You should use ESLint and Prettier, which will warn you when you'll try to write unreadable and excessive code like this:

!error.message ? err = {"message": error} : err = error;

and change it like this:

err = !error.message ? {"message": error} : error;

There is even an ESLint rule for preventing using ternary operators all together:

disallow ternary operators (no-ternary)

The ternary operator is used to conditionally assign a value to a variable. Some believe that the use of ternary operators leads to unclear code.

And that's for normal assignment usage, not even for procedural usage like you're doing in your code.