Home/Questions/The easy way to handle error - invalid conversion from ‘const char*’ to ‘char’?
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clarissa
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Asked: 2022-07-09T04:33:47+00:00 In:

The easy way to handle error – invalid conversion from ‘const char*’ to ‘char’?

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When I run my program, I receive the error message:

invalid conversion from 'ArduinoJson::Internals::JsonVariantAs<char*>::type {aka const char*}' to 'char*' [-fpermissive]

Here is my program:

char* sensor = root["sensor"];
char* sensor = root["sensor"].as<char*>();

// in a function whose return type is char*
return root["sensor"].as<char*>();

Can someone tell me why this error occurs and how to fix?

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1 Answer

  1. Best Answer
    Expert

    The cause: The cause of this error is that you try to put these values into a char*
    Solution: Replacing char* by const char* to fix this error.

    const char* sensor = root["sensor"];
const char* sensor = root["sensor"].as<char*>();

// change the return type of the function
return root["sensor"].as<char*>();
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