Editing Troubleshooting of Ollama API


Troubleshooting of [https://ollama.com/ Ollama] [https://github.com/ollama/ollama/blob/main/docs/api.md API]

{{Raise hand | text = If you have any questions about the Ollama API, you can post them on the [https://github.com/ollama/ollama/issues Ollama GitHub Repository].}}

== How to fix "json: cannot unmarshal object ..." ==

'''Error message:'''
<pre>
HTTP Error 400: {"error": "json: cannot unmarshal object into Go struct field ChatRequest.messages of type []api.Message"}
</pre>

'''Applicable Model:''' 

* {{kbd | key=gpt-oss:120b}}

'''Solution'''

Root Cause: Incorrect `messages` format. The API expects an array format, but a single object was being sent.

Incorrect Format in PHP: ❌ This is an object
<pre>
'messages' => ['role' => 'user', 'content' => $message]
</pre>

Correct Format in PHP: ✅ This is an array containing an object
<pre>
'messages' => [['role' => 'user', 'content' => $message]]  
</pre>

'''Explanation:'''
The `messages` parameter must be an array of message objects, not a single message object. Each message object should contain `role` and `content` properties. The extra square brackets `[]` wrap the message object into an array, which matches the API's expected format.

This fix resolves the `"cannot unmarshal object into Go struct field ChatRequest.messages"` error.

== Related links ==
* Forum: [https://www.reddit.com/r/ollama/ ollama]

[[Category: Tools]] 
[[Category: Ollama]]
[[Category: Revised with LLMs]]
[[Category: Generative AI]]