2025-02-17
3735
#react
Adebiyi Adedotun
20310
Feb 17, 2025 â‹… 13 min read

React Context tutorial: Complete guide with practical examples

Adebiyi Adedotun Caught in the web, breaking things and learning fast.

Recent posts:

react toastify

React-Toastify (2025 update): Setup, styling & real-world use cases

Learn how to use React-Toastify in 2025, from setup to styling and advanced use cases like API notifications, async toasts, and React-Toastify 11 updates.

Chimezie Innocent
Apr 18, 2025 â‹… 18 min read
5 Best Open Source Tools For Cross-Browser CSS Testing

5 best open source tools for cross-browser CSS testing

Discover open source tools for cross-browser CSS testing like Playwright and BrowserStack to catch rendering errors, inconsistent styling, and more.

Peter Aideloje
Apr 18, 2025 â‹… 11 min read
react suspense data fetching

How to handle data fetching with React Suspense

With the introduction of React Suspense, handling asynchronous operations like data fetching has become more efficient and declarative.

Ovie Okeh
Apr 18, 2025 â‹… 10 min read
Use TypeScript Instead Of Python For ETL Pipelines

Use TypeScript instead of Python for ETL pipelines

Build a TypeScript ETL pipeline that extracts, transforms, and loads data using Prisma, node-cron, and modern async/await practices.

Muhammed Ali
Apr 17, 2025 â‹… 6 min read
View all posts

11 Replies to "React Context tutorial: Complete guide with practical examples"

  1. What am I doing wrong? When I try, I get this error “Objects are not valid as a React child (found: object with keys…” Using react Version 17.x

    “`
    function UserProvider({children}) {
    const value = useState({
    name: ‘Guest’,
    email: false,
    is_logged_in: false,
    is_admin: false
    });

    return {children}
    }
    “`

  2. Great article! I’ve considered using context for form validation (i.e. validation errors from the server) so that all children (inputs) of a form can show validation errors without passing the errors array to each input. Redux (or similar) isn’t really appropriate here since there can be multiple forms on a page (at least we’ll need to identify each) and that validation errors are only relevant for descendants.

  3. Hi, In the Profile() method, how do I set the username? setUserDetails({username: “known-user”}) doesn’t seem to work.

  4. Traditionally, this is the case for all the reasons mentioned. Though you can try @webkrafters/react-observable-context on npm. It removes many of the redux and react context bottlenecks while making it easier to reuse your components.

  5. Also, instead of having two different contexts for passing down a value and setting the value, you can have this in one function and pass the value as an object containing the actual value and function which will update the value. For example, in your example:
    “`
    import React, { createContext, useState } from “react”;

    const UserContext = createContext(undefined);
    const UserDispatchContext = createContext(undefined);

    function UserProvider({ children }) {
    const [userDetails, setUserDetails] = useState({
    username: “John Doe”
    });

    return (

    {children}

    );
    }
    “`

    we can have this as:

    “`
    import React, { createContext, useState } from “react”;

    const UserContext = createContext(undefined);

    function UserProvider({ children }) {
    const [userDetails, setUserDetails] = useState({
    username: “John Doe”
    });

    return (

    {children}

    );
    }
    “`

    then in the component that uses this prop, obtain the values as:

    “`
    const {userDetails, setUserDetails} = useContext(UserContext);
    “`

Leave a Reply