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Error

Class Napi::Error inherits from class Napi::ObjectReference and class std::exception.

The Napi::Error class is a representation of the JavaScript Error object that is thrown when runtime errors occur. The Error object can also be used as a base object for user-defined exceptions.

The Napi::Error class is a persistent reference to a JavaScript error object thus inherits its behavior from the Napi::ObjectReference class (for more info see: Napi::ObjectReference).

If C++ exceptions are enabled (for more info see: Setup), then the Napi::Error class extends std::exception and enables integrated error-handling for C++ exceptions and JavaScript exceptions.

For more details about error handling refer to the section titled Error handling.

Methods

New

Creates empty instance of an Napi::Error object for the specified environment.

Napi::Error::New(Napi::Env env);
  • [in] env: The environment in which to construct the Napi::Error object.

Returns an instance of Napi::Error object.

New

Creates instance of an Napi::Error object.

Napi::Error::New(Napi::Env env, const char* message);
  • [in] env: The environment in which to construct the Napi::Error object.
  • [in] message: Null-terminated string to be used as the message for the Napi::Error.

Returns instance of an Napi::Error object.

New

Creates instance of an Napi::Error object

Napi::Error::New(Napi::Env env, const std::string& message);
  • [in] env: The environment in which to construct the Napi::Error object.
  • [in] message: Reference string to be used as the message for the Napi::Error.

Returns instance of an Napi::Error object.

Fatal

In case of an unrecoverable error in a native module, a fatal error can be thrown to immediately terminate the process.

static NAPI_NO_RETURN void Napi::Error::Fatal(const char* location, const char* message);

The function call does not return, the process will be terminated.

Constructor

Creates empty instance of an Napi::Error.

Napi::Error::Error();

Returns an instance of Napi::Error object.

Constructor

Initializes an Napi::Error instance from an existing JavaScript error object.

Napi::Error::Error(napi_env env, napi_value value);
  • [in] env: The environment in which to construct the error object.
  • [in] value: The Napi::Error reference to wrap.

Returns instance of an Napi::Error object.

Message

std::string& Napi::Error::Message() const NAPI_NOEXCEPT;

Returns the reference to the string that represent the message of the error.

ThrowAsJavaScriptException

Throw the error as JavaScript exception.

void Napi::Error::ThrowAsJavaScriptException() const;

Throws the error as a JavaScript exception.

what

const char* Napi::Error::what() const NAPI_NOEXCEPT override;

Returns a pointer to a null-terminated string that is used to identify the exception. This method can be used only if the exception mechanism is enabled.