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In this library the following types implement containers used to represent JSON data in memory:
Table 1.1. Container Types
| Type | Description | 
|---|---|
| 
                A sequence container of JSON values supporting dynamic size and fast,
                random access. The interface and performance characteristics are
                similar to  | |
| An associative container of key-value pairs with unique keys, where the key is a string and the mapped type is a JSON value. Search, insertion, and removal have average contant-time complexity. In addition, elements are stored contiguously in memory allowing cache-friendly iteration. | |
| A contiguous range of characters. The library assumes that the contents of the string holds only valid UTF-8. | |
| A special variant which can hold one of any of the six standard JSON data types. | 
These containers are explored in-depth in the sections that follow.
| ![[Note]](../../../../../doc/src/images/note.png) | Note | 
|---|---|
| Sample code and identifiers used throughout are written as if the following declarations are in effect: #include <boost/json.hpp> using namespace boost::json; |