How to get all the keys from a specific doc of a collection in firestore?

Question

I have already learned firestore CRUD. It is easy to get value from a document if fields are known of the doc. My question is how to grab the list of keys that the specific doc has. I need it because I want to show the fields and values in a table. If I add more fields in future in the same doc then the table will automatically be updated with the new fields and values.

Thanks.

Answer 1

As mentioned in the docs you can get a document snapshot using get() method of a document reference and then use data() method of snapshot to get all the data in the document as an object.

https://firebase.google.com/docs/firestore/query-data/get-data#get_a_document

var docRef = db.collection("users").doc("alovelace");

docRef.get().then(function(doc) {
    if (doc.exists) {
        // Here you can get your data
        console.log("Document data:", doc.data());
    } else {
        // doc.data() will be undefined in this case
        console.log("No such document!");
    }
});

Then you have an object of key values representing your document data.