Can't access user from clientContext

Hi there,

I’ve built a small React app that uses a Netlify function to do an API call, and I am trying to get the user from the clientContext to be able to do some authentication checks there as well. I’m using Firebase authentication rather than Netlify Identity, and I suspect maybe that is causing this? Could you please take a look and help me understand what the issue could be?

Here is the code making the request:

const options = {
    method: "POST",
    headers: {
        "Authorization": `Bearer ${auth.currentUser.accessToken}`,
        "Content-Type": "application/json",
    url: "/.netlify/functions/shorten",
    data: JSON.stringify({
        url: url_display.textContent,

await axios(options).then((response) => {
if (response.status === 200) {
    shorturl_display.textContent =;
} else {
    return Promise.reject(response.status);

And this results in a request with these headers - from this it does seem the bearer token is being sent

However the user does not appear in the clientContext. Here is what I get when I console log the context from the netlify function on the deployed site:

context {
  callbackWaitsForEmptyEventLoop: [Getter/Setter],
  succeed: [Function (anonymous)],
  fail: [Function (anonymous)],
  done: [Function (anonymous)],
  functionVersion: '$LATEST',
  functionName: 'a70be4afcf8d23464d94b2345facd8d0581b1aea579cc3cbae12ce9b1c30f1f5',
  memoryLimitInMB: '1024',
  logGroupName: '/aws/lambda/a70be4afcf8d23464d94b2345facd8d0581b1aea579cc3cbae12ce9b1c30f1f5',
  logStreamName: '2022/01/14/[$LATEST]292c464ef9f24713ae6afc54a364f069',
  clientContext: {
    custom: {
      netlify: 'xxx'
    identity: {
      url: '',
      token: 'xxx'
  identity: undefined,
  invokedFunctionArn: 'arn:aws:lambda:us-east-1:650953327525:function:a70be4afcf8d23464d94b2345facd8d0581b1aea579cc3cbae12ce9b1c30f1f5',
  awsRequestId: '21359eb8-0f4e-45f4-b4d6-d2fc074b0438',
  getRemainingTimeInMillis: [Function: getRemainingTimeInMillis]

At first, I was not the token here at all, until I enabled Identity on the site - now at least I can access the token that was sent, but user is still not coming through. Have I missed something or could this be because I’m trying to send a Firebase token?

In my local netlify dev setup, it seems to work fine, and user appears in the clientContext:

  clientContext: {
    identity: {
      url: '',
      token: 'xxx'
    user: {
      name: 'xxx',
      iss: '',
      aud: 'xxx',
      auth_time: 1642140953,
      user_id: 'RHDNMdwSt5RMyACnYSZqcdxxaX13',
      sub: 'RHDNMdwSt5RMyACnYSZqcdxxaX13',
      iat: 1642140953,
      exp: 1642144553,
      email: 'xxx',
      email_verified: false,
      firebase: [Object]
  _stopped: false

Hi @wzub,

You’d get the user only when using Netlify Identity, not with Firebase Authentication.

Ah, I thought so - thank you for clarifying!