Sending Email Using SendGrid

In my website, I am having a trouble in sending gmail through SendGrid
Here is my code ;

email.jsw

//email.jsw

import {sendWithService} from 'backend/sendGrid';

export function sendEmail(subject, body) {
 const key = "xxxxxxxxxxxxxx";
 const sender = "xxxxxxxxx";
 const recipient = "to.email@domain.com";
 return sendWithService(key, sender, recipient, subject, body);
}
export function sendEmailWithRecipient(subject, body, recipient) {
 const key = "xxxxxxxxxxxxxxxxxx";
 const sender = "xxxxxxxxxx";
 return sendWithService(key, sender, recipient, subject, body);
}

sendGrid.js

//sendGrid.js

import {fetch} from 'wix-fetch'; 

export function SendInstruction(APIKey, Sender, RecipientEmail, Subject, body) {
 const url = "https://api.sendgrid.com/v3/mail/send";
 
 const MyHeaders = {
 "Authorization": "Bearer " + APIKey,
 "Content-Type": "application/json"
  };
 const MyBody = {
 "personalizations": [{
 "to": [{
 "email": RecipientEmail
      }]
    }],
 "from": {
 "email": Sender
    },
 "subject": Subject,
 "content": [{
 "type": "text/html",
 "value": body
    }],
 "template_id" : "xxxxxxxxxxxx"
  };

 return fetch(url, {
 "method": "POST",
 "headers": MyHeaders,
 "body": JSON.stringify(MyBody)
    })
    .then(Response => Response.text);   
}

Page code

import {sendEmail} from 'backend/email';
export function button6_click(event) {

if(food1 == 1){

  wixData.query('Contact').ne('email', '').limit(1000).find()
    .then(async(results) => {
 if (results.length > 0) {
 
 for (let i = 0; i < results.length; i++) {
 let item = results.items[i];
 let emailid = item.email;
 function SendClientEmail() {
const Subject = `New Submission from ${"artt"}`;
const body =  `Name: ${"body"}     
\rname: ${"fodd"}     
\ritem: ${"food"}`;     
const RecipientEmail = `emailid`;
 
            }
        }
 
        }
    })
 

}

let toInsert = {
 "name":        $w('#input1').value,
 "foodPhoto" : $w("#image1").src,
 "description" : $w('#input2').value,
 "all" : "all"

};

wixData.insert("FoodItems", toInsert)
  .then( (results) => {
 let item = results;
 
  } )
  .catch( (err) => {
 let errorMsg = err;
  } );

 wixLocation.to(`/home`); 
}

All help appreciated !
Ajith

See these two examples:

Send Email with SendGrid NPM Interface
Send an email using the SendGrid NPM library.

Send Email with SendGrid REST Interface
Send an email using the SendGrid REST API.

I managed to send Sendgrid template variables, documentation here: