Element in the iterator is lacking a "key" prop

import React from 'react'
import { motion } from "framer-motion"

type Props = {}

export default function Projects({}: Props) {
    const projects = [1,2];
  return (
    <motion.div  
      initial={{ opacity: 0 }}
      whileInView={{ opacity: 1 }}
      transition={{ duration: 1.5 }}
      className='h-screen relative flex overflow-hidden flex-col text-left md:flex-row max-w-full justify-even mx-auto items-center z-0'>
        <h3 className='absolute top-24 uppercase tracking-[20px] text-gray-500 text-2xl'>
            My Portfolio
        </h3>

        <div className='relative w-full flex overflow-x-scroll overflow-y-hidden snap-x snap-mandatory z-20 scrollbar-thin scrollbar-track-gray-400/20 scrollbar-thumb-[#61ff45]/80'>
            {projects.map((project, i) => (
            <div className='w-screen flex-shrink-0 snap-center flex flex-col space-y-5 items-center justify-center p-20 md:p-44 h-screen'>
                <motion.img 
                    initial={{
                        y: -300,
                        opacity: 0
                      }}
                      transition={{ duration: 1.2 }}
                      whileInView={{ opacity: 1, y: 0 }}
                      viewport={{ once: true }}
                      src="./img/PHP.png" 
                      alt="" 
                />
            
                <div className='space-y-10 px-0 md:px-10 max-w-6xl'>
                    <h4 className='text-4xl font-semibold text-center'>
                        <span className='underline decoration-[#61ff45]/50'> Case Study {i + 1} of {projects.length}:</span>  Mini Php Lexer
                    </h4>
                    <div className='text-lg text-center md:text-left'>
                        This is a lexical analyzer that aims to process and evaluate PHP code to determine if it can be executed without any problems, displaying the complete code on screen along with a breakdown of each part.
                    </div>
                </div>
            </div>
            ))}
            </div>

        <div className='w-full absolute top-[30%] bg-[#61ff45]/10 left-0 h-[500px] -skew-y-12'/>
    </motion.div>
  )
}

I'm in the process of creating my portfolio website, but when I run npm dev, I encounter an error saying "Hydration failed because the initial UI does not match what was rendered on the server." I suspect the issue is in this particular section of code as VSCode shows a "Missing 'key' prop for element in iterator" warning. As I am not very experienced with these programming languages, I am unsure about the meaning of this error.

Answer №1

Remember to include a key while using a map iterator

{projects.map((project, id) => (
            <div key={id} className='w-screen flex-shrink-0 snap-center flex flex-col space-y-5 items-center justify-center p-20 md:p-44 h-screen'>
                <motion.img ...

Answer №2

If you want to render a loop in React, make sure to include a key in the outer class.

To ensure everything works correctly, be sure to add a key like this:

{items.map((item, index) => (
        <div key={item.id} className='w-full flex justify-center items-center m-4'>

Remember not to use the index as a key, as stated in the official React documentation here.

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