> For the complete documentation index, see [llms.txt](https://feathersjs-mongoose.gitbook.io/feathers-mongoose-casl/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://feathersjs-mongoose.gitbook.io/feathers-mongoose-casl/docs/start-new-project-1/use-feathers-mongoose-casl-authentication.md).

# Verify user and filter user fields

We need to add authentication to app.configure

Open src/authentication.js and update file\
\
you can copy the file content from [here](https://github.com/doronnahum/feathers-mongoose-casl/blob/master/lib/src/authentication.js)<br>

```
const { AuthenticationService, JWTStrategy } = require('@feathersjs/authentication');
const { LocalStrategy } = require('@feathersjs/authentication-local');
const { expressOauth } = require('@feathersjs/authentication-oauth');
const { NotAuthenticated } = require('@feathersjs/errors');

// Add this
const { pick } = require('feathers-mongoose-casl');

module.exports = app => {
  // Add this
  const verifyEmailConfig = app.get('feathers-mongoose-casl').verifyEmail;
  const applyIsVerifiedEmail = verifyEmailConfig && verifyEmailConfig.enabled;
  //
  const authentication = new AuthenticationService(app);

  authentication.register('jwt', new JWTStrategy());
  authentication.register('local', new LocalStrategy());

  app.use('/authentication', authentication);
  app.configure(expressOauth());

  // Add this hooks
  app.service('authentication').hooks({
    before: {
      create: [
        (context) => {
          context.params.skipAbilitiesCheckFromAuthentication = true;
          return context;
        },
      ]
    },
    after: {
      create: [
        (context) => {
          const { user } = context.result;
          if (applyIsVerifiedEmail && !user.isVerified) {
            throw new NotAuthenticated('User Email is not yet verified.');
          }
          const pickMeReadFields = app.get('feathers-mongoose-casl').pickMeReadFields;

          context.dispatch = Object.assign({}, context.result, { user: pick(context.result.user, pickMeReadFields) })
          return context;
        },
      ]
    }
  });
};

```

* If you can't found src/authentication.js  file then run `$ feathers g authentication` <br>