Nextjs: ComponentWillMount vs getInitialProps

Question

I use next.js for my React application because it has server side rendering. When I checked the log, both methods ComponentWillMountand getInitialPropsare executed on the server side. So my question is: are there any differences between these methods? When should I run in ComponentWillMountand when should I run in getInitialProps. I do not see Next.JS mentions this.

Answer 1

GetInitialProps

• GetInitialProps is usually an asynchronous function that is good for
  asynchronous operations on the server and passes data to the page as a props.

• nextJs , Link, .

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ComponentWillMount

• lifecyle, render. .

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Answer 2

componentWillMount .

componentWillMount() . render(), setState() . constructor(). - . componentDidMount(). , .