Online Tool Store
Feature Flag JSON Builder
Add feature flag names, default states, and rollout percentages to generate a ready-to-use feature flag configuration JSON. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Example
Feature Flag JSON Builder
Sample: 2 flags
Example shown — replace it with your own flag names and rollout.
Result
{
"new-checkout-flow": { "enabled": true, "rollout": 25 },
"dark-mode-toggle": { "enabled": false, "rollout": 0 }
} How it works
- Add each feature flag name.
- Set its default enabled state and rollout percentage.
- Copy the generated JSON into your config.
The method
Each flag is written as a JSON object with enabled and rollout keys, a shape common enough to drop into most feature flag systems with minimal changes.
FAQ
What does the generated JSON look like?
Each flag becomes a key with "enabled" and "rollout" properties, a common shape used by many feature flag systems and easy to adapt to your own.
Can I set a rollout percentage per flag?
Yes — each flag gets its own enabled state and rollout percentage, independent of the others.
Does this connect to my feature flag service?
No — this generates a static JSON config you can copy into your own system; it doesn't call any external service.
How we compare
| Feature | Online Tool Store | Hand-writing the JSON | Full feature flag platform |
|---|---|---|---|
| No software install | Yes | Yes | No |
| Quick to start | Yes | Slower, error-prone | Setup required |
| Free to use | Yes | Free | Often paid |
For a quick starter config before wiring up a full platform, this saves hand-writing the JSON structure.