React.js Tutorial
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Tutorials React.js Tutorial

JSX Expressions — Complete Guide

JSX Expressions — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of React.js Tutorial on Toolliyo Academy.

8 min read Updated 6/23/2026
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React.js Tutorial · Lesson 7 of 100

JSX Expressions

Beginner → Intermediate → Advanced → Professional

Beginner · 1 — Learn by example · ~6 min · Module 1: React Basics & Setup

What is this?

JSX expressions let you put JavaScript values inside JSX using curly braces { }. Numbers, variables, and simple math all show up on screen.

Why should you care?

Static text is rare in real apps. You need to show user names, prices, and counts — expressions do that.

See it live — copy this example

Paste into src/App.jsx (or the file noted in the steps). Save and watch the browser update.

function PriceTag() {
  const price = 499;
  const qty = 2;
  return (
    <p>
      Total: ₹{price * qty} ({qty} items)
    </p>
  );
}

Run Example »

Edit the code and click Run to see the result update live.

Code
Result

What happened?

  • Anything inside { } is JavaScript.
  • price * qty runs before React draws the paragraph.
  • You can call functions too: {formatDate(date)}.

Try it yourself

  1. Add a const name in your component and show it in

    {name}

    .
  2. Try {2 + 2} and {10 > 5 ? "yes" : "no"}.
  3. Break it: remove a brace and read the error message.
  4. Change text or labels in the example and save — watch the browser update.
  5. Break the code on purpose (remove a bracket), read the error message, then fix it.

Remember

Use { } for dynamic values in JSX. Variables, math, and function calls work inside braces. Keep expressions short for readability.

React.js Tutorial
Course syllabus
Module 1: React Basics & Setup Introduction to React — Complete Guide React Get Started — Complete Guide Your First React App — Complete Guide React Render HTML — Complete Guide ES6 for React — Complete Guide JSX Intro — Complete Guide JSX Expressions — Complete Guide JSX Attributes — Complete Guide JSX If Statements — Complete Guide React Components — Complete Guide
Module 2: Props, Events & Lists React Props — Complete Guide Props Destructuring — Complete Guide Props Children — Complete Guide React Events — Complete Guide React Conditionals — Complete Guide React Lists & Keys — Complete Guide React CSS Styling — Complete Guide Controlled Forms — Complete Guide Form Submit — Complete Guide Multiple Form Inputs — Complete Guide
Module 3: Forms & Hooks Textarea & Select — Complete Guide Checkbox & Radio — Complete Guide useState — Complete Guide useEffect — Complete Guide useRef — Complete Guide useContext — Complete Guide useReducer — Complete Guide useCallback — Complete Guide useMemo — Complete Guide Custom Hooks — Complete Guide
Module 4: Routing & Data React Router — Complete Guide Nested Routing — Complete Guide Protected Routes — Complete Guide Lazy Routes — Complete Guide React Portals — Complete Guide Fetch API — Complete Guide Axios — Complete Guide Error Handling — Complete Guide Context API — Complete Guide React Hook Form — Complete Guide
Module 5: State & Authentication Form Validation — Complete Guide Async Forms — Complete Guide Zustand — Complete Guide Redux Toolkit — Complete Guide TanStack Query — Complete Guide Optimistic Updates — Complete Guide Query Caching — Complete Guide Authentication Flows — Complete Guide React 19 Features — Complete Guide package.json & Tooling — Complete Guide
Module 6: Architecture & React 19 Enterprise Folder Structure — Complete Guide Enterprise State Architecture — Complete Guide Enterprise Form Architecture — Complete Guide Actions — Complete Guide use() — Complete Guide Suspense — Complete Guide Concurrent Rendering — Complete Guide React Compiler — Complete Guide Server Components — Complete Guide Streaming Rendering — Complete Guide
Module 7: Performance Hydration — Complete Guide Memoization — Complete Guide React.memo — Complete Guide Lazy Loading — Complete Guide Code Splitting — Complete Guide Virtualization — Complete Guide Bundle Optimization — Complete Guide Web Vitals — Complete Guide Frontend Performance Tuning — Complete Guide Micro Frontends — Complete Guide
Module 8: Full-Stack & Real-Time Enterprise Scaling — Complete Guide SignalR — Complete Guide WebSockets — Complete Guide SSE — Complete Guide Next.js — Complete Guide SSR — Complete Guide SSG — Complete Guide ISR — Complete Guide ASP.NET Core Integration — Complete Guide Full-stack Enterprise Architecture — Complete Guide
Module 9: Testing & Deployment XSS Protection — Complete Guide Secure Authentication — Complete Guide Jest — Complete Guide React Testing Library — Complete Guide Cypress — Complete Guide Playwright — Complete Guide Docker Deployment — Complete Guide Kubernetes — Complete Guide Azure Deployment — Complete Guide CI/CD Pipelines — Complete Guide
Module 10: ShopCart Projects Todo App Project — Complete Guide E-Commerce Storefront Project — Complete Guide SaaS Admin Panel Project — Complete Guide Banking Dashboard Project — Complete Guide LMS Course Player Project — Complete Guide Healthcare Portal Project — Complete Guide Real-Time Monitoring Project — Complete Guide Multi-Tenant SaaS Project — Complete Guide Enterprise CRM Project — Complete Guide Micro Frontend Platform Project — Complete Guide
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