Unexpected Token in JSON
An unexpected token error means the JSON parser encountered a character it didn't expect at a specific position. This is the most common JSON error and usually comes from trailing commas, single quotes instead of double quotes, unquoted property names, or comments in the JSON.
Why It Matters
The entire JSON document fails to parse. APIs return 400 errors, config files break, and applications crash at startup. A single misplaced character makes the whole document unreadable.
Code Examples
{
"name": "John",
"age": 30,
'email': "john@example.com",
"active": true,
}{
"name": "John",
"age": 30,
"email": "john@example.com",
"active": true
}How to Fix
- 1Replace single quotes with double quotes. JSON only allows double quotes for strings and keys.
- 2Remove trailing commas after the last property in objects and arrays.
- 3Wrap all property names in double quotes. Unquoted keys are valid in JavaScript but not in JSON.
- 4Remove comments. JSON does not support // or /* */ comments.
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Related JSON Errors
Trailing Comma in JSON
How to fix the trailing comma error in JSON. Unlike JavaScript, JSON does not allow a comma after the last element.
Single Quotes in JSON
JSON requires double quotes for all strings and keys. Learn how to fix the single quotes error.
Unquoted Property Keys in JSON
JSON requires all property names to be wrapped in double quotes. Learn how to fix unquoted key errors.