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anthropic

Claude Code showing "JSON Parse error: Unexpected EOF" and writing excessive files on Windows

Status: resolved | Severity: degraded

Cite this incident

Timeline

Started: 2026-02-26T19:57:36.561Z

Updated: 2026-02-26T23:07:44.936Z

Resolved: 2026-02-26T23:07:44.922Z

Impact scope

Impacted regions: None reported

Impacted models: None reported

Impacted components: yyzkbfz2thpt

Official sources

Provider: anthropic

View official incident page

Updates

  • resolved

    We've confirmed this issue is resolved in Claude Code v2.1.61. Run `claude update` for the latest.

    2026-02-26T23:07:44.922Z

  • monitoring

    We have deployed a fix to this issue in version 2.1.61. Run `claude update` to get the latest version. We are monitoring for config corruption rates in this version since it is a nondeterministic, environment-dependent failure.

    2026-02-26T22:43:29.922Z

  • identified

    We are continuing to work on deploying a hotfix for this issue.

    2026-02-26T21:06:16.665Z

  • identified

    We have identified a bug where Windows users are experiencing significant write contention for the .claude.json global config file, starting with Claude Code 2.1.59. We are working on a hotfix.

    2026-02-26T19:57:36.635Z