How can I clean (reset cache) of React Native using Expo. Not sure if it is cache issue

Question

I am building a simple React Native app with create-react-native-app using only react-navigation and base-64(base 64 encode/decode) as dependencies. Over time starting the app became slower and now sometimes it is getting stuck(waiting for about 30min) on "Starting packager..." after running NPM start.

I've tried starting it with "npm start -- --reset-cache" but nothing changed

Once it is up and running I don't get any error or warning in DevTools or terminal. Also there are no issues with the performance of the app

What can I do to make NPM start smooth and quickly as before? Are there any general steps I can take to troubleshoot this issue?

Here is my package.json

{
  "name": "test",
  "version": "0.1.0",
  "private": true,
  "devDependencies": {
    "jest-expo": "~27.0.0",
    "react-devtools": "^3.2.3",
    "react-native-scripts": "1.14.0",
    "react-test-renderer": "16.3.1"
  },
  "main": "./node_modules/react-native-scripts/build/bin/crna-entry.js",
  "scripts": {
    "start": "react-native-scripts start",
    "eject": "react-native-scripts eject",
    "android": "react-native-scripts android",
    "ios": "react-native-scripts ios",
    "test": "jest"
  },
  "jest": {
    "preset": "jest-expo"
  },
  "dependencies": {
    "base-64": "^0.1.0",
    "expo": "^27.0.1",
    "react": "16.3.1",
    "react-native": "~0.55.2",
    "react-navigation": "^2.11.2"
  }
}

Official Documentation clearing bundler caches

Zahir Masoodi
– Zahir Masoodi

2023-03-01 08:16:59 +00:00
Commented Mar 1, 2023 at 8:16 — Zahir Masoodi
– Zahir Masoodi, Commented Mar 1, 2023 at 8:16

Seth Lutske · Accepted Answer · 2022-06-01 17:34:30Z

294

expo r -c

According to this forum post from an Expo dev, that's the command to start it cache clean

EDIT: They have changed it from exp r -c to expo start -c

edited Jun 1, 2022 at 17:34

Seth Lutske

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answered Aug 24, 2018 at 6:31

Sebastian Berglönn

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4 Comments

tar Over a year ago

exp is now expo, r is short for start, and -c is short for --clear

xeruf Over a year ago

what if I don't want to start expo and just clean the cache?

d4rky Over a year ago

@kwoxer none of the above will remove actual React Native cache

Anthony phillips Over a year ago

based on the new npx method, it is now npx expo start -c

Mitchell Fry · Accepted Answer · 2019-01-04 10:31:08Z

51

The command to run is:

expo r -c

answered Jan 4, 2019 at 10:31

Mitchell Fry

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Comments

Rahul Dasgupta · Accepted Answer · 2023-02-12 20:13:01Z

28

For Expo 45 and below

expo r -c

For Expo 46 and above

npx expo start --clear

edited Feb 12, 2023 at 20:13

answered Jan 25, 2023 at 11:02

Rahul Dasgupta

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1 Comment

Fernando Rodrigues Coelho Over a year ago

npm start --reset-cache just gave me the error: There was a problem loading the project. This development build encountered the following error. Value of type java.lang.String cannot be converted to JSONObject.

Hugobop · Accepted Answer · 2023-08-05 20:54:18Z

14

2023 update

npx eas build -p ios --clear-cache

or

npx eas build -p android --clear-cache

answered Aug 5, 2023 at 20:54

Hugobop

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1 Comment

Daniel Cettour Mar 10 at 15:34

the question was about starting the app, not building it. npx expo start --clear will do the trick

Slavik · Accepted Answer · 2023-10-06 19:55:54Z

7

--clear-cache is a flag to clear cache before the build:

eas build -p android --clear-cache
eas build -p ios --clear-cache

all available flags, commands etc. you can see by input command:

eas build --help

answered Oct 6, 2023 at 19:55

Slavik

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Comments

duhaime · Accepted Answer · 2020-03-01 16:17:38Z

5

I was running expo build:ios and needed to clear the cached provisioning profile. I did so with:

expo build:ios --clear-provisioning-profile

To see the full list of commands that clear specific elements from the cache, run expo build:ios --help

answered Mar 1, 2020 at 16:17

duhaime

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1 Comment

Mario Murrent Over a year ago

Is expo build:ios --clear-provisioning-profile the same as expo start --clean?

Brian Tompsett - 汤莱恩 · Accepted Answer · 2021-08-15 10:28:18Z

5

In you console run:

expo start

After the QR code is shown, press SHIFT + R keys.

edited Aug 15, 2021 at 10:28

Brian Tompsett - 汤莱恩

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answered Feb 28, 2021 at 19:52

alejandro pereira ALEW140

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Comments

Expo Managed · Accepted Answer · 2023-10-20 04:15:48Z

4

npm start -c or npx expo start -c

edited Oct 20, 2023 at 4:15

answered Oct 19, 2023 at 23:36

Expo Managed

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Comments

Usama Saud · Accepted Answer · 2024-01-23 07:36:08Z

0

It will clear the cache and start the project expo start -c

answered Jan 23, 2024 at 7:36

Usama Saud

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