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Trailing Comma JSON Error

Trailing commas are valid in many language literals but invalid in strict JSON. They often break CI config checks and API payload parsing.

Where It Happens

  • After the last property in an object.
  • After the last item in an array.
  • During manual edits or copied snippets from JS/TS files.

Fix Pattern

  1. Paste into JSON Validator.
  2. Remove final comma before } or ].
  3. Run Formatter for stable indentation.
  4. For version changes, verify with JSON Compare.

Prevention Tip

Add pre-commit validation for config repositories. Use formatter + validator together for every payload copied between environments.

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