# JSON Schema Validator - Bulk JSON Draft 7, 2019-09, 2020-12 (`tidybytetools/json-schema-validator`) Actor

Check JSON documents against a JSON Schema (Draft 7, 2019-09 or 2020-12). Get a clear pass or fail, the error path and a plain message. Offline, no API key. $0.001 per document checked. Works from Apify MCP and the API.

- **URL**: https://apify.com/tidybytetools/json-schema-validator.md
- **Developed by:** [Tidy Byte Tools](https://apify.com/tidybytetools) (community)
- **Categories:** Developer tools, AI
- **Features:** Limited permissions
- **Stats:** 2 total users, 1 monthly users, 100.0% runs succeeded, 0 bookmarks
- **User rating**: No ratings yet

## Pricing

from $1.00 / 1,000 document validateds

This Actor is paid per event. You are not charged for the Apify platform usage, but only a fixed price for specific events.

Learn more: https://docs.apify.com/actors/running/actors-in-store.md#pay-per-event

## What's an Apify Actor?

An Actor is a serverless cloud program that runs on the Apify platform. It has two run modes.
In Batch mode, an Actor accepts a well-defined JSON input, performs an action which can take anything from a few seconds to a few hours,
and optionally produces a well-defined JSON output, datasets with results, or files in key-value store.
In Standby mode, an Actor provides a web server which can be used as a website, API, or an MCP server.

Apify vocabulary and the platform model are defined once, in the agent quickstart at https://apify.com/agents.md.

## How to integrate an Actor?

If asked about integration, you help developers integrate Actors into their projects.
You adapt to their stack and deliver integrations that are safe, well-documented, and production-ready.

Do not guess an integration path. Every one of them is in the agent quickstart at https://apify.com/agents.md: the Apify MCP server, Agent Skills with the Apify CLI, the JavaScript and Python clients, the REST API, and the account-free path for an agent with no human to sign in. It also carries the rule on stating cost before the first paid run.

For examples already wired to this Actor's own input schema, see the [API](#api) section below.

Each client library has reference documentation the quickstart does not restate: [JavaScript/TypeScript](https://docs.apify.com/api/client/js/docs.md) (`npm install apify-client`) and [Python](https://docs.apify.com/api/client/python/docs.md) (`pip install apify-client`).

# README

## JSON Schema Validator - Bulk JSON Draft 7, 2019-09, 2020-12

Check JSON documents against a JSON Schema (Draft 7, 2019-09 or 2020-12). Get a clear pass or fail, the error path and a plain message. Offline, no API key. $0.001 per document checked. Works from Apify MCP and the API.

Also searched as: ES: validar JSON Schema / PT: validar JSON Schema / DE: JSON Schema validieren / FR: valider un schéma JSON / JA: JSON Schema検証

### Website and local versions

- **[Website](https://tidybytetools.github.io/)** — Tidy Byte Tools product page

### What it does

- Checks one or many JSON documents against a schema you paste or load from a link.
- Accepts one JSON value, a JSON array, or JSON Lines.
- Tells you if each document passed, and if not, the field path and a plain error message.
- Supports Draft 7, 2019-09 and 2020-12, or reads the draft from `$schema`.
- Works offline. No API key is needed.

### Price

You pay **$0.001** per document checked, whether it passed or failed. If the schema itself is not valid, we stop and do not charge for documents. There is no start fee from us. Apify adds its normal small platform cost.
Set a max cost for the run and we stop there. We never charge for work we did not save.

### How to use

1. Paste a JSON Schema, or add a schema file link.
2. Paste JSON documents or add file links.
3. Click **Start**, or call this Actor from Apify MCP or the API.
4. Get one result row per document in the **Output** tab.

### Input

- **JSON Schema**: Paste the schema.
- **Or a schema file link**: Used if you do not paste a schema.
- **JSON documents**: One JSON value, a JSON array of values, or JSON Lines.
- **Document file links**: Links to JSON or JSON Lines files.
- **Schema draft**: Auto, Draft 7, 2019-09, or 2020-12.

### Example (before and after)

Before: a JSON Schema and one or more JSON documents (or JSON Lines). After: one row per document with a clear pass or fail, the error path, and a plain message. A bad schema fails the run and is not charged.

