claude-code - 💡(How to fix) Fix API Error: 500 req_011Ca5jqeWFH9NFeuCYgEf6d [1 comments, 2 participants]

[{"error":"RangeError [ERR_CHILD_PROCESS_STDIO_MAXBUFFER]: stdout maxBuffer length exceeded\n at Socket.onChildStdout (node:child_process:484:14)\n at Socket.emit (node:events:509:20)\n at addChunk (node:internal/streams/readable:564:12)\n at readableAddChunkPushByteMode (node:internal/streams/readable:515:3)\n at Readable.push (node:internal/streams/readable:395:5)\n at Pipe.onStreamRead (node:internal/stream_base_commons:189:23)","timestamp":"2026-04-14T15:07:08.814Z"},{"error":"RangeError [ERR_CHILD_PROCESS_STDIO_MAXBUFFER]: stdout maxBuffer length exceeded\n at Socket.onChildStdout (node:child_process:484:14)\n at Socket.emit (node:events:509:20)\n at addChunk (node:internal/streams/readable:564:12)\n at readableAddChunkPushByteMode (node:internal/streams/readable:515:3)\n at Readable.push (node:internal/streams/readable:395:5)\n at Pipe.onStreamRead (node:internal/stream_base_commons:189:23)","timestamp":"2026-04-14T15:08:51.586Z"},{"error":"RangeError [ERR_CHILD_PROCESS_STDIO_MAXBUFFER]: stdout maxBuffer length exceeded\n at Socket.onChildStdout (node:child_process:484:14)\n at Socket.emit (node:events:509:20)\n at addChunk (node:internal/streams/readable:564:12)\n at readableAddChunkPushByteMode (node:internal/streams/readable:515:3)\n at Readable.push (node:internal/streams/readable:395:5)\n at Pipe.onStreamRead (node:internal/stream_base_commons:189:23)","timestamp":"2026-04-14T15:09:09.252Z"},{"error":"RangeError [ERR_CHILD_PROCESS_STDIO_MAXBUFFER]: stdout maxBuffer length exceeded\n at Socket.onChildStdout (node:child_process:484:14)\n at Socket.emit (node:events:509:20)\n at addChunk (node:internal/streams/readable:564:12)\n at readableAddChunkPushByteMode (node:internal/streams/readable:515:3)\n at Readable.push (node:internal/streams/readable:395:5)\n at Pipe.onStreamRead (node:internal/stream_base_commons:189:23)","timestamp":"2026-04-14T15:17:56.481Z"},{"error":"RangeError [ERR_CHILD_PROCESS_STDIO_MAXBUFFER]: stdout maxBuffer length exceeded\n at Socket.onChildStdout (node:child_process:484:14)\n at Socket.emit (node:events:509:20)\n at addChunk (node:internal/streams/readable:564:12)\n at readableAddChunkPushByteMode (node:internal/streams/readable:515:3)\n at Readable.push (node:internal/streams/readable:395:5)\n at Pipe.onStreamRead (node:internal/stream_base_commons:189:23)","timestamp":"2026-04-14T15:44:28.947Z"},{"error":"Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011Ca3vxs7VhZLUHiKNKKvGD"}\n at eq.generate (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:8:52336)\n at $R.makeStatusError (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:47:1652)\n at $R.makeRequest (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:47:4928)\n at process.processTicksAndRejections (node:internal/process/task_queues:104:5)","timestamp":"2026-04-14T15:52:03.326Z"},{"error":"RangeError [ERR_CHILD_PROCESS_STDIO_MAXBUFFER]: stdout maxBuffer length exceeded\n at Socket.onChildStdout (node:child_process:484:14)\n at Socket.emit (node:events:509:20)\n at addChunk (node:internal/streams/readable:564:12)\n at readableAddChunkPushByteMode (node:internal/streams/readable:515:3)\n at Readable.push (node:internal/streams/readable:395:5)\n at Pipe.onStreamRead (node:internal/stream_base_commons:189:23)","timestamp":"2026-04-14T16:48:02.479Z"},{"error":"RangeError [ERR_CHILD_PROCESS_STDIO_MAXBUFFER]: stdout maxBuffer length exceeded\n at Socket.onChildStdout (node:child_process:484:14)\n at Socket.emit (node:events:509:20)\n at addChunk (node:internal/streams/readable:564:12)\n at readableAddChunkPushByteMode (node:internal/streams/readable:515:3)\n at Readable.push (node:internal/streams/readable:395:5)\n at Pipe.onStreamRead (node:internal/stream_base_commons:189:23)","timestamp":"2026-04-14T16:49:05.369Z"},{"error":"RangeError [ERR_CHILD_PROCESS_STDIO_MAXBUFFER]: stdout maxBuffer length exceeded\n at Socket.onChildStdout (node:child_process:484:14)\n at Socket.emit (node:events:509:20)\n at addChunk (node:internal/streams/readable:564:12)\n at readableAddChunkPushByteMode (node:internal/streams/readable:515:3)\n at Readable.push (node:internal/streams/readable:395:5)\n at Pipe.onStreamRead (node:internal/stream_base_commons:189:23)","timestamp":"2026-04-14T16:51:31.080Z"},{"error":"Error: Request was aborted.\n at $R.makeRequest (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:47:3448)\n at process.processTicksAndRejections (node:internal/process/task_queues:104:5)","timestamp":"2026-04-14T17:48:17.112Z"},{"error":"Error: Reques…

TL;DR

The most likely fix is to increase the maxBuffer length for the child process to prevent the ERR_CHILD_PROCESS_STDIO_MAXBUFFER error.

Guidance

• Identify the source of the large output that is exceeding the maxBuffer length and optimize it if possible.
• Consider increasing the maxBuffer length for the child process, but be aware that this may have performance implications.
• Review the error logs to determine if there are any other underlying issues that need to be addressed.
• Verify that the issue is resolved by testing the API request again after making the necessary changes.

Example

const { exec } = require('child_process');

// Increase the maxBuffer length
const child = exec('command', { maxBuffer: 1024 * 500 });

Notes

The provided error logs indicate that the maxBuffer length is being exceeded, but the root cause of the large output is not clear. Increasing the maxBuffer length may resolve the issue, but it is recommended to investigate the source of the large output to determine if there are any underlying issues that need to be addressed.

Recommendation

Apply a workaround by increasing the maxBuffer length for the child process, as this is the most direct solution to the error being reported. However, it is recommended to also investigate the source of the large output to determine if there are any underlying issues that need to be addressed.