Common JSON Syntax Errors and How to Fix Them

Even experienced developers make JSON mistakes. Here are the top errors we see and how to fix them.

1. "Expecting 'STRING', 'NUMBER', 'NULL', 'TRUE', 'FALSE', '{', '['"

This usually means you have a trailing comma or a missing value. Check the end of your arrays and objects.

2. "Unexpected token ' in JSON at position X"

You probably used single quotes. JSON strictly requires double quotes for keys and string values.

3. "Unexpected end of JSON input"

You likely forgot a closing brace } or bracket ]. Our Validator will highlight the imbalance.