N8n custom node tutorial

Batman · June 14, 2023, 12:26pm

Describe the problem/error/question

I am trying ti build a customised node and am following the n8n declarative tutorial which calls the nasa api. I have finished writing the code but am getting a 403 error for some reason and am unable to track the source of this error.

What is the error message (if any)?

HTTP Code

403

Stack

NodeApiError: Request failed with status code 403
    at RoutingNode.runNode (/Users/aaditroychowdhury/.nvm/versions/node/v18.7.0/lib/node_modules/n8n/node_modules/n8n-workflow/src/RoutingNode.ts:221:11)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at Workflow.runNode (/Users/aaditroychowdhury/.nvm/versions/node/v18.7.0/lib/node_modules/n8n/node_modules/n8n-workflow/src/Workflow.ts:1334:11)
    at /Users/aaditroychowdhury/.nvm/versions/node/v18.7.0/lib/node_modules/n8n/node_modules/n8n-core/src/WorkflowExecute.ts:952:29

Please share your workflow

{
“meta”: {
“instanceId”: “fcd038091a45b2fcc2c169311b6f49b5065e2d9f590f8c72aa493fa1ad702dba”
},
“nodes”: [
{
“parameters”: {
“resource”: “marsRoverPhotos”,
“marsRoverDate”: “2023-06-13T18:30:00.000Z”
},
“id”: “0132c11e-0ece-43bb-9412-eaea4aabc76f”,
“name”: “NASA Pics”,
“type”: “n8n-nodes-nasapics.NasaPics”,
“typeVersion”: 1,
“position”: [
840,
380
],
“credentials”: {
“NasaPicsApi”: {
“id”: “1”,
“name”: “NASA Pics account”
}
}
}
],
“connections”: {}
}

Share the output returned by the last node

Information on your n8n setup

v18
Database (default: SQLite):
n8n EXECUTIONS_PROCESS setting (default: own, main):
Running n8n via npm:
Operating system: macOS

MutedJam · June 14, 2023, 12:28pm

Seems like your custom node might be getting a 403 response from the external API it is calling.

Seeing you mentioned a tutorial in your post, have you checked out this video from our chief node builder @marcus?

Batman · June 14, 2023, 2:35pm

hi @MutedJam . thanks for the reference. However, I am still attaching the official tutorial site in case you find any discrepancies in it.

MutedJam · June 14, 2023, 2:36pm

Oh, so what you are saying is that following the exact tutorial leads to the error you have seen? Can you share your project folder so we can take a closer look?

Jon · June 14, 2023, 4:01pm

Hey @Batman,

A 403 could be that your credential data is incorrect. I would also recommend using Node 16 which is what we currently support.

Batman · June 14, 2023, 8:17pm

hey @MutedJam. I am attaching the link to the github repository as the folder is not being accepted here for some reason.
github project repository
Hope this helps.

Batman · June 14, 2023, 8:18pm

Hey @Jon. I changed the node version. However, I am getting the same error.

Jon · June 15, 2023, 9:04am

The link doesn’t appear to work, is it private? Did you double check your credentials as well?

Batman · June 15, 2023, 11:10am

my bad @Jon. I am attaching the link again. The credentials seem fine to me.
I tried to redo the entire thing and now the node does not even appear as an option on the n8n node options.
project repository

Jon · June 15, 2023, 1:34pm

Hey @Batman,

The repo doesn’t appear to have the tutorial node in it, Did you commit the changes for it?

Batman · June 15, 2023, 2:24pm

Apologies @Jon. The changes have been committed and pushed

Jon · June 15, 2023, 2:37pm

Hey @Batman,

Your node appears to be working fine for me.

Are you sure the API key you are using is correct?

Batman · June 15, 2023, 2:49pm

hey @Jon which API key are you using. Are you generating it via the NASA API?
Are you changing the api under the
authenticate = {
type: ‘generic’,
properties: {
qs: {
‘api_key’: ‘={{$credentials.apiKey}}’
}
},
} as IAuthenticateGeneric;

in NasaPicsApi.credentials.ts

I guess I am making some silly error as I am new to n8n.

Jon · June 15, 2023, 2:57pm

Hey @Batman,

I am getting a key from Nasa then inputting it into the credential in the n8n UI.

Batman · June 15, 2023, 3:05pm

hey @Jon . As I said I am not even getting the NASA Pics node option anymore for some reason.

I am running the same commands in the terminal as before, however:

npm run build
npm link
npm link n8n-nodes-nasapics
n8n start

Jon · June 15, 2023, 3:06pm

Hey @Batman,

Are you running the second npm link command in the ~/.n8n/nodes folder?

Batman · June 15, 2023, 3:22pm

hey @Jon . sorry for the inconvenience, but this is what I am doing. It worked before so I do not know what is going wrong now

Jon · June 15, 2023, 3:40pm

You need to run npm run link n8n-nodes-nasapics in the n8n nodes folder which is normally ~/.n8n/nodes

Batman · June 15, 2023, 3:48pm

I have done that too

Can you send the commands you used in your terminal. Since you pulled my code the folders must be the same. Appreciate the help

Jon · June 15, 2023, 3:55pm

Hey @Batman,

You are still not using the correct nodes folder that is why it is not working. You need to use ~/.n8n/nodes the full path for that would be something like /Users/aaditroychowdhury/.n8n/nodes so the commands would be…

npm install
npm link
cd ~/.n8n/nodes
npm link n8n-nodes-nasapics
n8n start

If ~/.n8n/nodes shows an error run mkdir ~/.n8n/nodes then the cd command.