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FastX402 TypeScript Type Inferrer
x402
FastX402 TypeScript Type Inferrer is a paid API for AI agents from fastx402.tools, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-27).
Infers TypeScript interface or type alias definitions from a JSON sample, including nested structures and array types.
Price / call$0.002
Success—
StatusUnknown
How this service works
216 pay-per-call tools for AI agents, from $0.001 per request in USDC on Base or Solana with x402. No account, no API key.
Output
Returns the inferred TypeScript type definition as a string, including the type name, output style used (interface or type alias), and the full TypeScript code with nested object types and array element types properly annotated.
Example use cases
Type-safe API response modeling
“I got this JSON back from a REST API and I need a TypeScript interface for it — can you infer the types? Here's the sample: {"orderId":"abc123","items":[{"sku":"XYZ","qty":2,"price":9.99}],"total":19.98,"shipped":false}. Name it OrderResponse.”
Auto-generate types for config object
“I have this config JSON and I want a TypeScript type alias (not an interface) called AppConfig so I can use it safely in my codebase: {"theme":"dark","maxRetries":3,"features":{"beta":true,"analytics":false}}.”
Nested JSON schema typing for data pipeline
“Here's a complex nested JSON from our data pipeline — can you generate a TypeScript interface called PipelineEvent with all nested structures and array types properly typed? {"eventId":"e1","timestamp":1700000000,"payload":{"source":"kafka","records":[{"key":"k1","value":42}]}}”
Technical details
Endpoint
GEThttps://fastx402.tools/typescript-infer?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to quickly bootstrap TypeScript type definitions from real JSON data — particularly useful when dealing with API responses, configuration objects, or data pipeline payloads where writing types by hand would be tedious. Prefer this over manual type authoring or LLM-generated types when you want a deterministic, structured output with proper nested and array type handling at very low cost ($0.002/call).
Side effects
- Invalid or malformed JSON input causes inference failure
- Empty JSON object results in minimal or trivial type output
- Deeply recursive or circular JSON structures may produce incomplete types
- Missing required 'json' query parameter returns an error
- Ambiguous union types in JSON arrays may default to a broad type like 'any' or 'unknown'
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"name": "User",
"style": "interface",
"typescript": "interface User {\n id: number;\n name: string;\n tags: string[];\n meta: {\n active: boolean;\n };\n}"
}
}Tags
x402
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