errors-handling.md

Errors handling

{% hint style="info" %} Node.js v13.5+ new argument params help you trace warnings and errors

• --trace-uncaught
• --trace-warnings

Example, node --trace-uncaught server.js {% endhint %}

Error handling

{% hint style="warning" %} Only async route functions and middlewares are handled {% endhint %}

app.setErrorHandler(
  (err: Error, req: HttpRequest, res: HttpResponse): HttpResponse => {
    if (checkSomething(err)) {
      return res.send({
        status: 'error',
        status_code: 500,
        message: 'oops'
      })
    }
  }
);

{% swagger baseUrl="http://localhost:8000" path="/error-route" method="get" summary="" %} {% swagger-description %}

{% endswagger-description %}

{% swagger-parameter in="path" name="" type="string" %}

{% endswagger-parameter %}

{% swagger-response status="200" description="" %}

{% endswagger-response %} {% endswagger %}

Not found handler

app.setNotFoundHandler((req: HttpRequest, res: HttpResponse): HttpResponse => {
    return res.send({ code: 404, message: 'You entered wrong url' });
});

{% swagger baseUrl="http://localhost:8000" path="/anyUrl" method="get" summary="" %} {% swagger-description %}

{% endswagger-description %}

{% swagger-parameter in="path" name="" type="string" %}

{% endswagger-parameter %}

{% swagger-response status="200" description="" %}

{% endswagger-response %} {% endswagger %}

Validation error handler

{% hint style="warning" %} Validation error handler unavailable for pro-slim version {% endhint %}

app.setValidationErrorHandler((errors: AjvValidationErrors[], req: HttpRequest, res: HttpResponse): HttpResponse => {
    return res.json({ errors });
});

{% swagger baseUrl="http://locahost:8000" path="/validate-error" method="get" summary="" %} {% swagger-description %}

{% endswagger-description %}

{% swagger-parameter in="body" name="foo" type="string" %} bar {% endswagger-parameter %}

{% swagger-response status="400" description="" %}

{
  "errors": {
    "type": "errors",
    "errors": [
      {
        "body": ["type should be string, but got ..."]
      }
    ]
  }
}

{% endswagger-response %} {% endswagger %}