Variable substitution in SendGrid templates with Nodejs does not work

Question

Following the USE CASE on SendGrids github does manage to send me the e-mail with the correct template, but the substitutions does apparently not work, and is left blank in the

Answer 1

Since what I was using was dynamic templates from SendGrid, I cannot use the "substitutions" tag, but must instead use the "dynamic_template_data" tag, see this issue. When changing the msg-object to

const msg = {
    to: '...',
    from: 'sender@example.org',
    subject: 'Hello world',
    text: 'Hello plain world!',
    html: '<p>Hello HTML world!</p>',
    templateId: '...',
    dynamic_template_data: {
        name: 'Some One',
        city: 'Denver',
    },
};

it works. This is not documented in the SendGrid-documentation as far as I can see.