I'm using "lightning-file-upload" LWC and it is working fine, I'm just not sure how to access the file name and document ID as mentioned in the knowledge article below: https://developer.salesforce.com/docs/component-library/bundle/lightning-file-upload/documentation

Below is my LWC code:


<lightning-card title="CSV File Uploader" icon-name="custom:custom20">

JS File

import { LightningElement, track,api } from 'lwc';
import {ShowToastEvent} from 'lightning/platformShowToastEvent';
import startProcessing from '@salesforce/apex/GIM_CsvUploader.startProcessing';

export default class CsvFileUpload extends LightningElement {
    @api recordId;

    get acceptedFormats() {
        return ['.csv'];

        let strFileNames = '';
        // Get the list of uploaded files
        const uploadedFiles = event.detail.files;
        startProcessing({ DocId: this.recordId, Name: 'test'}) 
        alert( event.detail.files[0].Name);
            new ShowToastEvent({
                title: 'Success!!',
                message: ' Following files uploaded Successfully: ',
                variant: 'success',

According to the documentation the alert should show the file name of the first uploaded file but it says undefined.

  • 1
    name start with lowelcase. alert( event.detail.files[0].name); JS is case sensitive – Torsen Sep 5 '19 at 13:59

You are having issue with case sensitivity of name attribute in alert( event.detail.files[0].Name);


The event fired when files are uploaded successfully.The uploadfinished event returns the following parameter.

PARAMETER TYPE DESCRIPTION files object The list of files that are uploaded.

event.detail.files returns a list of uploaded files with the attributes name and documentId.

  1. name: The file name in the format filename.extension, for example, account.jpg.
  2. documentId: The ContentDocument Id in the format 069XXXXXXXXXXXX.

If you pay attention to Your code, you have used Capital N in name attribute whereas expected is small as JavaScript is case sensitive.

alert(uploadedFiles[0].name); // it will work fine
  • thanks Sanket, really stupid on my part! – Zarq Iqbal Sep 5 '19 at 15:06

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