What Is Metadata? The Metadatais data (information) about data and the Meta tag provides metadata about the HTML document.
As An Example in HTML,
The Metadatawill 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 tags always inside the 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,
How to Create Meta Tags in React ?
How to Update meta tags in React?
How to use Meta Tags with Dynamic Value in React?
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 1title>
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>
