Create Group > Bad Request

[owalencikecn]

Hi,
Ive installed OpenWA successfully , i can send message , but when i try to create a group a receive only bad request response.
Here my syntax
{
"name": "name_of_group",
"participants":
["33612345678@c.us"]
}

Someone had ever have this kind of trouble ?
Best regards

[rmyndharis]

Hi @owalencikecn — your payload format looks correct on the surface. The CreateGroupDto accepts participant IDs in the 628123456789@c.us format (exactly what you're using), so the 400 Bad Request isn't coming from the DTO validation itself.

A few things to check:

1. Content-Type header. Make sure your request includes Content-Type: application/json. Without it, the body isn't parsed as JSON and the DTO receives an empty object — which does fail validation with a 400.

   curl -X POST http://localhost:2785/api/sessions/{sessionId}/groups \\
     -H "X-API-Key: YOUR_KEY" \\
     -H "Content-Type: application/json" \\
     -d '{"name":"My Group","participants":["33612345678@c.us"]}'

2. The full error body. A NestJS validation 400 looks like {"statusCode":400,"message":[...],"error":"Bad Request"} — the message array tells you exactly which field failed. Could you share the full response body, not just the status code?

3. Participant number validity. 33612345678@c.us is a French number. Make sure that number is actually registered on WhatsApp — the engine will reject group creation if a participant can't be resolved.

4. API key role. Group creation requires an OPERATOR-role API key. If your key is VIEWER-only, you'll get a 403 (not a 400, but worth ruling out).

5. OpenWA version. Which version are you running? (cat package.json | jq .version, or the image tag.)

If you can drop the exact error response body + your version, I can pinpoint the cause right away. 🙂