If you were using terminal or command prompt, closed it later on, but for some reason when you try to use it again, it says: Port 3000 is already in use (something is already running on port 3000) and then you are unable to start the app or use command that you wanted to, then this video is for you. I am using Windows, using Git for Windows for terminal program. I am using React JS app.

I will use command
npm start
This will start the app.
I can stop the app by using CTRL + C from keyboard.
I can start the app again as normal.

If I use the command again and run the app
npm start
it starts again.

If i close the terminal without stopping previous process, it says:
Port 3000 already in use
or
Something is already running on port 3000.

We can find specific port (in this case 3000) by using following command on Windows & using Git for Windows
netstat -ano | findstr :3000

We can get kill task help by using following command
taskkill /?

Then I will end process on port 3000 by using this to kill task command
taskkill -f -pid 15984
-f flag force kill the running process

We can also end running task using npx command in case of React JS or Node JS
npx kill-port 3000

You can also kill task from task manager by ending Node JS task.

So this is how you can force terminate a task running on a port. When task will be terminated, port will be free and you will be able to use that port again.

Display Data From JSON File in React
https://youtu.be/4fCr1IepJRw
Display Icons / Images from JSON File in React JS
https://youtu.be/NWG1Ygt1k1k
Fetch All Types of Data from JSON File in React JS
https://youtu.be/8nkVXiGH-7I
7 Ways to use Images in React JS
https://youtu.be/U07wzhfu66M
Easy Way to use Images in React JS
https://youtu.be/0EtYzQn-Scw
Require Image Not Working in React JS
https://www.youtube.com/watch?v=ay6id01369s
Multiple Images in One Import
https://www.youtube.com/watch?v=gEMAZSO85KY
Multiple Sets of Images from One Import in React JS
https://www.youtube.com/watch?v=SpjzhwcMcbs
Default Map is not a Function in React JS
https://www.youtube.com/watch?v=XMm12Dw_Kpw
Async Await Fetch in React JS
https://www.youtube.com/watch?v=9fr7ytpvybY
Assigned a Value but Never Used
https://youtu.be/3_4QlPxuEK4
Easily Sort Before Displaying Records in React JS
https://youtu.be/zZzcnmU_LoU
Responsive Image Gallery from Scratch in React JS
https://youtu.be/J1dg4WXr3cg

ReactJS Playground
https://youtube.com/playlist?list=PL1w28LzkbaQEdqbLVVGuR46lriyR_Ifiy
JavaScript Problem Solving:
http://bit.ly/JavsScriptProblemSolving
Web Development Essentials:
http://bit.ly/WebDevEssentials
Crash Courses:
http://bit.ly/WSPCrashCourses

Thank You!
LIKE VIDEO
SUBSCRIBE
PRESS BELL ICON
️ COMMENT

Channel: https://www.youtube.com/webstylepress
Website: https://www.webstylepress.com
FaceBook: https://www.facebook.com/webstylepress
Twitter: https://twitter.com/webstylepress
GitHub: https://github.com/webstylepress
#js #reactjs #javascript #react #fix #port #WebStylePress #webdevelopment

Please take the opportunity to connect and share this video with your friends and family if you find it useful.