I am trying to connect a web service method to my lightning-datatable. The idea is when the web service is called, my data table will display the returned information. However I am getting an error due to the wire service and HTTP Get method.

I used the following link as a template for my lwc: https://www.salesforcecodecrack.com/2019/10/display-reference-data-in-lwc.html

Currently I get the following error:

[LWC component's @wire target property or method threw an error during value provisioning. Original error:
[t.forEach is not a function]]


    <lightning-card title="Static Data" icon-name="standard:record">  

        <lightning-datatable columns={columns} 


import {LightningElement, track, wire} from 'lwc';
import getData from '@salesforce/apex/WebServiceClass.getMethod';

const columns = [
        label: 'column1',
        fieldName: 'column1', 
        type: 'text',
    }, {
        label: 'column2',
        fieldName: 'column2',
        type: 'date'
    }, {
        label: 'column3',
        fieldName: 'column3',
        type: 'text'

export default class myLWC extends LightningElement {
    @track data = [];
    @track columns = columns;

    opp({error, data}) {
        if(data) {

            let currentData = [];

            data.forEach((row) => {
                let rowData = {};
                    rowData.column1 = row.column1;
                    rowData.column2 = row.column2;
                    rowData.column3 = row.column3;
                    window.console.log("No data");

            this.data = currentData;
        else if(error) {
            window.console.log("Error: " + error);


global static InnerClass getMethod(){
   InnerClass c = new InnerClass(); 
    return c;

// Inner class represent return response
global class InnerClass{        


To fix this I just removed the for each from my js since I was returning an object not an array


forEach works only on arrays, but you are returning an object.

Your code is:

global static InnerClass getMethod(){
   InnerClass c = new InnerClass(); 
    return c;

I think you need something like this.

global static List<InnerClass> getMethod(){

Also please confirm if really you need global access for the method, the public should be fine.

| improve this answer | |
  • 1
    Thanks I will try it out – M guy Jul 30 at 12:30

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.