JsonVariant

Description

A variable that can hold different type of values:

• a boolean
• a char, short, int or a long (signed or unsigned)
• a string (const char*)
• a reference to a JsonArray or JsonObject

A JsonVariant can be any of theses types at a time, but can only hold one value. Its type can change at run time.

Member functions

• JsonVariant::as<T>()
• JsonVariant::is<T>()
• JsonVariant::measureLength()
• JsonVariant::measurePrettyLength()
• JsonVariant::operator|
• JsonVariant::prettyPrintTo()
• JsonVariant::printTo()
• JsonVariant::operator[]
• JsonVariant::success()

See also

• JsonArray
• JsonObject

Keep learning

The book Mastering ArduinoJson is the best material to learn how to use ArduinoJson.

Chapter 5 explains how ArduinoJson works from the inside. For example, it dissects the class JsonVariant and explains how it works.

Chapter 7 presents new sample project and explains how they work. For example, the project “Recursive Analyzer” extracts the content of a JsonVariant recursively, i.e., it retrieves the content of all its children.