10 Common JSON Errors and How to Fix Them

1. Trailing Commas

JSON does not allow trailing commas after the last item in an array or object. This is a common habit from JavaScript developers.

// WRONG: { "a": 1, }

2. Single Quotes

In JSON, all strings and keys MUST be wrapped in double quotes. Single quotes will cause a syntax error.

// WRONG: { 'name': 'John' }

3. Unquoted Keys

Unlike JavaScript objects, JSON keys must always be quoted.

// WRONG: { name: "John" }

4. Missing Commas

Every key-value pair must be separated by a comma.

5. Mismatched Brackets

Ensure every { has a } and every [ has a ].

Use our JSON Validator to catch these errors automatically and fix them with one click!