renderlog.in ↗

Trailing Comma Fixer

Instant fixFreePrivateBrowser-only

Paste JSON with trailing comma errors and convert it into valid JSON instantly. Great for unexpected token issues caused by extra commas in objects or arrays.

  • Remove trailing commas fast
  • Fix object & array errors
  • Format valid JSON output
  • Private browser processing
JSON input

Paste JSON containing extra commas.

Corrected JSON
Ctrl+Enter Remove Trailing Commas  ·  Ctrl+Shift+M Minify

Fix JSON Trailing Comma Error

Trailing commas are a common reason JSON fails to parse. Paste your broken input, remove extra commas instantly, and generate valid JSON in one click.

Common patterns

Object trailing comma
{
  "a": 1,
}
→ corrected
{
  "a": 1
}
Array trailing comma
[1,2,]
→ corrected
[1,2]
Nested object error
{
  "user": {
    "name": "A",
  }
}
→ corrected
{
  "user": {
    "name": "A"
  }
}
Mixed structures
{
  "items": [1,2,],
}
→ corrected
{
  "items": [1,2]
}

How to use

  1. Paste broken JSON.
  2. Click Remove Trailing Commas (or press Ctrl+Enter).
  3. Review corrected output in the panel above.
  4. Copy valid JSON or download.

Features

  • Remove trailing commas instantly
  • Object and array support
  • Format corrected output
  • Browser-only private processing
  • Mobile friendly layout
  • Fast debugging workflow

Narrower than a full parse-error helper

For broader SyntaxError diagnosis (unexpected token, quotes, comments), use JSON Parse Error. This page stays focused on the trailing-comma mistake only.

Frequently asked questions

Is this free?

Yes. No sign-up required.

Is my JSON uploaded?

No. Everything runs locally in your browser.

Why are trailing commas invalid in JSON?

Strict JSON forbids a comma after the last item in an object or array. That differs from JavaScript object literals, where trailing commas are often allowed—so copy-paste is a frequent source of errors.

Can arrays have trailing commas?

No. A comma after the final element before ] makes the document invalid JSON.

Can objects have trailing commas?

No. A comma after the last property before } is invalid in strict JSON.

What if there are other errors too?

This tool strips trailing commas then parses. If something else is wrong—missing quotes, broken braces, invalid values—use Fix Invalid JSON or JSON Repair.

Does it work on mobile?

Yes. Editors and the sticky action bar are optimized for small screens.

Can I copy corrected JSON?

Yes—from the corrected JSON panel or the mobile sheet after a successful fix.

Related tools