I want to display a personalized error message like toast from apex class on aura component 

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I have developed a class in which i am retrieving custom metadata record and dispalying it on a lwc component.
But i also want to get values of each field corresponding to that record and store in variable in my lwc js file.
How can i achieve this?

I want to display a personalized error message like toast from apex class on aura component 

I have developed a class in which i am retrieving custom metadata record and dispalying it on a lwc component.
But i also want to get values of each field corresponding to that record and store in variable in my lwc js file.
How can i achieve this?