Introducing JSON Repair Tool: Automatically Fix Broken JSON in Your Browser

We just shipped a brand new tool in the JSON Work family: JSON Repair Tool.

When you copy JSON from logs, browsers, or third‑party tools, it’s often almost JSON – but not quite valid:

• • Missing commas between properties

• • JavaScript-style // comments and /* ... */

• • Single quotes instead of double quotes

• • Wrong boolean or null casing

• • A mix of all of the above in one payload

The JSON Repair Tool is built exactly for these situations.

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🔧 What JSON Repair Tool Does

The tool takes invalid JSON as input and tries to turn it into valid JSON step by step, while keeping everything:

• • In your browser – no data ever leaves your device

• • Deterministic – same broken input, same repaired output

• • Transparent – every repair step is listed so you know what was changed

Common Issues It Can Fix

Today, the JSON Repair Tool can handle:

• • Missing commas between object properties

- Example:

- Before:

{
        "name": "John",
        "age": 30
        "city": "New York"
      }

- After (fixed):

{
        "name": "John",
        "age": 30,
        "city": "New York"
      }

• • JavaScript-style comments

- Both // line comments and /* block comments */

• • Single-quoted strings

- Converts 'value' to "value" where it’s safe to do so

• • Unquoted keys

- Example: { name: "John" } → { "name": "John" }

• • Boolean / null casing

- Normalizes True / False / NULL / Null to lowercase JSON literals

If the JSON is already valid, the tool just reformats it nicely and tells you it was already valid.

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🧠 How the Repair Algorithm Works

Under the hood, the JSON Repair Tool runs a sequence of small, safe transformations, trying to parse the JSON after each step:

1. Whitespace & BOM cleanup

- Remove BOM

- Normalize line endings

1. Comment removal

- Strip //... and /* ... */

1. Insert missing commas between properties

- Looks for “value line” followed by a “key line” and auto‑inserts a comma

1. Remove trailing commas

- Cleans up invalid , } or , ]

1. Normalize boolean & null literals

1. Convert single quotes to double quotes

1. Quote unquoted object keys

After each transformation, we try to run JSON.parse.

As soon as parsing succeeds, we stop and pretty‑print the result with standard JSON formatting.

If we still can’t parse at the end, we:

• • Show the partially cleaned text (still useful for manual fixes)

• • Return a clear error message from the last JSON.parse attempt

• • Keep a step-by-step summary so you know what was already fixed

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🖥️ Using JSON Repair Tool in Your Workflow

You can open the tool at:

• • /tools/formatters/json-repair (or the localized version under your language)

Typical workflows where JSON Repair Tool shines:

1. Debugging API Responses

• • Copy a broken or prettified-but-invalid payload from browser devtools

• • Paste it into JSON Repair Tool

• • Get a valid JSON payload back for:

- Testing in other tools

- Feeding into formatters / validators

- Sharing with your team

2. Cleaning Up Logs

• • Logs often contain JSON‑ish fragments with comments or typos

• • Paste the content into the Repair Tool and let it:

- Strip comments

- Fix small syntax issues

- Make the JSON readable again

3. Working with Third-Party Tools

• • Some tools produce JSON‑like configs that aren’t strictly valid JSON

• • Use the Repair Tool to convert them into real JSON for:

- Schema validation

- Conversion to CSV / XML / YAML

- Static analysis or linting

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🔒 Privacy & Local Processing

Like the rest of JSON Work:

• • All processing is 100% local to your browser

• • No network requests are sent with your content

• • There is no server-side log of what you paste

This is especially important when:

• • You’re working with production payloads

• • Logs contain user data or secrets

• • You’re under strict compliance or privacy rules

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🌍 Deep Integration with JSON Work

JSON Repair Tool is designed to work smoothly with other tools on JSON Work:

• • JSON Validator – validate and analyze the repaired JSON

• • JSON Beautifier – further format or minify the result

• • JSON Tree Viewer – visually inspect the repaired structure

• • JSON Diff Tool – compare original vs repaired versions

You’ll also find JSON Repair Tool linked in:

• • The Formatters & Validators tools overview

• • Related tools section of compatible pages

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🚧 Limitations & Future Improvements

JSON Repair Tool focuses on safe, predictable fixes.

There are cases it won’t fix automatically, for example:

• • Structurally broken JSON with missing braces or brackets

• • Ambiguous content where multiple interpretations are possible

In these cases, the tool:

• • Gives you the cleaned-up best effort text

• • Provides the exact parse error message

• • Lists all repair steps already applied

Planned Improvements

In upcoming iterations, we’re exploring:

• • Optional more aggressive repair modes

• • Better detection of missing brackets / braces

• • More detailed diff views between original and repaired JSON

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✅ Try It Now

You can start using JSON Repair Tool today:

1. Open JSON Repair Tool

1. Paste any broken or invalid JSON

1. Let the tool repair it automatically

1. Copy or download the fixed result

1. Continue your workflow with Validator, Beautifier, or Tree Viewer

If you have ideas for additional repair rules or edge cases you’d like us to support, feel free to reach out — we’re building JSON Work specifically for developers like you.