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React Native November 15, 2023

Expo Start: How to Install Yarn to React Native Application

Writen by qasimqadir89

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  1. Open your terminal and navigate to your project directory:bashCopy code cd /Users/aa/Mobile\ Applications/TheCookBook Make sure you are in the root directory of your Expo project.
  2. Install the project dependencies:If you’re using npm, run:bashCopy codenpm install If you’re using yarn, run:bashCopy codeyarn This will install the required packages, including the Expo CLI, based on the package.json file in your project.
  3. After the installation is complete, try running the Expo development server again:bashCopy codenpx expo start This should start the development server and open the Expo Developer Tools.

Make sure to follow these steps in the project directory where your package.json file is located. If you still encounter issues, double-check for any error messages during the installation process, and let me know if there are any specific error messages you need help with. if you still can’t run expo start then follow the below steps.

  1. Clear Cache:
    • Stop the Expo development server if it’s currently running (Ctrl+C in the terminal).
    • Run the following commands to clear the yarn cache:bashCopy codeyarn cache clean
    • After clearing the cache, run yarn again to reinstall the dependencies:bashCopy codeyarn
  2. Use Expo Local CLI:
    • Expo recommends using the local CLI instead of the global one. Run the following command to use the local Expo CLI:bashCopy codenpx expo start
  3. Check Expo Installation:
    • Ensure that Expo is listed as a dependency in your package.json file. Open the package.json file in your project directory and check if there is an "expo" entry in the "dependencies" section.
    • If not, you can manually add Expo to your project by running:bashCopy codeyarn add expo orbashCopy codenpm install expo
  4. Run Expo Local CLI Directly:
    • If the issue persists, try running the Expo local CLI directly without using npx:bashCopy code./node_modules/expo-cli/bin/expo.js start

After trying these steps, you should be able to start the Expo development server without encountering the “Unable to find expo in this project” error. If the issue persists, let me know, and we can explore further solutions.

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