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claude-code - 💡(How to fix) Fix Bug: /plugin marketplace add writes trailing comma in known_marketplaces.json, breaking subsequent runs

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When adding a marketplace via /plugin marketplace add, Claude Code appends a trailing comma after the last entry in ~/.claude/plugins/known_marketplaces.json. This makes the file invalid JSON, causing all subsequent /plugin marketplace add calls to fail.

Error Message

Error: Failed to load marketplace configuration: JSON Parse error: Property name must be a string literal

Root Cause

Root Cause (suspected)

Fix Action

Workaround

Manually remove the trailing comma from ~/.claude/plugins/known_marketplaces.json.

Code Example

Error: Failed to load marketplace configuration: JSON Parse error: Property name must be a string literal

---

{
  "some-marketplace": { ... },
  "last-marketplace": { ... },   <-- trailing comma
}
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Description

When adding a marketplace via /plugin marketplace add, Claude Code appends a trailing comma after the last entry in ~/.claude/plugins/known_marketplaces.json. This makes the file invalid JSON, causing all subsequent /plugin marketplace add calls to fail.

Steps to Reproduce

  1. Add one or more marketplaces using /plugin marketplace add <url>
  2. Check ~/.claude/plugins/known_marketplaces.json — the last entry has a trailing comma
  3. Run /plugin marketplace add <another-url> again

Expected Behavior

The command succeeds.

Actual Behavior

Error: Failed to load marketplace configuration: JSON Parse error: Property name must be a string literal

Root Cause (suspected)

The code that writes known_marketplaces.json appends entries with a trailing comma, producing invalid JSON like:

{
  "some-marketplace": { ... },
  "last-marketplace": { ... },   <-- trailing comma
}

Workaround

Manually remove the trailing comma from ~/.claude/plugins/known_marketplaces.json.

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