---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: malformedOptions.js
---
# Input
```jsx

```

# Diagnostics
```
malformedOptions.options:9:24 deserialize ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × filenameCases has an incorrect type, expected an array, but received a string.
  
     7 │ 					"level": "error",
     8 │ 					"options": {
   > 9 │ 						"filenameCases": "camelCase"
       │ 						                 ^^^^^^^^^^^
    10 │ 					}
    11 │ 				}
  

```