npm ERR! Response timeout while trying to fetch https://registry.npmjs.org/react-is (over 30000ms)

Sounds like you have a slow connection. Try increasing the timeout from 30s to 60s by adding this to your .npmrc file:

timeout=60000

You could also try adding

prefer-offline=true

if you are trying to save bandwidth or have a slow connection

Note: if you don't have an .npmrc file setup yet, you can create one here

• for Windows: C:\Users\{username}\.npmrc
• for Mac/Linux ~/.npmrc

Or you can create one in the same directory as your project's package.json file.

Users are extremely likely to face this issue if they are on a slow internet connection. To counter this, you need to increase the timeout in the npm's config file. And here's how to do it:

1. Find the .npmrc file (located in the nodejs installation folder; in my case, it's in F:\Installations\nodejs\node_modules\npm folder. But for you, it might be in C:\program files folder).
2. Open the .npmrc file and append this line: timeout=240000 (usually it is 60 seconds I suppose, but since my connection was way slower therefore, I had to increase it to 240 seconds or 4 minutes, you can keep it 120000 for 120seconds)
3. Save the file

Since create-react-app fails midway, it can easily break npm's package.json file thus leading to this sort of issue:

Unexpected end of JSON input while parsing near

Therefore, before running the npx create-react-app, run the following command: npm cache clean --force as it cleans the cache and (i think) repairs the package.json file.

I was facing the same issue. I Solved it like this:create a new file with no name just an extinction of .npmrcopen this file in any editor and type timeout = 90000save the file and in you terminal type

npm cache clean --forcenpm install create-react-appnpx create-react-app ./

Note: this error occurs because of slow internet speed