In this article, you will learn what is context API in React? As well as, how context API works in React? Read the article for more insights.

2. What is a Context API in React? And How it Works?
• Front end development ecosystem is developing at a fast pace today.
New tools and libraries are released continuously. Business owners
prefer the right tool that suits website or application development.
• React JS is the most popular front-end development framework and
manages a good name in the web development space.
• Business owners wish to hire react js developers well-known in a
javascript library. It is the best asset to create a fast, simple, and scale
web application.

3. What Is Context API In React?
• Context API is a component-based front-end framework that passes
data from one component to another. It appears like passing data
from parent to child components. Certain props like UI themes,
language settings, local preferences, and others need different
components with the application.
• Context API comes to play to overcome issues and create a pathway
of sharing data values in components. It is best for react js
development to prevent prop via every app-level tree.
• If you need to work with context API, you can get proper assistance
from a developer and use them properly in the project.

4. • Context API is an important structure in react framework to share
specific data throughout different levels of application.
• One of the factors you should know is how to use react context API
with functional and class components?.
• Developers bring importance to such a component for solving prop
drilling. It is a great thing to move forward for application stability.
• API is a new addition to react framework features and supports
developers to create a wonderful project.
• Here is Sample code for context API.

5. import React, { createContext } from "react";
const UserContext = createContext();
const UserProvider = ({ children }) => {
const [name, setName] = useState("ruhi");
const [age, setAge] = useState(1);
const Birthday = () => setAge(age + 1);
return (
<UserContext.Provider value={{ name, age, Birthday }}>
{children}
</UserContext.Provider>
);
};

6. const withUser = (Child) => (props) => (
<UserContext.Consumer>
{(context) => <Child {...props} {...context} />}
</UserContext.Consumer>
);
export { UserProvider, withUser };
use them however you like
For example:
ReactDOM.render(
<UserProvider>
<App />
</UserProvider>,
document.getElementById("root")
);
export default withUser(LoginForm);

7. How it works with functional and class
components:
Context API is a great addition to react js and helps developers
eliminate challenges when passing data. It is the ideal structure to
share the data with different components and never pass data via
props.
Developers use it for special use cases. You may need to follow step by
step guidelines to use API.

8. Build context:
If you want to work with context API, you must build context with the
help of create context function.
import React from 'react';
const MyContext = React.createContext();
export default MyContext;
Create method() is important to build context and route default value
to variables and pass them. Once creating context, you can use the two
react components like provider and consumer.
React delivers a component and context object that reads a current
value from the matching provider.

9. Make the provider:
After creating context, developers import context and use them to
make a provider that calls MyProvider. In that scenario, developers
initiate things with some values and share through value prop provider
components.
Provider components for wrapping components and engage them with
access to context. It is a great method to minimize redux.

10. class App extends Component {
render() {
return (
<MyProvider>
<div className="App">
<header className="App-header">
<img src={logo} className="App-logo" alt="logo" />
<h1 className="App-title">Welcome to my web store</h1>
</header>
<ProductList />
</div>
</MyProvider>
);
}
}
It is the right way to make a provider accessible to components.
Developers wrap the app with API and eliminate the method.

11. Create consumer:
You can import context again, wrap components with it, and introduce
context arguments in a component. It is simple to use context and
props consistently.
Provider component is vital for you to wrap all components that
acquire context. You will tell which component needs to consume data.
Consumer component lets react component to focus on context
change. It is essential to make data available utilizing render prop.

12. const Cars = () => (
<MyContext.Consumer>
{context => (
<Fragment>
<h4>Cars:</h4>
{Object.keys(context.cars).map(carID => (
<Car
key={carID}
name={context.cars[carID].name}
price={context.cars[carID].price}
incrementPrice={() => context.incrementPrice(carID)}
decrementPrice={() => context.decrementPrice(carID)}
/>
))}
</Fragment>
)}
</MyContext.Consumer>
);

13. Use context:
Developers may also use react hooks in some time. React hooks allows
developers to maintain data inside functional components and does
not support class components to manage data.
React comes up with in-built hooks like useEffect, useState,
useCallback, and more. Using context is the most important hook in
react and helps developers connect and consume context.
The main role of useContext is to access a single argument.

14. UseContext is an ideal hook for managing a process cleaner than a
consumer component. It is the best asset for developers to boost
application maintainability.
Using react context is better to allow properties to a component that
nests deeply into the tree.
It is a reliable solution for a different instance of the same component.
const notes = useContext(NotesContext);

15. Context API and hooks are a necessary part of real-world application.
Import useContext and useState hooks from react are easy to build
context that calls auth context.
import React, { useState, useContext } from "react";
const AuthContext = React.createContext(undefined);
Functional component obtains children and delivers more components
to deal with state data. So, you can use outstanding features available
in react and meet react application requirements.

16. • The development community experiences great improvement and
new features in the framework to measure and optimize an
application performance.
• With the new concept, you have a great opportunity to work with
projects confidently and enjoy functionality by default. You can
prevent using third party libraries and replace redux with context API.
• Developers manipulate the data within API and connect data in
context provider to state and change parent state.

17. Conclusion:
Context API is a valuable component for an application development
project. It is easier for global data to be available to components.
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