JSON Rules

Below the list of rules supported by Biome, divided by group. Here’s a legend of the emojis:

• The icon indicates that the rule is part of the recommended rules.
• The icon indicates that the rule provides a code action (fix) that is safe to apply.
• The icon indicates that the rule provides a code action (fix) that is unsafe to apply.
• The icon indicates that the rule has been implemented and scheduled for the next release.

suspicious

Rule name	Description	Properties
noBiomeFirstException	Prevents the use of the ! pattern in the first position of files.includes in the configuration file.
noDuplicateObjectKeys	Disallow two keys with the same name inside objects.
noQuickfixBiome	Disallow the use if quickfix.biome inside editor settings file.
useBiomeIgnoreFolder	Promotes the correct usage for ignoring folders in the configuration file.

Recommended rules

• noBiomeFirstException (Severity: error)
• noDuplicateObjectKeys (Severity: error)
• noQuickfixBiome (Severity: information)
• useBiomeIgnoreFolder (Severity: warning)