Slack Dialog.open not Opening if Variable is in Title - node.js

Question

Whenever I try to add a variable to my dialog title, dialog.open does not work and no errors are thrown.
If I remove the variable from the title everything works fine, it is only when I add the variable to the title
I execute this before I define dialog
app.post('/create', function(req, res) {
var users = []
var {
text, trigger_id
} = req.body;
text = text.toUpperCase()
var issuetypes = []
axios({
method: 'get',
url: baseURL + 'project/' + text
}).then(function(response) {
for (var i = 0; i < response.data.issueTypes.length; i++) {
issuetypes.push({
label: response.data.issueTypes[i].name,
value: response.data.issueTypes[i].name
});
}
Does not work:
const dialog = {
token: botToken,
trigger_id,
dialog: JSON.stringify({
title: 'Create a new ' + text + ' Ticket',
callback_id: 'submit-ticket',
submit_label: 'Submit',
elements: [{
label: 'Project',
type: 'text',
name: 'project'
}, {
label: 'Summary',
type: 'text',
name: 'summary',
}, {
label: 'Description',
type: 'textarea',
name: 'description',
optional: true,
}, {
label: 'Type',
type: 'select',
name: 'type',
options: issuetypes,
}, {
label: 'Reporter',
type: 'select',
name: 'reporter',
optional: true,
options: [{
label: 'Reporter',
value: 'reporter'
}, ],
}, {
label: 'Link',
type: 'select',
name: 'epic',
optional: true,
options: [{
label: 'Epic',
value: 'epic'
}, ],
}, ],
}),
};
Works:
const dialog = {
token: botToken,
trigger_id,
dialog: JSON.stringify({
title: 'Create a new Ticket',
callback_id: 'submit-ticket',
submit_label: 'Submit',
elements: [{
label: 'Project',
type: 'text',
name: 'project'
}, {
label: 'Summary',
type: 'text',
name: 'summary',
}, {
label: 'Description',
type: 'textarea',
name: 'description',
optional: true,
}, {
label: 'Type',
type: 'select',
name: 'type',
options: issuetypes,
}, {
label: 'Reporter',
type: 'select',
name: 'reporter',
optional: true,
options: [{
label: 'Reporter',
value: 'reporter'
}, ],
}, {
label: 'Link',
type: 'select',
name: 'epic',
optional: true,
options: [{
label: 'Epic',
value: 'epic'
}, ],
}, ],
}),
};
Then I call dialog.open
axios.post("https://slack.com/api/dialog.open", qs.stringify(dialog))
.then(
(result) => {
res.send('');
}).catch(function(err) {
console.error(err);
})
}).catch(function(err) {
console.error(err);
})
});
Any ideas as to why dialog.open does not work?

Answer 1

The reason the Dialog is not shown when you have the variable in the title is that you exceed the maximum length of 24 chars for a title. (see here for reference)
You should however received the validation error from the API though as documented for the dialog.open method:
"The field `title` cannot be longer than 24 characters"
There must be another reason why you are not receiving it.