Tanod Util

utilpeek: validate JSON against a JSON Schema

validate_json

Read-onlyIdempotent

utilpeek: Validate JSON against a JSON Schema. Returns whether a JSON value is valid against a JSON Schema (draft from $schema, default 2020-12; 2019-09, 7, 6, 4 and 3 recognised), with up to 100 errors (instance path, schema path, message, validator) and the formats checked. Remote $ref documents are refused (422 remote_ref_forbidden), never fetched. Input: instance and schema; together at most 1 MB. An invalid schema is a 422 invalid_schema. Parsed in an isolated, resource-limited child process without network; input over its limits is a 422 (not charged). Typically under 0.5 s. Price: USD 0.001. Free: 10 utilpeek calls per IP per UTC day. Tanod does not log or store the submitted text; it is processed in memory for this answer. Docs: https://tanod.dev/learn/json-schema-validation-api.html

Input Schema

TableJSON Schema

Name	Required	Description	Default
`schema`	Yes	JSON Schema (draft from $schema; default 2020-12). Remote $ref documents are refused, never fetched.
`instance`	Yes	Any JSON value to validate.

Output Schema

TableJSON Schema

Name	Required	Description
`note`	No
`draft`	No
`error`	No	Only on an error result: an object {code, message}, or the reason string of an x402 PaymentRequired object.
`valid`	No
`errors`	No
`source`	No
`truncated`	No
`error_count`	No
`formats_checked`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 9, 2026

addedInput schema / properties / instance / type

Added value: +[
+  "object",
+  "array",
+  "string",
+  "number",
+  "integer",
+  "boolean",
+  "null"
+]

Changed1 schema field changedOct 8, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "draft": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "error": {
+      "description": "Only on an error result: an object {code, message}, or the reason string of an x402 PaymentRequired object."
+    },
+    "error_count": {
+      "type": [
+        "integer",
+        "null"
+      ]
+    },
+    "errors": {
+      "items": {
+        "properties": {
+          "message": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "path": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "schema_path": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "validator": {
+            "type": [
+              "string",
+              "null"
+            ]
+          }
+        },
+        "type": [
+          "object",
+          "null"
+        ]
+      },
+      "type": [
+        "array",
+        "null"
+      ]
+    },
+    "formats_checked": {
+      "items": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "type": [
+        "array",
+        "null"
+      ]
+    },
+    "note": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "source": {
+      "properties": {
+        "library": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "license": {
+          "type": [
+            "string",
+            "null"
+          ]
+        }
+      },
+      "type": [
+        "object",
+        "null"
+      ]
+    },
+    "truncated": {
+      "type": [
+        "boolean",
+        "null"
+      ]
+    },
+    "valid": {
+      "type": [
+        "boolean",
+        "null"
+      ]
+    }
+  },
+  "type": "object"
+}

First observedOct 8, 2026

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