Troubleshooting Event Issues in New Mixpanel Project with React Native

Anjali T. · 2025-10-02T15:15:01.403Z

Hi folks, I'm having trouble receiving any events in a new mixpanel project. We're using the react native SDK in an expo mobile app. We've set up a previous project in mixpanel and got events & user props coming through correctly (yay!). Now we've created a new mixpanel project and switched out the project token passed to mixpanel in the app const mixpanel = new Mixpanel(token), expecting the existing events to appear in the new project. No such luck! I've swapped the project token a few times and the issue is project-specific (i.e. the old token still works). I get no error messages and, because the old token still works fine, I'm assuming it's not an issue with my app (🤞?) As far as I can see both projects are set up identically in mixpanel. Any ideas of what's going wrong or how to debug this any further?

Troubleshooting Event Issues in New Mixpanel Project with React Native | Mixpanel Community

6 comments

· Sorted by Oldest

Anjali T.
·
·
Project settings look identical to me! (old project on the left) 👀

Anjali T.

setting up mixpanel in our app:

import { Mixpanel, MixpanelProperties } from "mixpanel-react-native";

const useNative = false; // disable Native Mode because we're using RN + expo, instead use Javascript Mode

export const createAnalyticsClient = (
  token: string,
  trackAutomaticEvents = true,
  persistentEventProperties: MixpanelProperties = {},
) => {
  const superProperties: MixpanelProperties = {
    application_id: applicationId,
    application_name: applicationName,
    app_version: nativeApplicationVersion,
    build_version: __DEV__ ? "dev" : nativeBuildVersion,
    device_name: deviceName,
    device_type: deviceType ? DeviceType[deviceType] : undefined,
    device_year_class: deviceYearClass,
    is_simulator: !isDevice,
    model_name: modelName,
    model_id: modelId,
    ...persistentEventProperties,
  };

  const mixpanel = new Mixpanel(token, trackAutomaticEvents, useNative);
  mixpanel.init(undefined, superProperties, "https://api-eu.mixpanel.com");

  return mixpanel;
};

package versions: "mixpanel-react-native": "^3.1.2", "@react-native-async-storage/async-storage": "^1.24.0",

Ross Gonsolvis
APP
·
·
This request was closed and merged into request </agent/tickets/669384|#669384> "Bad project token?".
Received via system
Eric N.
·
·
Hi Anjali! Looks like Ross merged your other support ticket, so he will communicate through email with your question. Sorry about the confusion here 🙏
Anjali T.
·
·
No worries 👍 For anyone else facing this issue: I created a brand new project in mixpanel (same setup as far as I can see), plugged the new project token into my app and it worked! I'm getting events through 🎉 I have no clue what was wrong with that one bad project but I'm deleting the bad project and proceeding with this brand new working project 🤷‍♀️
Ross Gonsolvis
APP
·
·
Hi Anjali, I will also close this thread out. Thanks again for confirming that it's working now 🙏 Let us know if we can help with anything else! Best, Ross

Anjali T.
·
·
Project settings look identical to me! (old project on the left) 👀

Anjali T.

setting up mixpanel in our app:

import { Mixpanel, MixpanelProperties } from "mixpanel-react-native";

const useNative = false; // disable Native Mode because we're using RN + expo, instead use Javascript Mode

export const createAnalyticsClient = (
  token: string,
  trackAutomaticEvents = true,
  persistentEventProperties: MixpanelProperties = {},
) => {
  const superProperties: MixpanelProperties = {
    application_id: applicationId,
    application_name: applicationName,
    app_version: nativeApplicationVersion,
    build_version: __DEV__ ? "dev" : nativeBuildVersion,
    device_name: deviceName,
    device_type: deviceType ? DeviceType[deviceType] : undefined,
    device_year_class: deviceYearClass,
    is_simulator: !isDevice,
    model_name: modelName,
    model_id: modelId,
    ...persistentEventProperties,
  };

  const mixpanel = new Mixpanel(token, trackAutomaticEvents, useNative);
  mixpanel.init(undefined, superProperties, "https://api-eu.mixpanel.com");

  return mixpanel;
};

package versions: "mixpanel-react-native": "^3.1.2", "@react-native-async-storage/async-storage": "^1.24.0",

Ross Gonsolvis
APP
·
·
This request was closed and merged into request </agent/tickets/669384|#669384> "Bad project token?".
Received via system
Eric N.
·
·
Hi Anjali! Looks like Ross merged your other support ticket, so he will communicate through email with your question. Sorry about the confusion here 🙏
Anjali T.
·
·
No worries 👍 For anyone else facing this issue: I created a brand new project in mixpanel (same setup as far as I can see), plugged the new project token into my app and it worked! I'm getting events through 🎉 I have no clue what was wrong with that one bad project but I'm deleting the bad project and proceeding with this brand new working project 🤷‍♀️
Ross Gonsolvis
APP
·
·
Hi Anjali, I will also close this thread out. Thanks again for confirming that it's working now 🙏 Let us know if we can help with anything else! Best, Ross