I have a try… catch statement in my code and when there is a catch I want to send a message to me for debugging. Unfortunately I am having a bit of trouble getting headers into the message. Currently I have the following code as the body of my request to the API:

body : `Cloudflare:
      ${JSON.stringify(request.cf, null, 2)}
      Headers:
      ${JSON.stringify(request.headers)}
      Error:
      ${err}`

The cloudflare and error info es through perfectly fine, but the headers e out as {} is there any why to fix this?
Thanks!

Edit: If I remove the JSON.stringify from the request.headers I get the output [object Headers].

The output currently is:

Cloudflare:
{JSON string with lots data}
Headers:
{}
Error:
ReferenceError:…

I have a try… catch statement in my code and when there is a catch I want to send a message to me for debugging. Unfortunately I am having a bit of trouble getting headers into the message. Currently I have the following code as the body of my request to the API:

body : `Cloudflare:
      ${JSON.stringify(request.cf, null, 2)}
      Headers:
      ${JSON.stringify(request.headers)}
      Error:
      ${err}`

The cloudflare and error info es through perfectly fine, but the headers e out as {} is there any why to fix this?
Thanks!

Edit: If I remove the JSON.stringify from the request.headers I get the output [object Headers].

The output currently is:

Cloudflare:
{JSON string with lots data}
Headers:
{}
Error:
ReferenceError:…

• javascript
• cloudflare-workers

• 1 I dont understand what you are trying to do. What body is this? Why don't you stringify the full object but mix it with sting iterpolation? – The Fool Commented Dec 28, 2021 at 11:11
• 1 Well, what kind of object exactly is request and request.headers…? – deceze ♦ Commented Dec 28, 2021 at 11:37
• The body is for an API request, and the string interpolation is being used, but I cannot get the data out of the headers variable. – User_42 Commented Dec 28, 2021 at 11:37
• It would help if you edit the question to include the exact string that is generated after the body : property name. And also what it needs to be. Also try console.table(request.headers) and show that to us. – Peter B Commented Dec 28, 2021 at 11:40
• request is a variable with info about the request, and request.headers includes the headers. If I console.log(request.headers) then I get: HeadersList(44) [ 'accept', 'text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8', … ] – User_42 Commented Dec 28, 2021 at 11:46

2 Answers 2

You can do something like this:

const headers = new Headers({
  "content-type": "application/json",
  "authorization": "Basic <auth>"
});
JSON.stringify(Object.fromEntries([...headers]));

It will print something like this:

{"authorization":"Basic <auth>","content-type":"application/json"}

JSON.stringify([...request.headers])

Explained here: https://developers.cloudflare./workers/examples/logging-headers