add meta tag in react

Add/Update Meta Tags in React | Dynamic Meta Tags

What Is Metadata? The Metadata is data (information) about data and the Meta tag provides metadata about the HTML document.

The Metadata will not be displayed on the page, but will be machine parsable.

The Meta elements are typically used to specify the following points:
1.      The page description,
2.      The page keywords,
3.      The page author of the document
4.      The page last modified
5.      The page viewport
6.      The page other metadata

Notes - The <meta> tags always inside the <head> element and meta tags always passed as name/value pairs.

As An Example in HTML,
<head>
    <meta charset="UTF-8">
    <meta name="description" content="Free Web tutorials">
    <meta name="keywords" content="HTML,CSS,XML,React, JavaScript">
    <meta name="author" content="John Doe">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>

Now come to the points,


Follow the below example step by step to do the same.

Step 1 – Install below command Using NPM,

npm install react-meta-tags --save

Note: You can also achieve this using React Helmet (a third party library)

Step 2 – Use MetaTag Component in your class Component

import React from 'react';
import MetaTags from 'react-meta-tags';

class Component1 extends React.Component {
  render() {
    return (
        <div className="wrapper">
          <MetaTags>
            <title>Your Page 1</title>
            <meta name="description" content="Your description here.." />
            <meta property="og:title" content="Your App" />
            <meta property="og:image" content="Your path/to/image.jpg" />
          </MetaTags>
          <div className="content"> Your Content here... </div>
        </div>
      )
  }
}

Note: Define id on tags so if you navigate to other page, older meta tags will be replaced/update by new ones.

Step 3 - ReactTitle Component:

If you just want to add title on a page you can use ReactTitle instead.

import React from 'react';
import {ReactTitle} from 'react-meta-tags';

class Component2 extends React.Component {
  render() {
    return (
        <div className="wrapper">
          <ReactTitle title="Your Page 2"/>
          <div className="content"> Your Page 2 Content </div>
        </div>
      )
  }
}

The Server Usage Example -

import MetaTagsServer from 'react-meta-tags/server';
import {MetaTagsContext} from 'react-meta-tags';

/* Import other required modules */
/*  some serve specific code */

app.use((req, res) => {
  //make sure you get a new metatags instance for each request
  const metaTagsInstance = MetaTagsServer();

  //react router match
  match({
    routes, location: req.url
  }, (error, redirectLocation, renderProps) => {
    let reactString;

    try{
      reactString = ReactDomServer.renderToString(
      <Provider store={store}> 
      {/*** If you are using redux ***/}
      {/* You have to pass extract method through MetaTagsContext so it can catch meta tags */}

        <MetaTagsContext extract = {metaTagsInstance.extract}>
          <RouterContext {...renderProps}/>
        </MetaTagsContext>
      </Provider>
      );
    }
    catch(e){
      res.status(500).send(e.stack);
      return;
    }

    //get all title and metatags as string
    const meta = metaTagsInstance.renderToString();

    //append metatag string to your layout
    const htmlStr = (`
      <!doctype html>
      <html lang="en-us">
        <head>
          <meta charSet="utf-8"/>
          ${meta}
        </head>
        <body>
          <div id="content">
            ${reactString}
          </div>
        </body>
      </html>  
    `);

    res.status(200).send(layout);
  });
});

As per the above code we have to do following for server rendering options -
1.      Import MetaTagsServer form server
2.      Import MetaTagsContext form server
3.      Create a new instance of MetaTagsServer
4.      Wrap your component inside MetaTagsContext and pass extract method as props
5.      Extract Meta string using renderToString of MetaTagsServer instance
6.      Append Meta string to your html template.

JSX Layout:

You might also be using React to define your layout, in which case you can use getTags method from metaTagsInstance. The layout part of above server side example will look like this.

//get all title and metatags as React elements
const metaTags = metaTagsInstance.getTags();

//append metatag string to your layout
const layout = (
  <html lang="en-us">
    <head>
      <meta charSet="utf-8"/>
      {metaTags}
    </head>
    <body>
      <div id="app" dangerouslySetInnerHTML={{__html: reactString}} />
    </body>
  </html>  
);

const htmlStr = ReactDomServer.renderToString(layout);

res.status(200).send(htmlStr);

Download the Source code - https://github.com/s-yadav/react-meta-tags

Note: You can also achieve this using React Helmet (a third partylibrary)
ANIL SINGH

Anil Singh is an author, tech blogger, and software programmer. Book writing, tech blogging is something do extra and Anil love doing it. For more detail, kindly refer to this link..
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