About
JSONing is a developer tool that provides a mock API for testing and prototyping. It can generate a custom API from a JSON object, define resources such as products and users, and apply JSON-based rules to customize HTTP status codes, headers, and response bodies.
The service includes a public read-only API with sample resources, plus documentation for routes, resource configuration, and rule configuration. The page also notes that APIs created online are deleted once a day, while a local installation can be downloaded from GitHub.
- Custom API generation from JSON objects
- JSON-based request rule engine
- Read-only public mock API
- Daily deletion of online APIs
- Local open-source installation option
- Documented CRUD routes for resources
Free Tier Value
This free tier appears to be a perpetual, uncapped offering: the page describes the tools and the public mock API as free and open source, with no paid plan or signup friction shown. Because there is no concrete quota, credit, or trial limit to price against, the practical monthly value is best treated as unbounded rather than estimated from a capped allowance.
What's included in the free tier
Verified
- Public read-only mock API is free to use.
- APIs created online are automatically deleted once per day.
- Local self-hosted installation available under the open-source license.
See JSONing pricing for current limits.
Common questions
Is JSONing free forever?
Yes. JSONing is free forever, with no time limit and no usage threshold that forces a paid plan.
Does JSONing require a credit card?
No. You can start on JSONing's free tier without entering card details.
What is JSONing's free tier worth?
JSONing's free tier has no dollar cap - it's unlimited, with no usage threshold that forces a paid plan. That maps to an FTV score of 99/100. The FTV score is explained at freetier.co/ftv.
