Reset access token per execution

[feelgood-interface]

Describe the issue/error/question

I am building a custom node which uses JWT for authorization. When generating the token, the database claim must be provided. This database is currently being set in the credentials options. I have a workflow where the database can change for each executions. However, n8n saves the access token across executions. I am using the preAuthentication method to generate the token.
Is it possible to reset the access token for each execution in case the database has changed? As a workaround I added a node operation to generate the token and then setting the access token manually in the credentials via an expression.

Information on your n8n setup

• n8n version: 0.211.2

[MutedJam]

Hi @feelgood-interface, I don’t think n8n has a generic credential type supporting a JWT preAuthentication method I am afraid.

So it seems to me of handling this in your node-specific code would be the best approach here, but perhaps our resident node builder @marcus has another idea here?

[marcus]

Hi @feelgood-interface,
if you want to update the access token on each execution maybe the authenticate function could be helpful. I have recently given an example here:

Custom node PKCE connection issue

Hi @alexnemes, you can make http requests inside the credentials files using the authenticate method. [image] The authenticate function will be executed each time your descriptive node makes an api request. You have access to the credentials and you can manipulate the requestOptions, i. e. setting headers or query parameters. Since personio seems to require requesting an access token before each api request, you could also do this inside the authenticate function. Here are some n8n credenti…