Help Posting Replies to Tweets via X (Twitter) API Using OAuth2 in HTTP Request Node

[kadian666]

I’m trying to use the HTTP Request node in n8n to reply to tweets using the official X (Twitter) API with OAuth2 authentication. I’ve successfully fetched the tweet IDs and generated the reply text using a code node.

Now I’m trying to post a reply like this:

json

CopyEdit

{
  "text": "{{ $json.output }}",
  "reply": {
    "in_reply_to_tweet_id": "{{ $('Code').item.json.tweetId }}"
  }
}

I’m using POST https://api.twitter.com/2/tweets with:

• X OAuth2 API credential
• JSON/RAW Parameters turned ON
• Send Body = ON
• Body Content Type = JSON

But I keep getting the error:
“JSON parameter needs to be valid JSON” or sometimes “Requests with bodies must have content-type of application/json.”

I’ve confirmed:

• The OAuth2 app has tweet.write scope
• The tweet ID is valid
• The JSON structure matches X’s API docs
• I’m not sending headers manually (leaving them to OAuth2)

Not sure what I’m missing — any help appreciated!

Share the output returned by the last node

Information on your n8n setup

• n8n version:
• Database (default: SQLite):
• n8n EXECUTIONS_PROCESS setting (default: own, main):
• Running n8n via (Docker, npm, n8n cloud, desktop app):
• Operating system:

[Modulator_Kinio]

nock me, when solv

[cutecatcode]

Hi @kadian666, you need to add one header for the POST method in your case.
The header is Content-Type: application/json, to implement this with n8n, see image below.