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Showing content from https://arduinojson.org/v7/api/jsonarray/subscript/ below:

JsonArray::operator[] | ArduinoJson 7

Description

JsonArray::operator[] gets or replaces a value in the array pointed by the JsonArray.

If the JsonArray is null, this operator does nothing.

If you need to know if the insertion succeed, use JsonVariant::set() instead.

Don’t use this operator to get all values; instead, use iterators.

Signatures

ElementProxy operator[](size_t index) const;

Argument

index: the zero-based position of the value in the array.

Return value

JsonArray::operator[] returns a proxy class that allows you to use the JsonArray as a C array.

If this concept of proxy class is unfamiliar to you, just think of a JsonVariant instead.

The proxy class is non-copyable, so you cannot store it in a variable; you must use it immediately. This implies that you cannot use the auto keyword to store the result of this operator; instead, you must specify the type explicitly as show in the example below.

Example

JsonArray array = doc.to<JsonArray>();
array.add(42);
int value = array[0];
array[0] = 666;

If you want to use the auto keyword, you must specify the type explicitly:

auto value = array[0].as<int>();