How to import CSV or JSON to firebase cloud firestore

Question

Is there a way to import CSV or JSON to firebase cloud firestore like in firebase realtime database?

Answer 1

1 - Importing only collections

If the names of your collections are not only composed of numbers, then you can define the name of the document as follows.

    ...
    ...

    } else {
        // Collection's length of is always odd.
        for (const key in data) {
          // // Resolve each collection.

          // If key is a number it means that it is not a collection
          // The variable id in this case will be the name of the document field or you 
          // can generate randomly
          let id = !isNaN(key) ? data[key].id : key;

          await resolve(data[key], [...path, id]);
        }
      }
    }

2 - Import collections and sub-collections

In the same way as in the example above, the name of the sub-collection can not contain only numbers.

    ...
    ...

    for (const key in data) {
      // Resolve each collection and remove it from document data.
      if (isCollection(data[key], [...path, key])) {
        // Remove a collection from the document data.
        delete documentData[key];

        // If key is a number it means that it is not a collection
        // The variable id in this case will be the name of the document field or you 
        // can generate randomly
        let id = !isNaN(key) ? data[key].id : key;

        // Resolve a colleciton.
        resolve(data[key], [...path, id]);
      }
    }

    ...
    ...

Note.: Changes in @Maciej Caputa's code