Conditions, like { name: null } , to query resources can't be used.

[zxh19890103]

Steps to reproduce

To fetch the data on server, I use the FIND method of service.
For example:
...service('dogs').find({ query: { name: null } }),
where I want to find all the dogs without name (the value of NAME field is NULL)

Expected behavior

Return all the dogs without name (NULL).

Actual behavior

ERROR !

[daffl]

URL query parameter values will always be strings. Conversion (e.g. the string 'true' to boolean true of null values) should be done in a before hook:

app.service('myservice').hooks({
  before: {
    async find(context) {
      const { query = {} } = context.params;

      if(query.myparam === 'null') {
        query.myparam = null;
      }
    }
  }
});

[zxh19890103]

Thank @daffl.
I wonder why feathers does not process it for this kind of query is so often.

[daffl]

Because Feathers does not know about how your data looks like and what it should convert it to. As you've seen in the example it is fairly easy adjusting everything to your needs. This is also only a limitation when using REST. If you use Socket.io data will arrive in the same format you sent.