Json FeathersJS错误处理程序意外标记<；问题

我正在使用MongoDB开发一个Express应用程序，并尝试将FeathersJS用于我的所有服务。在这里，我正在运行一个测试，试图从服务器向客户端获取一条错误消息，但是我对错误处理程序的响应有一个问题。我的req头包含正确的

application/json

内容，因此我假设错误处理程序应该将有效的json发送回

我知道我没有在函数中使用下一个回调函数，但是当我尝试这样做时，它会给出相同的错误，所以我认为这与错误处理程序有关。这里的任何方向都将不胜感激

第一个错误日志在服务器上，这是正确的

Bucket Services
error >>>>> Bucket validation failed
Possibly Unhandled Rejection: Bucket validation failed,  Promise { <rejected> 'Bucket validation failed' }
>>>>>> Error: Unexpected token < in JSON at position 0
    at convert (/Users/jaruesink/Documents/Projects/Buckets/node_modules/feathers-rest/node_modules/feathers-errors/lib/index.js:365:79)
    at toError (/Users/jaruesink/Documents/Projects/Buckets/node_modules/feathers-rest/lib/client/base.js:24:37)
    at process._tickCallback (internal/process/next_tick.js:103:7)

我的路由器文件：

const feathers = require('feathers');
const errorHandler = require('feathers-errors/handler');
const rest = require('feathers-rest');
const router = feathers();

const LoginService = require('../services/login_service');
const UserService = require('../services/user_service');
const BucketService = require('../services/bucket_service');

// Enable REST services
router.configure(rest());

router.use((req, res, next) => {
  res.header('Access-Control-Allow-Origin', '*');
  res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
  next();
});

router.use('/login', new LoginService());
router.use('/user', new UserService());
router.use('/bucket', new BucketService());

// Set up error handling
router.use(errorHandler());

module.exports = router;

---

我明白了，关键是正确地传递回调（next）函数作为处理错误的第三个参数。FeatherJS为您处理关于错误的拒绝承诺。然后在我的测试中，我需要将Feathers错误转换为JSON，然后才能得到消息

我将测试更改为：

  it('can validate an incorrect bucket', (done) => {
    const invalid_bucket = {
      name: 'Invalid Bucket',
    };
    bucket_service.create(invalid_bucket, {}, (error) => {
      error = error.toJSON();
      assert(error.message.length > 0);
      done();
    });
  });

以及我的创建功能，以：

  create({
    amount,
    isFund = false,
    name,
    type,
    userID: owner
  }, params, next) {
    const new_bucket = new Bucket({ name, amount, type, isFund, owner });
    return new_bucket.save()
      .then(created_bucket => Promise.resolve(created_bucket))
      .catch(next);
  }

  create({
    amount,
    isFund = false,
    name,
    type,
    userID: owner
  }, params, next) {
    const new_bucket = new Bucket({ name, amount, type, isFund, owner });
    return new_bucket.save()
      .then(created_bucket => Promise.resolve(created_bucket))
      .catch(next);
  }