How to return custom error messages in dotnet core Web Api

Question

I am writing a web api using dot net core. The functionality is simple when users enter and invalid username or password I want to return, invalid username or password as a json response. How can I do this in dot net core, I have managed to return this

Invalid username or password

How can I return this instead

{ "message": "Invalid Login credentials!" }

this is my controller

  [HttpPost]
            [Route("/api/[controller]/signin")]
            public async Task<IActionResult> Login([FromBody] LoginViewModel loginmodel)
            {
                if (!ModelState.IsValid)
                {
                    //return BadRequestModelState();
                    return Conflict(new ErrorViewModel("Wrong data sent"));
                }
    
    
                Users user = await _userService.GetByEmail(loginmodel.Username);
                if (user == null)
                {
                   
                    return this.StatusCode(StatusCodes.Status401Unauthorized, "Invalid username or password");
                }
    
                bool isCorrectPassword = _passwordHasher.VerifyPassword(loginmodel.Password, user.Password);
                if (!isCorrectPassword)
                {
                    return this.StatusCode(StatusCodes.Status401Unauthorized, "Invalid username or password");
                }
}

AndrewSilver · Accepted Answer · 2021-10-07 12:49:05Z

7

One of the simplest ways

return StatusCode(StatusCodes.Status401Unauthorized, new { message = "Invalid username or password" });

answered Oct 7, 2021 at 12:49

AndrewSilver

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d0rf47 Over a year ago

How are you able to read the message string on the client when handling the response in JS?

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