How to send personalized emails to multiple addresses using sendgrid in NodeJS - node.js

Question

I have an array of email addresses and an array of passwords. I want to send each password to its corresponding email address(email at same index) in the body of email. But I don't want to use a loop. Is it possible to use substitution in the email body and then have sendgrid pick a value from the password array for each email address.
I know I can construct a personalizations object like so :
personalizations: {to: [{email: "email1"}], substitutions: {"-pwd-": "pwd1"}}
and then use -pwd- in the body of email.
But to construct this object I again have to use a loop which I don't want.

Answer 1

Haven't tried it out, but according to the SendGrid Docs it should be able.
The given example in the docs (for SendGrid API v3) looks the following way:
{
"personalizations": [
{
"to": [
{
"email": "john#domain.com",
"name": "John"
}
],
"subject": "Example 01",
"substitutions": {
"-name-": "John"
}
},
{
"to": [
{
"email": "jane#domain.com",
"name": "Jane"
}
],
"subject": "Example 02",
"substitutions": {
"-name-": "Jane"
}
},
{
"to": [
{
"email": "matt#domain.com",
"name": "Matt"
}
],
"subject": "Example 03",
"substitutions": {
"-name-": "Matt"
}
}
],
"from": {
"email": "sender#senddomain.com",
"name": "Sender"
},
"reply_to": {
"email": "sender#senddomain.com",
"name": "Sender"
},
"subject": "Example",
"content": [
{
"type": "text/plain",
"value": "Hello -name-,"
},
{
"type": "text/html",
"value": "Hello -name-,"
}
]
}
By using Dynamic Transactional Templates it should work the same way with handlebars.