This seems like a super simple question but I can't find the answer for the life of me. I have an app that is going to edit records in a new Lightning App Page with a Lightning Web Component in it.

When I go to this App Page, the Id is being passed as a URL parameter.

How do I get the value of a query string parameter in the js file of a Lightning Web Component?

  • please update your post with the code you have tried and where you are stuck exactly =) thanks – glls Apr 16 '19 at 16:44
  • I don't have much code yet, I'm just starting and trying to figure out how to get the value of a query string parameter. – alex Apr 16 '19 at 16:49
  • get the value of a query string parameter in what context? lighting communities, LEX ? – glls Apr 16 '19 at 16:50
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    Not to sound rude but a simple google search on 'get record id in LWC' would have answered your question. Something like this developer.salesforce.com/docs/component-library/documentation/… – devforce Apr 16 '19 at 17:07
  • You are correct, and I did find that, but that I think that only applies to record pages not app pages. – alex Apr 18 '19 at 15:49

You simply need to specify recordId as an @api member, and the framework will give you the ID automatically.

// testClass.js
import { LightningElement, api } from 'lwc';
export default class TestClass extends LightningElement {
    @api recordId;

You should also be able to access window.location.search to identify parameters.

| improve this answer | |
  • Thank you. I think @api recordId only works for Record pages, but you reminded me that I had been way overthinking the solution and I could use basic JS functionality to get what I needed. – alex Apr 16 '19 at 17:38
  • Could you please answer a doubt I have here? If there are two params which I pass through the url, how can I access them in lwc. – Jayakrishnan Salim Mar 31 at 19:37
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    @JayakrishnanSalim window.location.search or CurrentPageReference. – sfdcfox Mar 31 at 20:06

you can pass parameter by using both @api and visualforce

1) create lightning out application and state lwc // wrapTestClass.application //

<aura:application extends="ltng:outApp" >
    <aura:dependency resource="c:testClass" />

2) create visualforce and pass parameters which defined as @api in lwc

    <apex:includeLightning />
    <div id="test"></div>

        $Lightning.use("c:wrapTestClass", function() {
            $Lightning.createComponent("c:testClass", {"recordId":"{!param}"}, "test", function(cmp, err) {}); 
| improve this answer | |

In your case the best approach will be use

@api recordId;

In other cases, where you have also other parameters the best approach is to use CurrentPageRefference.

currentPageReference.state allows you to get params.

import { LightningElement, wire } from 'lwc';
import { CurrentPageReference } from 'lightning/navigation';

export default class Test extends LightningElement {

   currentPageReference = null; 
   urlStateParameters = null;

   urlId = null;
   urlLanguage = null;
   urlType = null;

   getStateParameters(currentPageReference) {
      if (currentPageReference) {
         this.urlStateParameters = currentPageReference.state;

   setParametersBasedOnUrl() {
      this.urlId = this.urlStateParameters.id || null;
      this.urlLanguage = this.urlStateParameters.lang || null;
      this.urlType = this.urlStateParameters.type || '10';

More details you can find here https://salesforceprofs.com/how-to-get-url-params-in-lwc/

| improve this answer | |

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