@jonatandor35 Thanks JD, you’ve been very helpful!
Can I bug you for another query?
After inserting the {, the error resolved, but of course a new one popped up. 
On the page code, I’m getting an ‘undefined element’ error on the getPdfUrl (after await in line 9). On the back end code, I’m not getting the same error about the undefined element. (snippet below)
export async function getPdfUrl(data) {
const {response} = await Client.output(templateID, data, undefined, undefined, {output: ‘url’ })
return response}
Help is welcome, and if there’s a link to a tutorial I should check instead of bugging you, that’d be great also.
jana