Claude Code Persistent JSON Parse Error on Windows — stream-json Output Failure

What this error means

Claude Code Persistent JSON Parse Error on Windows is a Claude Code failure pattern reported for developers trying to fix persistent json parse errors in claude code on windows when using stream-json output format. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

Persistent JSON parse errors reported on Windows when Claude Code spawns native binary with —output-format stream-json. Affects claude.exe process communication with VSCode extension.

Common causes

• Claude Code on Windows experiences persistent JSON parse errors when the native binary outputs stream-json format. This prevents Claude Code from functioning on Windows, a major developer platform.
• Persistent JSON parse errors reported on Windows when Claude Code spawns native binary with —output-format stream-json. Affects claude.exe process communication with VSCode extension.

Quick fixes

1. Confirm the exact error signature matches Claude Code Persistent JSON Parse Error on Windows.
2. Check the Claude Code account, local tool state, and provider configuration involved in the failing workflow.
3. Compare the failing environment with a known working setup, then change one configuration value at a time.

Platform/tool-specific checks

• Verify the command, editor, extension, or API client that produced the error.
• Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
• Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

1. Capture the exact error message and the command, editor action, or request that triggered it.
2. Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
3. Review the source evidence below and compare it with your environment.
4. Apply one change at a time and rerun the smallest failing action.
5. Keep the working fix documented for the team or deployment environment.

How to prevent it

• Keep provider/tool configuration documented.
• Record non-secret diagnostics such as tool version, provider name, model name, and command path.
• Add a lightweight check before CI or production workflows depend on the tool.

Sources checked

• https://github.com/anthropics/claude-code/issues/14442

Evidence note: Persistent JSON parse errors reported on Windows when Claude Code spawns native binary with —output-format stream-json. Affects claude.exe process communication with VSCode extension.

Related errors

• Claude Code Windows installation issues
• Claude Code native binary crashes on Windows

FAQ

What should I check first?

Start with the exact Claude Code Persistent JSON Parse Error on Windows text and the smallest action that reproduces it.

Can I ignore this error?

No. Treat it as a failed Claude Code workflow until the root cause is understood.

Is this guaranteed to have one fix?

No. The imported evidence supports the troubleshooting path above, but tool behavior can vary by account, plan, version, provider, and local configuration.

How do I know the fix worked?

Rerun the same command, editor action, or request. The fix is working when that action completes without Claude Code Persistent JSON Parse Error on Windows.