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TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received type number #183

harvey56 opened this issue Sep 4, 2019 · 4 comments


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@harvey56 harvey56 commented Sep 4, 2019


I'm trying to make requests to my firestore database in my lambda function.

I can declare a document reference as follows :
let userRef = db.collection('users').doc('hgyrirkignmght');
console.log("userRef: ", userRef); // this works

However, I cannot make a get() request :

    .then(function(doc) {
      if (doc.exists) {
          console.log("Document data:",;
      } else {
          // will be undefined in this case
          console.log("No such document!");
    .catch(function(error) {
        console.log("Error getting document:", error);

This returns the error message as stated in the title :

Error getting document: TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received type number
    at validateString (internal/validators.js:125:11)
    at Object.dirname (path.js:1260:5)

I can't tell if the error is netlify related or firebase related.

I understand from this thread (#112) that there may be issues when making firebase requests using netlify-lambda. So, I tried netlify-dev as documented. I set it up (I have a .netlify folder in my server folder). I set the proxy target as http://localhost:34567. Now, if I go to http://localhost:34567/myfunction, I still have the same error message as with netlify-lambda.

Can we know for sure if the issue comes from netlify or firebase ? Any suggestion what can be done ?

I'm aware of an alternative way of using firebase (as documented here However, it's in beta and it doesn't work either. const resp = await rp(options); would return an empty object, although I do have projects (i.e. projects.length !== 0). But here again, the issue may be firebase related, I'm not sure.

Thanks for your kind help


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@sw-yx sw-yx commented Sep 4, 2019

first of all, can we make sure that you're hitting the right url. the function should be at http://localhost:34567/.netlify/functions/myfunction

to debug, i'd take a look at where that Object.dirname is being called. it takes a while but you'll know for sure.

i've had some success pinging firebase from netlify functions. i think whats happening in some of the other issues is problems bundling Firebase SDK because it includes native C++ modules.


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@JeffML JeffML commented Oct 8, 2019

The solution here worked for me, though I am still trying to figure out what my GOOGLE_APPLICATION_CREDENTIALS path variable should be: is it root? lambda folder? ./<path>, /<path>, or just <path>? Or do I set it in netlify.toml? or in my start command in package.json?


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@sw-yx sw-yx commented Oct 8, 2019

no idea. refer to their docs i guess. good luck

@sw-yx sw-yx closed this Oct 8, 2019

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@frankcalise frankcalise commented Oct 30, 2019

Hey I can maybe help here. I just battled a bunch of firebase admin sdk + netlify function errors along the way, primarily because I wasn't too familiar with cloud functions.

For that error you're seeing about the first argument, may I ask what you're returning as the body to the response? It should be a string or if you want a JSON object, JSON.stringy it (or a buffer is allowed also).

Also the firebase app only wants to be initialized one time, so you can do something like this:

const admin = require("firebase-admin");
const serviceAccount = require("./firebase-dev.json");
const app = !admin.apps.length
? admin.initializeApp({
    credential: admin.credential.cert(serviceAccount)

export default app

and then use it in your function js

import firebase from './utils/firebase'

exports.handler = async function(event) {
  const querySnapshot = await firebase
    .where("subscription_status", "==", "trialing")
//return etc
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