Trailing Comma JSON Error

What a Trailing Comma Looks Like

{
  "name": "Ava",
  "age": 30,
}

The comma after 30 is invalid in JSON.

Why It Happens

• Manual edits in configs or sample payloads.
• Copy/paste from JavaScript object literals (which allow trailing commas).
• Templating logic that always appends commas.

Fix Workflow

1. Validate in JSON Validator to locate the error position.
2. Format with JSON Formatter to expose the line break.
3. Remove trailing commas and re-validate.

Safe Example

{
  "name": "Ava",
  "age": 30
}

FAQ

Why does JavaScript accept trailing commas but JSON does not?

JSON is a strict data interchange format; it does not allow trailing commas by specification.

Can the formatter auto-fix this?

No. The formatter requires valid JSON. Fix commas first, then format.