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Name

isNull()

Class

JSONObject

Description

Determines if the value associated with the key is null, that is has no defined value (false) or if it has a value (true).

Examples

  • JSONObject json;

void setup() {

  json = new JSONObject();
  json.setInt("id", 0);
  json.setString("species", null);

  if (json.isNull("species") == true) {
    println("The species is undefined");
  } else {
    println("The ID is " + json.getString("species"));
  }
}

Syntax

  • .isNull(key)

Parameters

  • key(String)A key string.

Return

  • boolean
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