how to deserialize a json document with arduinojson 7

tutorial: deserializing json with arduinojson 7

introduction
arduinojson is a popular library for handling json data in arduino projects. version 7 comes with several improvements over previous versions, including a more efficient memory management system and a simpler api. this tutorial will guide you through the process of deserializing a json document using arduinojson 7.

prerequisites
before you start, ensure you have the following:
- an arduino board (e.g., arduino uno, nano, etc.)
- the arduino ide installed on your computer
- the arduinojson library installed (version 7 or later)

to install arduinojson:
1. open the arduino ide.
2. go to **sketch** **include library** **manage libraries**.
3. in the library manager, search for "arduinojson".
4. install the latest version.

basic concepts
- **serialization**: the process of converting an object into a json string.
- **deserialization**: the process of converting a json string into an object or data structure.

json example
let's say we have the following json document that represents a simple user profile:

```json
{
"name": "john doe",
"age": 30,
"is_active": true
}
```

deserialization process
to deserialize this json document in arduinojson, follow these steps:

1. **include the arduinojson library**: start by including the library in your sketch.
2. **define a json document**: create a `dynamicjsondocument` or `staticjsondocument` to hold the deserialized data.
3. **deserialize the json string**: use the `deserializejson` function to parse the json string.
4. **access the data**: access the values using the appropriate keys.

code example

here’s a complete example demonstrating how to deserialize a json string with arduinojson 7:

```cpp
include arduinojson.h

void setup() {
// start serial communication for debugging

// json string to deserialize

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