Which extractors do you have configured? How your code looks like? What tesponse you get? Please provide more details.

Which extractors do you have configured? How your code looks like? What tesponse you get? Please provide more details.

The code looks like the following; it'd be awesome if you could let me know what I'm doing wrong.

        const { NlpManager } = require('node-nlp');
        let string = "example utterance"
        const nlp = new NlpManager({forceNER: true});
        const container = await containerBootstrap();
        container.use(nlp);
        nlp.settings.autoLoad = true;
        nlp.settings.autoSave = true;
        nlp.settings.threshold = 0.4,
        nlp.addLanguage('en');
        nlp.addCorpus('corpus-en.json');
        await nlp.train();
        nlp.nlp.onIntent = onIntent
        let result = await nlp.process(string);

Output continues to look like literal "{number1}" or "$number1" or however I write it, instead of the number provided in the input.

Please print out the full result. I just see that you do not initialize any entity extractors, so not sure if that does anything then. I think you need to ad a extractor https://github.com/axa-group/nlp.js/blob/master/docs/v4/ner-manager.md#built-in-entities ... the "default "one or compromise shpuld be able to extract numbers

exclaimer: My nlp is german so i have to build my number entities myself.
For build in number entity, check how to get the value of a single number if you not have already.
For the example you gave us, you have to do it this way.

{
  "intent": "id.numbers",
  "utterances": [
    "my id numbers are %number% and %number% ETH"
  ],
  "answers": [ "Your numbers are {{[entities.number.items[0].option]}} and {{[entities.number.items[1].option]}}!" ]
}

Explained here kind of:
https://github.com/axa-group/nlp.js/blob/master/docs/v4/slot-filling.md#entities-with-the-same-name
When you have multiple entities with the same name a list is generated and the structure of the object is different.

For numbers you can still use the default extractors ... (maybe it is just about the comma vs. point as decimal separator)