Webtility

Schema Infer

Infer a draft JSON schema from structured samples.

Infer JSON schema

JSON sample(s)

Samples parsed

Inferred schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "id": {
      "type": "integer"
    },
    "name": {
      "type": "string"
    },
    "tags": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "active": {
      "type": "boolean"
    }
  },
  "additionalProperties": false,
  "required": [
    "id",
    "name"
  ]
}

About this tool

Teams need schema baselines quickly when API contracts are undocumented.

How to use

Paste representative JSON examples.
Infer field types, required keys, and nested structures.
Review output schema and tighten constraints before production use.

FAQ

Can it infer optional fields?

Yes, optionality is derived from presence across sample sets.

Is inferred schema production-ready?

Treat it as a draft and apply stricter validation rules manually.

Does it support nested arrays?

Nested object and array structures are included in the draft output.