How to format array that needs to be used in HTTP request

Questions
1

Hi, I’m using Postmark as my transactional email provider and I’d like to send a custom email to my customers using a template that I have created.

One of the variables is called “issues” which expects an array of objects like this:

"issues": [
	{
		"title": "issue"
	},
	{
		"title": "issue 2"
	}
]

I used a function node to create an array of objects that appears to be in the same format, but when I run the http request node, I get an error regarding the issues variable.

Feels like I’m really close, but not sure how to adjust the format of my issues array to be accepted by Postmark.

Here’s a video - Loom | Free Screen & Video Recording Software

2

Hey @richardjlo , thanks for providing the context of your usecase. typically the JSON parameter needs to be a string to get successfully parsed before being sent to an API endpoint, thus stringifying the “issues” parameter should solve the problem.

Here is a workflow where I used the same data (you can use https://webhook.site to receive the HTTP requests)

{
  "nodes": [
    {
      "parameters": {
        "requestMethod": "POST",
        "url": "WEB HOOK site",
        "jsonParameters": true,
        "options": {
          "bodyContentType": "json"
        },
        "bodyParametersJson": "={\n\"issue\":{{JSON.stringify($node[\"Function\"].json[\"issues\"])}}\n}"
      },
      "name": "HTTP Request",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 1,
      "position": [
        750,
        280
      ]
    },
    {
      "parameters": {
        "functionCode": "\nitems = [\n    {\n      json:{\n        \"issues\": [\n\t      {\n\t\t    \"title\": \"issue\"\n\t      },\n\t      {\n\t\t    \"title\": \"issue 2\"\n\t      }\n         ]  \n       }\n   }\n]\n\nreturn items;"
      },
      "name": "Function",
      "type": "n8n-nodes-base.function",
      "typeVersion": 1,
      "position": [
        560,
        280
      ]
    }
  ],
  "connections": {
    "Function": {
      "main": [
        [
          {
            "node": "HTTP Request",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  }
}```

Let me know if that helps!
3

Thanks so much! Yes, that’s totally the issue. I ended up creating the body in a Set node based on @RicardoE105’s advice and that worked out for me.

4

Great to hear that!