Request parsing in route handlers in NextJS - Mini Project: Build & Apply

Request parsing in route handlers

📖 Scenario: You are building a simple Next.js API route that receives JSON data from a client. You want to parse the incoming request body to extract user information.

🎯 Goal: Create a Next.js API route handler that parses the JSON request body to extract name and email fields and returns a JSON response confirming the received data.

📋 What You'll Learn

Create a POST route handler function named POST in app/api/user/route.js

Parse the incoming request body as JSON using await request.json()

Extract name and email from the parsed JSON

Return a JSON response with a message confirming the received name and email

💡 Why This Matters

🌍 Real World

Parsing JSON requests is essential for building APIs that accept data from clients, such as forms or apps sending user info.

💼 Career

Understanding request parsing in Next.js route handlers is a key skill for backend and full-stack developers working with modern React frameworks.

1

Create the POST route handler function

Create an async function called POST that takes a single parameter named request.

NextJS

# Your code here

Need a hint?

In Next.js App Router, API route handlers are exported functions named after HTTP methods like POST.

2

Parse JSON from the request body

Inside the POST function, create a constant called data and assign it the result of await request.json().

NextJS

export async function POST(request) {
  // Parse JSON body
  // Your code here
}

Need a hint?

Use await request.json() to read and parse the JSON body from the incoming request.

3

Extract name and email from parsed data

Destructure name and email from the data object inside the POST function.

NextJS

export async function POST(request) {
  const data = await request.json();
  // Extract name and email
  // Your code here
}

Need a hint?

Use object destructuring to get name and email from the parsed JSON data.

4

Return a JSON response confirming the data

Return a new Response object with a JSON string body containing a message that says `Received user: ${name} with email: ${email}`. Set the Content-Type header to application/json.

NextJS

export async function POST(request) {
  const data = await request.json();
  const { name, email } = data;
  // Return JSON response
  // Your code here
}

Need a hint?

Use new Response() with a JSON string and set the Content-Type header to application/json to send a JSON response.