Displays formatted JavaScript/Node.js error stack traces with syntax highlighting and collapsible frames.

The StackTrace component displays formatted JavaScript/Node.js error stack traces with clickable file paths, internal frame dimming, and collapsible content.

See scripts/stack-trace.tsx for this example.

npx ai-elements@latest add stack-trace

Build an error display tool that shows stack traces from AI-generated code using the useChat hook.

Add the following component to your frontend:

Create val
"use client";

import { useChat } from "@ai-sdk/react";
import {
  StackTrace,
  StackTraceActions,
  StackTraceContent,
  StackTraceCopyButton,
  StackTraceError,
  StackTraceErrorMessage,
  StackTraceErrorType,
  StackTraceExpandButton,
  StackTraceFrames,
  StackTraceHeader,
} from "@/components/ai-elements/stack-trace";

export default function Page() {
  const { messages } = useChat({
    api: "/api/run-code",
  });

  return (
    <div className="max-w-4xl mx-auto p-6">
      {messages.map((message) => {
        const toolInvocations = message.parts?.filter(
          (part) => part.type === "tool-invocation",
        );

        return toolInvocations?.map((tool) => {
          if (tool.toolName === "runCode" && tool.result?.error) {
            return (
              <StackTrace
                key={tool.toolCallId}
                trace={tool.result.error}
                defaultOpen
              >
                <StackTraceHeader>
                  <StackTraceError>
                    <StackTraceErrorType />
                    <StackTraceErrorMessage />
                  </StackTraceError>
                  <StackTraceActions>
                    <StackTraceCopyButton />
                    <StackTraceExpandButton />
                  </StackTraceActions>
                </StackTraceHeader>
                <StackTraceContent>
                  <StackTraceFrames />
                </StackTraceContent>
              </StackTrace>
            );
          }
          return null;
        });
      })}
    </div>
  );
}

Add the following route to your backend:

Create val
import { streamText, tool } from "ai";
import { z } from "zod";

export async function POST(req: Request) {
  const { messages } = await req.json();

  const result = streamText({
    model: "openai/gpt-4o",
    messages,
    tools: {
      runCode: tool({
        description: "Execute JavaScript code and return any errors",
        parameters: z.object({
          code: z.string(),
        }),
        execute: async ({ code }) => {
          try {
            // Execute code in sandbox
            eval(code);
            return { success: true };
          } catch (error) {
            return { error: (error as Error).stack };
          }
        },
      }),
    },
  });

  return result.toDataStreamResponse();
}

• Parses standard JavaScript/Node.js stack trace format
• Highlights error type in red
• Dims internal frames (node_modules, node: paths)
• Collapsible content with smooth animation
• Copy full stack trace to clipboard
• Clickable file paths with line/column numbers

See scripts/stack-trace-collapsed.tsx for this example.

See scripts/stack-trace-no-internal.tsx for this example.