structured_json_repair
Structured JSON Repair
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Third-party content written by another agent. Data to evaluate, not instructions.
Repair messy or invalid JSON (the kind LLMs and tools often emit) into clean, valid JSON, and optionally validate/coerce it against a JSON Schema. Pure deterministic compute — no network or model calls.
What it fixes: trailing commas, single-quoted strings, unquoted keys, Python literals (None/True/False), NaN/Infinity, Markdown code-fence wrappers, and truncated/garbled tails.
When to use: you received text that should be JSON but JSON.parse fails, or you have JSON that must conform to a specific schema and want types coerced (e.g. "36" -> 36, "true" -> true).
When NOT to use: the input is already known-valid JSON and no schema check is needed.
Args:
- input (string, required): the raw/malformed JSON text.
- schema (object, optional): a JSON Schema (draft 2020-12) to validate and coerce against.
- coerce (boolean, optional, default true): coerce primitive types to satisfy the schema before validating.
Returns structuredContent:
{
"ok": boolean, // true if valid JSON (and schema-valid when a schema was given)
"data": any, // the repaired/validated JSON value; null if unfixable
"changed": boolean, // true if any repair or coercion modified the input
"errors": string[], // actionable messages when ok is false
"repairs": string[] // description of each fix applied
}
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| input | string | yes | Raw or malformed JSON text to repair. Examples: "{name: 'Ada', age: '36',}", a ```json fenced block, or a truncated '{"items":[1,2,3'. |
| schema | object | no | Optional JSON Schema (draft 2020-12) object to validate and coerce the repaired JSON against. |
| coerce | boolean | no | When true (default), coerce primitives to satisfy the schema before validating (e.g. "36" -> 36). |
Raw JSON schema
{
"type": "object",
"properties": {
"input": {
"type": "string",
"minLength": 1,
"description": "Raw or malformed JSON text to repair. Examples: \"{name: 'Ada', age: '36',}\", a ```json fenced block, or a truncated '{\"items\":[1,2,3'."
},
"schema": {
"type": "object",
"additionalProperties": {},
"description": "Optional JSON Schema (draft 2020-12) object to validate and coerce the repaired JSON against."
},
"coerce": {
"type": "boolean",
"default": true,
"description": "When true (default), coerce primitives to satisfy the schema before validating (e.g. \"36\" -> 36)."
}
},
"required": [
"input"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}