Number has a leading zero

What it means

JSON does not allow leading zeros on numbers (e.g. 007). A single 0, or 0 followed by a decimal point, is fine — but 0 followed by more digits is not.

Example

{ "code": 0123 }

{ "code": 123 }

How to fix it

Remove the leading zero, or quote the value if you need to preserve it.

Validate your JSON to see this and every other issue highlighted in one pass.

Diagnostics on this page come from @jsonlint/core, the open-source engine that powers the JSONLint validator. Install it with npm install @jsonlint/core.