Got errors while parsing utf-8 containing data.

[zekih]

Checked other resources

• I added a very descriptive title to this issue.
• I searched the LangChain.js documentation with the integrated search.
• I used the GitHub search to find a similar question and didn't find it.
• I am sure that this is a bug in LangChain.js rather than my code.
• The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package).

Example Code

import { CopilotRuntime, LangChainAdapter } from "@copilotkit/runtime";
import { ChatOpenAI } from "@langchain/openai";

const copilotKit = new CopilotRuntime();

const model = new ChatOpenAI({
model: "gpt-4o",
apiKey: "",
});

Error Message and Stack Trace (if applicable)

No response

Description

When I use this code, the model cannot decode Turkish letters (like ü,ç) when returning to me. And this causes unparsable json error.

System Info

@copilotkit/runtime -> 1.8.4
@langchain/openai -> 0.4.5