UnblockDevs
Back to Tools

Fix "Expected ',' or } after property value" Error

Complete guide to fixing this JSON syntax error

The "Expected ',' or } after property value" error occurs when JSON has a syntax issue with property separators. The parser expects either a comma to continue with more properties, or a closing brace to end the object.

This is usually caused by missing commas between properties or trailing commas. Learn how to fix it instantly using our free JSON Fixer tool.

Common Causes

  • Missing comma between properties
  • Trailing comma before closing brace
  • Extra comma in wrong place
  • Missing closing brace

Broken JSON Examples

❌ Missing Comma:

{
  "name": "John"
  "age": 30  ← Missing comma
}

Error: Expected ',' or } after property value

✅ Fixed JSON:

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

Fix This Error Instantly — Try It Below

Paste your broken JSON and click Fix — our tool auto-repairs missing commas and syntax errors.

Advanced JSON Fixer & Recovery Engine

Paste → Instant fix. Repair malformed JSON: trailing commas, missing quotes, broken arrays, AI-generated JSON — 100% client-side

Repair options

Fix from API error

Paste an error like "Unexpected token } in JSON at position 245" to highlight the position.

or paste JSON below

JSON Input

1
1

Fixed JSON Output

Fixed JSON will appear here...

JSON Fixer Features

Automatic Error Detection

Scans and identifies all JSON syntax errors automatically

Smart JSON Repair

Fixes common errors like trailing commas, single quotes, and unquoted keys

Precise Error Location

Shows exact line and column numbers for each error

Visual Error Highlighting

Highlights problematic lines with color-coded indicators

Learn More About JSON Fixing

10 Most Common JSON Mistakes Developers Make

Learn about the most common JSON mistakes and how to fix them instantly with examples.

Read Guide →

25 Broken JSON Examples and How to Fix Them

Real-world broken JSON examples with step-by-step fixes and explanations.

Read Guide →

Why JSON Breaks in Real-World APIs

Understand why APIs return broken JSON in production and how to fix it effectively.

Read Guide →

How JSON Fixers Work Internally

Learn how JSON fixers work internally and why manual fixing often fails.

Read Guide →

Fix "Expected Comma or Closing Brace" JSON Error

The "Expected comma or closing brace after property value" error means your JSON is missing a comma between two properties or between an array element and the next one, or it has a missing closing brace } or bracket ]. This is one of the most common JSON syntax errors and is usually caused by copy-pasting or manually editing JSON without checking the structure.

Common triggers: trailing commas after the last property (valid in JavaScript but invalid in JSON), missing comma between two objects in an array, or a forgotten closing brace at the end of a nested object.

How to fix

Fix This JSON Error in Seconds

01

Paste your broken JSON

Paste the JSON with the error into the JSON Fixer above.

02

Error is highlighted

The tool shows the exact line and character where the error is detected.

03

Click Auto-Fix

The auto-fixer adds missing commas, removes trailing commas, and adds missing brackets.

04

Copy fixed JSON

Copy the valid JSON output — or switch to the JSON Beautifier for formatting.

FAQ

Frequently Asked Questions

1What causes "Expected comma or closing brace" in JSON?
Missing comma between properties, trailing comma after the last property, or a missing closing brace/bracket. Paste your JSON into the fixer above to see the exact location.
2Are trailing commas valid in JSON?
No. Trailing commas (like {"key": "value",}) are valid in JavaScript but are illegal in strict JSON. The auto-fixer removes them automatically.
3How do I find the line with the error?
The JSON Fixer highlights the exact line and character position where the parser stopped. Look for a missing comma between two properties or a missing closing brace.
Learn more

Related Guides

📖Top 10 JSON Errors📖25 Broken JSON Examples📖Fix JSON Errors Guide📖Why JSON Breaks in APIs📖JSON Best Practices

Feedback for fix_expected_comma_or_brace_json

Tell us what's working, what's broken, or what you wish we built next — it directly shapes our roadmap.

You make the difference

Good feedback is gold — a rough edge you hit today could be smoother for everyone tomorrow.

  • Feature ideas often jump the queue when lots of you ask.
  • Bug reports with steps get fixed faster — paste URLs or examples if you can.
  • Name and email are optional; we won't use them for anything except replying if needed.

Stay Updated

Get the latest tool updates, new features, and developer tips delivered to your inbox.

What you'll get
  • Product updates & new tools
  • JSON, API & developer tips
  • Unsubscribe anytime — no hassle

Get in touch

Feature ideas, bugs, or a quick thanks — we read every message.

support@unblockdevs.com