Infer a draft-07 JSON Schema from sample JSON document(s)
Infer a draft-07 JSON Schema from sample JSON document(s). Send one sample as json, or several as samples. Heuristic merge rules: required = keys present in every sample, conflicting types become a type union, integer widens to number, and string formats (date-time, date, email, uri, uuid) are detected from values. Complements json-validate.
Not tested: has real-world effectsour last check, 2026-09-24
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Endpoint
POST https://agent402.tools/api/json-schema-infer
| Category | Code and developer |
|---|---|
| Provider host | agent402.tools |
| Networks | algorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73ktiC1qzkkit8=, eip155:10, eip155:1329, eip155:137, eip155:143, eip155:42161, eip155:42220, eip155:43114, eip155:4663, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp, stellar:pubnet |
| Payment schemes | exact, upto |
| Self-reported calls, 30 days | 5 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
We never call tools that send, buy, move money or file anything, not even without paying.
Example input (from the provider)
{
"body": {
"json": {
"active": true,
"age": 36,
"joined": "1843-10-18",
"name": "Ada",
"tags": [
"pioneer"
]
}
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"json": {
"description": "a sample JSON document (object or JSON string)"
},
"samples": {
"description": "alternative: 1-50 sample documents merged into one schema",
"type": "array"
}
}
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"samples": {
"type": "integer"
},
"schema": {
"properties": {
"$schema": {
"type": "string"
},
"properties": {
"properties": {
"age": {
"properties": {
"type": {
"type": "string"
}
},
"type": "object"
},
"name": {
"properties": {
"type": {
"type": "string"
}
},
"type": "object"
}
},
"type": "object"
},
"required": {
"items": {
"type": "string"
},
"type": "array"
},
"type": {
"type": "string"
}
},
"type": "object"
}
},
"required": [
"schema",
"samples"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}