react change port

March 24, 2021

Symtom

react's default dev port is 3000.
I'd like to use another port(80).

Cause

react server use env PORT=3000

Solution

use env for current shell
```
export PORT=80
```
or use .env in project dir
```
PORT=80
```

or use react-scripts

"scripts": {
 "start": “PORT=80 react-scripts start"