Event Bridge Rules to Filter Null fields

Question

I am trying to filter payloads when a specific field is null (not empty string). 
I could not find any reference for the support of NOT condition in eb rules - with which I can write a condition e.g., [not {"fieldName": null}]

Would really appreciate if someone could help.

Answer

If you want events that the field is null, you should use `"fieldName": [null]`.

If you want events that the field is not null, you should use `"fieldName": [ { "anything-but": null } ]`.

Answer

Hello.

There is no "Not" filter, so why not try using "anything-but" instead?  
I thought that by using "anything-but", it would be possible to express that "fieldName" is other than Null.  
https://docs.aws.amazon.com/eventbridge/latest/userguide/eb-event-patterns-content-based-filtering.html#eb-filtering-anything-but

```
{"fieldName": [{"anything-but": null}]}
```

Event Bridge Rules to Filter Null fields

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