UI does not display credentials dropdown when no other parameter is defined in a node

[michal-rogala]

Describe the bug
When a custom node defines no parameters but requires a credential - node edit window in the UI does not display credential dropdown widget, and a credential cannot be set.

To Reproduce
Create a custom nodes which requires a credential object and which has an empty "properties" array. Node edit window in UI does not display dropdown to choose a credential.

Expected behavior
Node edit UI window displays credentials dropdown

Environment (please complete the following information):

• OS: [e.g. Ubuntu Linux 18.04] Docker
• n8n Version [e.g. 0.119.0] 0.181
• Node.js Version [e.g. 14.16.0] Generic n8n Docker container with added custom node using npm install
• Database system [e.g. SQLite; n8n uses SQLite as default otherwise changed] SQLite
• Operation mode [e.g. own; operation modes are own, main and queue. Default is own] own

[Joffcom]

Hey @michal-rogala,

Do you have a small example node that reproduces this?

[michal-rogala]

This is a small modification of ExampleNode - add credential requirement, remove properties. I've used my custom credential type but I believe any should do.

import { IExecuteFunctions } from 'n8n-core';
import { INodeExecutionData, INodeType, INodeTypeDescription } from 'n8n-workflow';

export class ExampleNode implements INodeType {
  description: INodeTypeDescription = {
    displayName: 'Keelvar Really Awesome Example Node',
    name: 'exampleNode',
    group: ['transform'],
    version: 1,
    description: 'Basic Example Node',
    defaults: {
      name: 'Example Node',
      color: '#772244',
    },
    inputs: ['main'],
    outputs: ['main'],
    properties: [
    ],
    credentials: [
      {
        name: 'businessAuth',
        required: true,
      },
    ],
  };

  async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
    const items = this.getInputData();

    let item: INodeExecutionData;
    let myString: string;

    // Itterates over all input items and add the key "myString" with the
    // value the parameter "myString" resolves to.
    // (This could be a different value for each item in case it contains an expression)
    for (let itemIndex = 0; itemIndex < items.length; itemIndex++) {
      myString = this.getNodeParameter('myString', itemIndex, '') as string;
      item = items[itemIndex];

      item.json['myString'] = myString;
    }

    return this.prepareOutputData(items);
  }
}

[janober]

Thanks a lot for making us aware of it. Got fixed with #3563 and will be released with the next version.

[janober]

Fix got released with n8n@0.184.0