claude-code - 💡(How to fix) Fix [Bug] Anthropic API Error: Invalid JSON - malformed surrogate in request body [1 comments, 2 participants]

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/feng/.local/share/claude/versions/2.1.101 (expected in multi-process scenarios)\n at Oc_ (/$bunfs/root/src/entrypoints/cli.js:2836:2153)\n at Ve6 (/$bunfs/root/src/entrypoints/cli.js:2836:1233)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-11T17:01:48.484Z"},{"error":"Error: Failed to fetch version from https://storage.googleapis.com/claude-code-dist-86c565f3-f756-42ad-8dfa-d59b1c096819/claude-code-releases/latest: unknown certificate verification error\n at VU1 (/$bunfs/root/src/entrypoints/cli.js:2834:5253)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-11T17:01:49.905Z"},{"error":"Error: Failed to fetch version from https://storage.googleapis.com/claude-code-dist-86c565f3-f756-42ad-8dfa-d59b1c096819/claude-code-releases/latest: unknown certificate verification error\n at VU1 (/$bunfs/root/src/entrypoints/cli.js:2834:5253)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-11T17:01:49.906Z"},{"error":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"The request body is not valid JSON: no low surrogate in string: line 1 column 755115 (char 755114)"},"request_id":"req_011CZxLsLJE499MkFWSf5X43"}\n at generate (/$bunfs/root/src/entrypoints/cli.js:11:53430)\n at makeRequest (/$bunfs/root/src/entrypoints/cli.js:50:4943)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-11T17:01:52.850Z"}]

TL;DR

The issue is likely caused by invalid JSON in the request body, and checking the request data for proper JSON formatting may resolve the issue.

Guidance

• Verify that the request body is valid JSON, focusing on the area around line 1, column 755115, where the error is reported.
• Check for any special characters or encoding issues that might be causing the JSON to be invalid.
• Review the code that generates the request body to ensure it is properly formatting the JSON data.
• Consider using a JSON validation tool or library to help identify and fix any issues with the request body.

Example

No specific code example can be provided without more context, but using a JSON validation function, such as JSON.parse() in JavaScript, can help identify if the request body is valid JSON.

Notes

The provided error messages indicate a problem with the request body being invalid JSON, but without more information about how the request body is generated, it's difficult to provide a more specific solution.

Recommendation

Apply a workaround by validating and fixing the JSON data in the request body, as this is the most direct way to address the reported error.