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This article mainly introduces the relevant knowledge of how esp8266 parses json data, the content is detailed and easy to understand, the operation is simple and fast, and has a certain reference value, I believe you will have something to gain after reading this esp8266 article on how to parse json data, let's take a look.

# include void setup () {Serial.begin (115200); Serial.println ("here for testing the parsing of json data"); / / when defining DynamicJsonDocument objects, we need to define a size information + copy size const size_t capacity = JSON_OBJECT_SIZE (2) + 30; DynamicJsonDocument doc (capacity) / / the backslash of the json file to be parsed indicates that the coming quotation mark is not the String jsonstr = "{\" username\ ":\" admin\ ",\" pwd\ ": 123456}"; / / deserializes the data into the object deserializeJson (doc, jsonstr); / / gets the parsed data String nameStr = doc ["username"]. As (); int numberInt = doc ["pwd"]. As () / / output parsed data information through serial port monitor Serial.print ("usernameStr ="); Serial.println (nameStr); Serial.print ("pwdInt ="); Serial.println (numberInt);} void loop () {}

It is important to note that you need to install the library ArduinoJson first

Just install it in the Library Manager

Case effect

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