Feature Flag JSON Builder
Enter a flag name, default value, and rollout percentage to create portable JSON.
A QUICK WALKTHROUGH
How to use this tool
- Enter a name beginning with a letter.
- Choose the default boolean and a whole rollout percentage from 0 to 100.
- Build and copy the JSON output.
Portable definition
Output includes name, defaultValue, and rolloutPercentage fields.
Validation
Names allow letters, numbers, dots, underscores, and hyphens after an initial letter; rollout is an integer from 0 to 100.
No remote service
This tool only creates JSON locally and never connects to a feature-flag provider.
GOOD TO KNOW
Common questions
Does it publish a flag?
No. It generates JSON only.
What names are allowed?
Start with a letter, then use letters, numbers, dots, underscores, or hyphens, up to 64 characters.
Can rollout be fractional?
No. Use a whole percentage from 0 through 100.