Formatho Jev Playground
Browser request builder for the System One API with mock and live modes, Python code generation and a Jev suitability test.
This summary is based on how curated lists describe the project; its README was not available to review.
Overview
Formatho's Jev Playground is a browser-based request builder for the System One API. According to the list summary, you compose a state plus typed Noul, Choice and Score questions; mock mode runs locally without an API key, while live mode uses your TypeSafe key and calls api.typesafe.ai directly from the browser. It generates equivalent typesafe_sdk Python code and includes a companion Jev Suitability Test.
It is a quick way to prototype questions and see response shapes before writing code. No source code was reviewed.
What the decision model decides
| Type | Question | Answers |
|---|---|---|
| Choice | User-composed Noul, Choice and Score questions(inferred) | — |
How it works
- Compose state and typed questions in the browser
- Run in mock mode or live with your key
- Inspect responses
- Copy generated Python code
Strengths
- No-install prototyping
- Mock mode without a key
- Code generation
Caveats
- List-only entry
- Live mode sends your key and data from the browser to TypeSafe
Getting started
Open https://formatho.com/tools/jev-playground.At a glance
- Type
- Service
- Status
- production
- Runtime
- browser tool
Use cases and integrations
How curated lists describe it
Browser-based request builder for the System One API: compose state plus typed Noul, Choice, and Score questions. Mock mode runs locally without an API key; Live mode requires your TypeSafe key and calls api.typesafe.ai directly. Generates typesafe_sdk Python. Includes companion Jev Suitability Test.
hellogumbo/awesome-jev
Frequently asked questions
Do I need a key?
Not for mock mode; live mode needs a TypeSafe key.
Does it generate code?
Yes, typesafe_sdk Python.
What is the suitability test?
A companion tool to check whether a task fits Jev, per the summary.
Related projects
Server behind api.typesafe.pro, a free anonymous System One-compatible endpoint that forwards to TypeSafe on the operator's key.
ServiceproductionBrowser form for building Jev requests from pasted text without hand-writing JSON, then rerunning to see how steady the answers are.
ProjectbetaJavaScriptTerminal REPL for shaping System One requests before writing code, with lessons, a sketch editor, conversation turns and offline simulation.
ServicebetaTypeScriptNushell module for TypeSafe's System One API: pipe content in, ask noul, choice and score questions, and filter on the numbers.
ServicebetaNushellOne-page playground and test bench for Jev with TypeSafe, OpenRouter, LLM-baseline and mock backends behind one /v1/systemone contract.
ServiceprototypeTypeScriptStatic browser interface for making structured Jev decisions through the Pollinations API, with multilingual READMEs.
ServiceprototypeJavaScript