Common errors and problems
On this page, you’ll find the explanation and the solution to the common problems that you might get while using ArduinoJson.
Beginner gotchas
- Why can’t I use
NULL? - I found a memory leak in the library!
- Why does the output contain garbage?
- Why is the output incomplete?
deserializeJson()succeeds by I cannot read any value
Compilation errors
call of overloaded 'println(...)' is ambiguousinvalid conversion from 'const char*' to 'char*' [-fpermissive]no matching function for call to 'makeString(const int&)'no matching function for call to 'BasicJsonDocument::BasicJsonDocument()'DynamicJsonBuffer/StaticJsonBuffer is a class from ArduinoJson 5macro "min" passed 3 arguments, but takes just 2no matching function for call to 'convertToJson(...)'ambiguous overload for 'operator=' (operand types are 'String' and ...)🆕
Run-time issues
- Why does ArduinoJson return
NotSupported? - I found a memory leak in the library!
- Why is the input modified?
- Why does the output contain garbage?
- Why is the output incomplete?
- The serialized document contains
nullinstead of a string