Repair JSON and match it to a schema
Turn broken or wrapped JSON (typical language-model output) into valid JSON, list every repair, and optionally coerce and validate it against a JSON Schema.
Details
Repairs: Markdown code fences, text before or after the JSON, comments, trailing or missing commas, single or curly quotes, unquoted keys, Python True/False/None, NaN/Infinity, raw line breaks in strings, and output cut off mid-way.
With a schema: converts "42" to 42 or "yes" to true where the schema asks, fixes key case and enum case, wraps a single value in an array, can add defaults and drop unknown keys; then returns validation errors with paths.
Limits: text up to 1 MB. Schema keywords: type, properties, required, items, prefixItems, enum, const, ranges, lengths, pattern, format, anyOf/oneOf/allOf/not, $ref to $defs.
Price: CHF 0.002 per call (first 100 calls per day free).
Example: {"text":"Sure! ```json\n{name: 'Ada', age: '36',}\n```","schema":{"type":"object","properties":{"age":{"type":"integer"}}}} → {"data":{"name":"Ada","age":36},"valid":true}.
Call it
RESTcurl -X POST https://api.tausendwerk.xyz/v1/repair-json \
-H "Content-Type: application/json" \
-d '{"text":"Sure! ```json\n{name: 'Ada', age: '36',}\n```","schema":{"type":"object","properties":{"age":{"type":"integer"}}}}'repair_jsonAfter the free 100 calls per day, add a key: Authorization: Bearer tw_live_…. Pricing
Try it
Runs against the live API with the free allowance.
Input schema JSON Schema
{
"type": "object",
"additionalProperties": false,
"required": [
"text"
],
"properties": {
"text": {
"type": "string",
"maxLength": 1000000,
"description": "The broken JSON or model output."
},
"schema": {
"type": "object",
"description": "Optional JSON Schema to coerce and validate against."
},
"coerce": {
"type": "boolean",
"default": true,
"description": "Fix types toward the schema. Default true."
},
"apply_defaults": {
"type": "boolean",
"default": false,
"description": "Add missing properties that have a default."
},
"strip_unknown": {
"type": "boolean",
"default": false,
"description": "Drop keys the schema forbids (additionalProperties: false)."
}
},
"examples": [
{
"text": "Sure! ```json\n{name: 'Ada', age: '36',}\n```",
"schema": {
"type": "object",
"properties": {
"age": {
"type": "integer"
}
}
}
}
]
}