# Configuration Object

Once we have defined all our Joi specs, its time to configure our middleware. Following is a high-level schema of configuration object expected by `xpress-req-validator` 

```javascript
{
    allowUndefinedPaths: true,
    sendErrorResponse: false,
    specs: {
        GET: {},
        POST: {},
        PUT: {},
        DELETE: {},
    },
}
```

#### **allowUndefinedPaths**

if set to `true`, middleware will allow undefined routes to pass through

if set to `false`, middleware will raise an `INVALID URL` error

default is `true` 

#### sendErrorResponse

if set to `true`, middleware will send responses directly with validation errors

if set to false, middleware will pass the validation errors to next middleware

default is `false` 

Error response takes the following shape

```javascript
{
    description: 'request body params validation failed',
    errors: [
        {
            message: '"username" must only contain alpha-numeric characters',
            path: ['username'],
            context: {
                value: 'John Doe',
                key: 'username',
                label: 'username',
            },
        },
        {
            message: '"password" is required',
            path: ['password'],
            context: {
                key: 'password',
                label: 'password',
            },
        },
        {
            message: '"birthyear" is required',
            path: ['birthyear'],
            context: {
                key: 'birthyear',
                label: 'birthyear',
            },
        },
    ],
}
```