO searchIndex(name, type, path) VALUES ('is_structured', 'Method', 'api/basic_json/is_structured/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('items', 'Method', 'api/basic_json/items/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('json', 'Class', 'api/json/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('json_pointer', 'Class', 'api/json_pointer/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('max_size', 'Method', 'api/basic_json/max_size/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('merge_patch', 'Method', 'api/basic_json/merge_patch/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('meta', 'Function', 'api/basic_json/meta/index.html');
@@ -60,6 +61,8 @@
 INSERT INTO searchIndex(name, type, path) VALUES ('operator=', 'Operator', 'api/basic_json/operator=/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('operator==', 'Operator', 'api/basic_json/operator==/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('operator[]', 'Operator', 'api/basic_json/operator[]/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('operator""_json', 'Literal', 'api/basic_json/operator%22%22_json/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('operator""_json_pointer', 'Literal', 'api/basic_json/operator%22%22_json_pointer/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('operator value_t', 'Operator', 'api/basic_json/operator_value_t/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('ordered_json', 'Class', 'api/ordered_json/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('ordered_map', 'Class', 'api/ordered_map/index.html');

diff --git a/doc/mkdocs/docs/api/basic_json/index.md b/doc/mkdocs/docs/api/basic_json/index.md
index 67448d6..145b048 100644
--- a/doc/mkdocs/docs/api/basic_json/index.md
+++ b/doc/mkdocs/docs/api/basic_json/index.md

@@ -49,7 +49,7 @@
 ## Member types
 
 - [**value_t**](value_t.md) - the JSON type enumeration
-- json_pointer
+- [**json_pointer**](../json_pointer.md) - JSON Pointer implementation
 - json_serializer
 - [**error_handler_t**](error_handler_t.md) - type to choose behavior on decoding errors
 - cbor_tag_handler_t
@@ -245,8 +245,8 @@
 
 ## Literals
 
-- operator""_json
-- operator""_json_pointer
+- [**operator""_json**](operator%22%22_json.md) - user-defined string literal for JSON values
+- [**operator""_json_pointer**](operator%22%22_json_pointer.md) - user-defined string literal for JSON pointers
 
 ## Helper classes
 

diff --git "a/doc/mkdocs/docs/api/basic_json/operator\"\"_json.md" "b/doc/mkdocs/docs/api/basic_json/operator\"\"_json.md"
new file mode 100644
index 0000000..8c96067
--- /dev/null
+++ "b/doc/mkdocs/docs/api/basic_json/operator\"\"_json.md"

@@ -0,0 +1,32 @@
+# basic_json::operator""_json
+
+```cpp
+json operator "" _json(const char* s, std::size_t n)
+```
+
+This operator implements a user-defined string literal for JSON objects. It can be used by adding `#!cpp _json` to a
+string literal and returns a [`json`](../json.md) object if no parse error occurred.
+
+## Parameters
+
+`s` (in)
+:   a string representation of a JSON object
+
+`n` (in)
+:   length of string `s`
+
+## Return value
+
+[`json`](../json.md) value parsed from `s`
+
+## Exceptions
+
+The function can throw anything that [`parse(s, s+n)`](parse.md) would throw.
+
+## Complexity
+
+Linear.
+
+## Version history
+
+- Added in version 1.0.0.

diff --git "a/doc/mkdocs/docs/api/basic_json/operator\"\"_json_pointer.md" "b/doc/mkdocs/docs/api/basic_json/operator\"\"_json_pointer.md"
new file mode 100644
index 0000000..0316b7c
--- /dev/null
+++ "b/doc/mkdocs/docs/api/basic_json/operator\"\"_json_pointer.md"

@@ -0,0 +1,32 @@
+# basic_json::operator""_json_pointer
+
+```cpp
+json_pointer operator "" _json_pointer(const char* s, std::size_t n)
+```
+
+This operator implements a user-defined string literal for JSON Pointers. It can be used by adding `#!cpp _json_pointer`
+to a string literal and returns a [`json_pointer`](../json_pointer.md) object if no parse error occurred.
+
+## Parameters
+
+`s` (in)
+:   a string representation of a JSON Pointer
+
+`n` (in)
+:   length of string `s`
+
+## Return value
+
+[`json_pointer`](../json_pointer.md) value parsed from `s`
+
+## Exceptions
+
+The function can throw anything that [`json_pointer::json_pointer`](../json_pointer.md) would throw.
+
+## Complexity
+
+Linear.
+
+## Version history
+
+- Added in version 2.0.0.

diff --git a/doc/mkdocs/docs/api/json_pointer.md b/doc/mkdocs/docs/api/json_pointer.md
new file mode 100644
index 0000000..5aa0399
--- /dev/null
+++ b/doc/mkdocs/docs/api/json_pointer.md

@@ -0,0 +1,24 @@
+# json_pointer
+
+```cpp
+template<typename BasicJsonType>
+class json_pointer;
+```
+
+## Template parameters
+
+`BasicJsonType`
+:   a specialization of [`basic_json`](basic_json/index.md)
+
+## Member functions
+
+- (constructor)
+- **to_string** - return a string representation of the JSON pointer
+- **operator std::string**- return a string representation of the JSON pointer
+- **operator/=** - append to the end of the JSON pointer
+- **operator/** - create JSON Pointer by appending
+- **parent_pointer** - returns the parent of this JSON pointer
+- **pop_back** - remove last reference token
+- **back** - return last reference token
+- **push_back** - append an unescaped token at the end of the pointer
+- **empty** - return whether pointer points to the root document

diff --git a/doc/mkdocs/mkdocs.yml b/doc/mkdocs/mkdocs.yml
index f9fd0c3..35c7526 100644
--- a/doc/mkdocs/mkdocs.yml
+++ b/doc/mkdocs/mkdocs.yml

@@ -129,6 +129,8 @@
         - api/basic_json/operator==.md
         - api/basic_json/operator!=.md
         - api/basic_json/operator+=.md
+        - api/basic_json/operator""_json.md
+        - api/basic_json/operator""_json_pointer.md
         - api/basic_json/parse.md
         - api/basic_json/parse_event_t.md
         - api/basic_json/parser_callback_t.md
@@ -146,6 +148,7 @@
         - api/basic_json/value.md
         - api/basic_json/value_t.md
       - api/json.md
+      - api/json_pointer.md
       - api/ordered_map.md
       - api/ordered_json.md