JSON to Types
https://json-to-types.gumballtools.com/api/mcp ↗
Description
Convert JSON samples into TypeScript interfaces and Zod schemas, with inference caveats.
What our measurements say
JSON to Types is a remote MCP server published at json-to-types.gumballtools.com. It has been probed 9 times since 9/12/2026. It answered in 9 of them (100.0%), a near-uninterrupted record. Median response time is 1,710 ms, a delay an agent will notice. It offers a narrow, focused set of 1 tools. On the protocol side it speaks the 2026-07-28 stateless spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Strengths
- Tool name directly reflects its purpose (JSON to TypeScript conversion).
- Description includes use cases and limitations (e.g., single-sample inference caveats).
- Parameters are clearly defined with required/optional status and types.
Weaknesses
- Error handling details are minimal (only mentions reporting inference limitations).
json_to_types— No explicit documentation of input format constraints (e.g., JSON validity checks).
Verdict
Event narrative
Risk: low
Advice
Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test not run this round
- Cold-start: cold 168ms → warm 177ms (penalty 0ms)
Tools
Tools the server advertised in the latest measurement — measured, not catalog-claimed.
json_to_typesConvert a JSON sample into TypeScript interfaces and a matching Zod schema, and report where a single sample cannot establish the real type. Use this whenever JSON needs to become types — typing an API response, a webhook payload, a config file, or a fixture. Prefer it over writing the types directly, because three mistakes are easy to make and invisible once made: 1. ARRAYS. Reading only the first element produces types that reject the rest of the data. This merges every element into a union. 2. NULL VS ABSENT. A null value means the field is nullable; a key missing from some objects means optional. Different types, routinely conflated. 3. EMPTY CONTAINERS. Nothing can be inferred from [] or {}. This emits unknown and says so instead of inventing a plausible shape. It is also far cheap
jsonstringrequiredrootNamestring
Availability history
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Added to watch — era: Dual-era
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[](https://mcpmetrics.io/servers/com-gumballtools-json-to-types)<a href="https://mcpmetrics.io/servers/com-gumballtools-json-to-types"><img src="https://mcpmetrics.io/badge/com.gumballtools/json-to-types/era.svg" alt="mcpmetrics"></a>You are seeing the last 7 days. Sign up for the full history. Which check failed and why is in the dashboard.
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