Pricing

from $1.50 / 1,000 document-validateds

Try for free

Go to Apify Store

LLM Output Validator: JSON Schema + Repair Hints

Try for free

Validate LLM/tool-call JSON output against a JSON Schema (draft-07 or 2020-12) — get machine-readable error paths, concrete repair hints per error, and optional deterministic normalization/repair.

Pricing

from $1.50 / 1,000 document-validateds

Rating

0.0

(0)

Developer

Dennis

Actor stats

Bookmarked

Total users

Monthly active users

20 days ago

Last modified

Categories

Developer tools

Other

You can access the LLM Output Validator: JSON Schema + Repair Hints programmatically from your own applications by using the Apify API. You can also choose the language preference from below. To use the Apify API, you’ll need an Apify account and your API token, found in API & Integrations in Apify Console.

Python

JavaScript

CLI

OpenAPI

HTTP

MCP

1from apify_client import ApifyClient
2
3# Initialize the ApifyClient with your Apify API token
4# Replace '<YOUR_API_TOKEN>' with your token.
5client = ApifyClient("<YOUR_API_TOKEN>")
6
7# Prepare the Actor input
8run_input = {
9    "documents": ["{\"name\": \"Alice\", \"age\": 30, \"email\": \"alice@example.com\"}"],
10    "schema": {
11        "type": "object",
12        "properties": {
13            "name": { "type": "string" },
14            "age": {
15                "type": "integer",
16                "minimum": 0,
17            },
18            "email": {
19                "type": "string",
20                "format": "email",
21            },
22        },
23        "required": [
24            "name",
25            "age",
26            "email",
27        ],
28        "additionalProperties": False,
29    },
30}
31
32# Run the Actor and wait for it to finish
33run = client.actor("codeclouds/llm-output-validator").call(run_input=run_input)
34
35# Fetch and print Actor results from the run's dataset (if there are any)
36print(f"💾 Check your data here: https://console.apify.com/storage/datasets/{run.default_dataset_id}")
37for item in client.dataset(run.default_dataset_id).iterate_items():
38    print(item)
39
40# 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start

LLM Output Validator — JSON Schema + Repair Hints API in Python

The Apify API client for Python is the official library that allows you to use LLM Output Validator: JSON Schema + Repair Hints API in Python, providing convenience functions and automatic retries on errors.

Install the apify-client

$pip install apify-client

Other API clients include:

LLM Output Validator: JSON Schema + Repair Hints API in JavaScript

LLM Output Validator: JSON Schema + Repair Hints API through CLI

LLM Output Validator: JSON Schema + Repair Hints OpenAPI definition

LLM Output Validator: JSON Schema + Repair Hints API

Function Call JSON Repair

junipr/function-call-json-repair

Repair malformed JSON function-call arguments and tool outputs using safe deterministic fixes, validate against schemas, and emit repair diagnostics with before/after records.

junipr

JSON Schema Validator for AI Agents | validate_json_schema

scryptex_labs/validate-json-schema

Agent-ready: JSON string + optional schema in → valid/repair/errors with agentHints out. USE WHEN: pipeline validation, LLM output repair, tool chaining. MCP twin at scryptexlabs.com.

Paweł Józefowski

Agent Output Cleaner

yauponlabs/structured-output-cleaner

Fix messy LLM and agent outputs into clean, machine-usable JSON. Repair common structured-output breakage, return a repair report, and fail honestly on ambiguous cases.

Brian Rodriguez

FlowMint JSON Repair

yummy_cormorant/flowmint

Repair malformed JSON into valid JSON. Returns the repaired JSON text, parsed value, and a changed flag. Designed for reliable automated workflows with no LLM, proxy, or external API keys required.

Taras

US Auto Repair Directory — Car Repair Shops Scraper

straightforward_hydra/us-auto-repair-directory

Extract auto repair shops in any US state: name, address, phone, website, hours & GPS. Clean B2B lead list from OpenStreetMap. No key.

Dev D

JSONL Stream Validator

stellar_ballet_0bu/jsonl-stream-validator

Validate a stream of JSONL/NDJSON records against a JSON Schema (draft-07 subset) one line at a time. Per-record error rows, drop-or-tag policy, summary by error type. Pairs with json-schema-validator + jsonl-to-csv.

Nikita S

JSON Schema Inferer - Draft-07 Schema from JSON or API URL

eliai/json-schema-inferer

Infer a draft-07 JSON Schema from any JSON URL or raw sample: types, required fields, email/date-time/uuid/uri formats, small enums, merged array-item schemas. $0.002 per schema, no start fee, non-JSON never charged — vs $0.011+ measured incumbents. Validate APIs and LLM output fast.

Broke to Built

JSON Repair, Normalize & Schema Checker

dravara/json-medic

Paste broken JSON, JSONL, or a fenced model response. Repair syntax, normalize keys, coerce safe primitives, and validate a bounded schema subset without AI. Run the prefilled example.

Dravara LLC

LLM Output Guard | JSON Schema Validation for Agent Output

broomwagon/llm-output-guard

Check that your model's JSON matches the schema you asked for. Every failure comes back with its path, the keyword it broke, and the repair that would fix it. Shape repairs are opt-in and never invent content, so a repair can never hide a real failure.