Code to JSON

What Does This Tool Do?

It accepts loosely-formatted, JSON-like data - unquoted object keys, single-quoted strings, trailing commas - and normalizes it into strict, standards-compliant JSON.

Why Use This Tool?

Data copied from JavaScript source code, a config file, or an AI-generated snippet often looks like JSON but isn't strictly valid - this tool fixes the common differences automatically instead of you editing every key and quote by hand.

How to Use It

1. Paste your loosely-formatted object/array data.
2. Click Convert.
3. Copy the resulting strict, valid JSON.

Limitations

This handles common non-strict JSON-like patterns - it is not a general JavaScript/PHP code interpreter, so values that require actual code execution (function calls, variables) won't convert.

Example

A JavaScript object literal copied from source code:

{
  name: 'Blue Mug',
  price: 249,
  tags: ['kitchen', 'gift',],
}

becomes strict JSON:

{
  "name": "Blue Mug",
  "price": 249,
  "tags": [
    "kitchen",
    "gift"
  ]
}

What Gets Fixed

• Unquoted keys get double quotes.
• Single-quoted strings become double-quoted.
• Trailing commas after the last item are removed.

What Cannot Be Converted

JSON is data only, so anything that needs code to run has no JSON equivalent: function values, undefined, new Date(), variables, template literals with ${...}, regular expressions and calculated values. Replace those with plain values before converting - dates, for example, as ISO strings like "2026-09-20".

Where This Helps

• Turning a JavaScript config or mock object into a JSON fixture for tests or an API.
• Fixing "JSON" produced by an AI assistant or copied from documentation.
• Moving settings from a JS config file into package.json or a JSON config.

Check the result with the JSON Validator. Going the other way? Use JSON to JavaScript.