How to pass url parameter from lightning application to lwc

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Hello Trailblazers!!

While I was trying to implement a custom form element in Lightning we component, I wanted to open that in Lightning Application so that I can see the immediate results as I save the changes instead of putting it directly on the record page of the object. Apparently, I was not able to get the record id from the Lightning Application to LWC. I tried to search for many articles, documentation on this but I was not able to find the solution to the problem. The problem was, I was not getting the record in Lwc which resulted to fail uiRecordApi.

Finally, I found the obvious solution which I was not getting in my head.

1. Created public reactive for recordId.
2. Created an attribute in my lightning application with name = id, you can give whatever you want.
3. Passed that id attribute from lightning application to Lwc as a merge field.

And, yes it solved my problem. I was able to get the record id in my Lwc and uiRecordApi worked.

Here is my sample Lightning Application "TestApp"
<aura:application extends="force:slds">
    <aura:attribute name="id" type="String"/>    
    <c:formExample recordId="{!}"/>

Here is the code for LWC - Html markup.
    <div if:true={}>
        <div class="slds-form slds-form-element_stacked">
            <div class="slds-form-element">
                <label class="slds-form-element__label" for="form-element-firstName">First Name</label>
                <div class="slds-form-element__control">
                    <input type="text" id="form-element-firstName" placeholder="First Name" class="slds-input"
                        value={firstName} />

            <div class="slds-form-element">
                <label class="slds-form-element__label" for="form-element-lastName">Last Name</label>
                <div class="slds-form-element__control">
                    <input type="text" id="form-element-lastName" placeholder="Last Name" class="slds-input" required
                        value={lastName} />

            <div class="slds-form-element">
                <label class="slds-form-element__label" for="form-element-email">Email</label>
                <div class="slds-form-element__control">
                    <input type="email" id="form-element-email" placeholder="Email" class="slds-input" required
                        value={email} />

            <div class="slds-form-element">
                <label class="slds-form-element__label" for="form-element-phone">Phone</label>
                <div class="slds-form-element__control">
                    <input type="phone" id="form-element-phone" placeholder="Phone" class="slds-input"
                        value={phone} />

Here is the code for LWC - JS Controller.
import {
} from 'lwc';
import {
} from 'lightning/uiRecordApi';
const fields = [
export default class formExample extends LightningElement {
    @api recordId;
    @track contact;
    @wire(getRecord, {
        recordId: '$recordId',
    get firstName() {
    get lastName() {
    get phone() {
    get email() {

Here is the code for LWC - Meta XML.
<?xml version="1.0" encoding="UTF-8"?>
<LightningComponentBundle xmlns="" fqn="formExample">

Here is how I passed the id to the TestApp.
Hope you guys like it!
Happy Coding!!!
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