Uncaught except map is not a function in react?

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I am experience a problem im using map to pass each value as an array to my rest api. How can i get pass this problem?

What I have tried:

import React from "react";
import './App.css';
class SideBar extends React.Component {
   
    // Constructor 
    constructor(props) {
        super(props);
   
        this.state = {
            items: [],
            DataisLoaded: false
        };
    }
   
    // ComponentDidMount is used to
    // execute the code 
    componentDidMount() {
        fetch(
"https://fe-assignment.vaimo.net/")
            .then((res) => res.json())
            .then((json) => {
                this.setState({
                    items: json,
                    DataisLoaded: true
                });
            })
    }
    render() {
        const { DataisLoaded, items } = this.state;
        if (!DataisLoaded) return <div>
            <h1> Pleses wait some time.... </h1> </div> ;
   
        return (
        <div className = "sidebar">
            <h1> Fetch data  </h1>  {
                items.map((item) => ( 
                <ol key = { item.name } >
                   { item.country }, 
                     { item.title }, 
                    { item.lead_time } 
                    </ol>
                ))
            }
        </div>
    );
}
}

Posted 14-Jun-22 3:15am

Gcobani Mkontwana

Updated 14-Jun-22 3:46am

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Richard Deeming · Accepted Answer · 2022-06-14T03:46:00

Look at the JSON being returned: it's not an array, it's a single object:

JSON

{
    "success": 1,
    "product": {
        "name": "...",
        "tags": [
            "..."
        ],
        "options": {
            "...": {
                "label": "...",
                "price": {
                    "value": ...,
                    "currency": {
                        "code": "...",
                        "symbol": "...",
                        "format": "..."
                    }
                },
                "old_price": {
                    "value": ...,
                    "currency": {
                        "code": "...",
                        "symbol": "...",
                        "format": "..."
                    }
                }
            },
            ...
        },
        "discount": {
            "amount": "...",
            "end_date": "..."
        },
        "gallery": [
            {
                "main": "..."
            }
        ],
        "shipping": {
            "method": {
                "country": "...",
                "title": "...",
                "shipping_time": {
                    "value": "...",
                    "info": "..."
                },
                "cost": {
                    "value": ...,
                    "currency": {
                        "code": "...",
                        "symbol": "...",
                        "format": "..."
                    }
                }
            },
            "lead_time": {
                "value": "...",
                "info": "..."
            },
            "props": {
                "ready_to_ship": true,
                "in_stock": true,
                "fast_dispatch": true
            }
        },
        "reviews": {
            "rating": "...",
            "count": ...,
            "total_buyers": ...
        }
    }
}

Your items variable contains a single object, which does not have a map method[^].

And with the exception of the tags and gallery properties, there's nothing in that object which would be represented as an array either.