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ValidateHTML

Single Quotes in JSON

JSON requires all strings and property names to be wrapped in double quotes. Single quotes, backticks, or unquoted strings are not valid JSON. This rule exists because JSON is a strict data interchange format, not a programming language.

Why It Matters

Any JSON with single quotes will fail to parse in every standard JSON parser. APIs reject the payload, configuration files fail to load, and data exchanges break.

Code Examples

Invalid JSON
{
  'name': 'John',
  'city': 'New York',
  'active': true
}
Valid JSON
{
  "name": "John",
  "city": "New York",
  "active": true
}

How to Fix

  • 1Replace all single quotes with double quotes for both keys and string values.
  • 2If your string contains double quotes, escape them with a backslash: \".
  • 3Do not use backticks or template literals. They are not valid in JSON.
  • 4Use a find-and-replace to quickly swap single quotes to double quotes in your editor.

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Related JSON Errors

Unexpected Token in JSON

Learn why JSON throws an unexpected token error and how to fix it. Common causes include trailing commas, single quotes, and unquoted keys.

Unquoted Property Keys in JSON

JSON requires all property names to be wrapped in double quotes. Learn how to fix unquoted key errors.

Invalid Escape Characters in JSON

Learn which escape sequences are valid in JSON strings and how to fix invalid ones.

View all JSON errors