Broken JSON Repair & Fixer

AI & LLM JSON Healer

Automatically fix broken, malformed, or truncated JSON from ChatGPT, Claude, and APIs.

Malformed JSON

Sample:

Healed & Valid JSON

Fixes (1):Removed Markdown codeblock wrapper (```json ... ```)

{
  "status": "processing",
  "model": "gpt-4o",
  "results": [
    {
      "id": 1,
      "title": "Quantum Computing",
      "tags": [
        "physics",
        "hardware"
      ]
    }
  ]
}

Broken JSON Repair & Fixer Online - Heal Malformed AI & LLM JSON

Automatically fix and repair broken, malformed, or truncated JSON generated by ChatGPT, Claude, and local LLMs directly inside your browser.

Handles missing closing brackets and braces, removes trailing commas, converts Python True/False/None to valid JSON, quotes raw identifiers, and strips Markdown code blocks in real time.

{}

Why Use PlayWithJSON?

Auto-balances unclosed braces and brackets from truncated AI outputs
Converts single quotes into compliant double quotes
Removes invalid trailing commas from objects and arrays
Normalizes Python True, False, and None into true, false, and null
100% private, client-side execution with zero server transmission

Key Features of Broken JSON Repair

Bracket & Brace Balancing

Automatically detects and closes unclosed curly braces and square brackets in the proper nested order.

Quote Normalization

Converts single-quoted keys and values into valid standard double quotes while preserving internal apostrophes.

Python Literal Coercion

Translates Python dictionary literals (True, False, None, NaN) into RFC-compliant JSON primitives.

Markdown Code Block Stripping

Strips markdown code fences (```json ... ```) automatically when copying responses from ChatGPT.

Comment & Comma Cleaning

Eliminates illegal trailing commas and strips single-line and multi-line comments.

Instant Copy & Export

Copy the healed, beautified JSON immediately or download it as a clean repaired.json file.

How to Fix Broken JSON Online

Paste Malformed JSON

Paste the broken or truncated JSON snippet into the left editor panel.

Automatic Repair

The healer instantly balances braces, quotes keys, removes trailing commas, and fixes literals.

Review Applied Fixes

Check the list of repaired issues shown in the status pill badge.

Copy or Download

Copy the valid, formatted JSON output to your clipboard or download the file.

Broken JSON Repair Example

Malformed Input (Truncated + Single Quotes + Python)

{ 'user_id': 101, 'is_admin': True, 'tags': ['developer', 'ai',

Repaired Output (Valid JSON)

2 "user_id": 101,

3 "is_admin": true,

4 "tags": [

5 "developer",

6 "ai"

7 ]

Supported Repair Heuristics

Broken JSON

2 name: 'PlayWithJSON',

3 active: True,

Syntax error: unquoted key, single quotes, Python True, and trailing comma

Repaired JSON

2 "name": "PlayWithJSON",

3 "active": true

Supported Repair Rules

Unclosed braces balancing (EOF auto-close)

Unquoted key identifier quoting

Single quotes to double quotes replacement

Trailing commas removal before closing brackets

Python True, False, None to true, false, null

Markdown fence stripping (```json)

Empty property colon null filling

Comment stripping (// and /* */)

Real-time repair badges and changelog

100% private in-browser processing

Frequently Asked Questions

Frequently Asked Questions about JSON Repair

Large language models frequently hit output token limits resulting in truncated responses with unclosed braces. They also occasionally use single quotes or Python boolean keywords (True/False) instead of strict JSON specification syntax.

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Broken JSON Repair

Automatically heal broken and truncated AI/LLM JSON