### Good to know

- This checks structure and types in the schema. It is not a live test of a website or API.
- Format checks such as `email` and `date-time` use the usual JSON Schema format rules.
- We report up to 50 errors per document. The error count still shows the full number.
- Files up to 50 MB each.
- Your data is only used for your run.
- Made by Tidy Byte Tools. Questions? Open an issue on this Actor's page.

### More tools from Tidy Byte Tools

These Actors work well together:

- [PDF Table Extractor](https://apify.com/tidybytetools/pdf-table-pull) — PDF tables to CSV, Excel and JSON. $0.003 per page with a table.
- [PDF, Word and Web Page to Markdown](https://apify.com/tidybytetools/doc-to-markdown) — Clean Markdown and RAG chunks. $0.003 per file.
- [HTML Table Extractor](https://apify.com/tidybytetools/html-table-extractor) — Web tables to CSV and JSON. $0.0005 per data row.
- [Broken Link Checker](https://apify.com/tidybytetools/broken-link-checker) — Check site and sitemap links. $0.001 per link.
- [Markdown Chunker for RAG](https://apify.com/tidybytetools/markdown-rag-chunker) — Split Markdown by headings. $0.0001 per chunk.
- [CSV and Excel Data Cleaner](https://apify.com/tidybytetools/csv-excel-data-cleaner) — Dedupe and fix dates, emails and phones. $0.0005 per clean row.
- [JSON to CSV Converter](https://apify.com/tidybytetools/json-to-csv-flattener) — Flatten nested JSON for spreadsheets. $0.0001 per row.
- [CSV Encoding Fixer and Splitter](https://apify.com/tidybytetools/csv-encoding-fixer-splitter) — Fix garbled letters like é and split big files. $0.01 per file.
- [Phone Number Validator](https://apify.com/tidybytetools/phone-number-validator-formatter) — Check and format numbers offline. $0.001 per number.
- [LLM Token Counter](https://apify.com/tidybytetools/llm-token-counter) — Offline token and cost estimates for GPT, Claude and Gemini. $0.0005 per unique text.

Free local tools (no Apify account needed): [pdf-table-pull-lite](https://github.com/tidybytetools/pdf-table-pull-lite), [doc2md-lite](https://github.com/tidybytetools/doc2md-lite), [link-check-lite](https://github.com/tidybytetools/link-check-lite), [md-chunk-lite](https://github.com/tidybytetools/md-chunk-lite), [json-shaper-lite](https://github.com/tidybytetools/json-shaper-lite).

Website: <https://tidybytetools.github.io>. All Actors: [apify.com/tidybytetools](https://apify.com/tidybytetools).

# Actor input Schema

## `schemaText` (type: `string`):

Paste the JSON Schema to check against. Use with the documents below, or with file links.

## `schemaUrl` (type: `string`):

Link to a JSON Schema file. Used if you do not paste a schema above.

## `documentsText` (type: `string`):

Paste one JSON value, a JSON array of values, or JSON Lines (one JSON value per line).

## `fileUrls` (type: `array`):

Links to JSON or JSON Lines files. Each file may hold one value, an array, or JSON Lines.

## `draft` (type: `string`):

Which JSON Schema draft to use.

## Actor input object example

```json
{
  "schemaText": "{\n  \"type\": \"object\",\n  \"properties\": {\n    \"name\": { \"type\": \"string\" },\n    \"age\": { \"type\": \"integer\", \"minimum\": 0 }\n  },\n  \"required\": [\"name\"]\n}",
  "documentsText": "{\"name\": \"Ann\", \"age\": 32}\n{\"name\": \"Bob\", \"age\": -2}\n{\"age\": 10}",
  "draft": "auto"
}
```

# Actor output Schema

## `results` (type: `string`):

No description

## `summary` (type: `string`):

No description

# API

You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup.

## JavaScript example

```javascript
import { ApifyClient } from 'apify-client';

// Initialize the ApifyClient with your Apify API token
// Replace the '<YOUR_API_TOKEN>' with your token
const client = new ApifyClient({
    token: '<YOUR_API_TOKEN>',
});

// Prepare Actor input
const input = {
    "schemaText": `{
  "type": "object",
  "properties": {
    "name": { "type": "string" },
    "age": { "type": "integer", "minimum": 0 }
  },
  "required": ["name"]
}`,
    "documentsText": `{"name": "Ann", "age": 32}
{"name": "Bob", "age": -2}
{"age": 10}`
};

// Run the Actor and wait for it to finish
const run = await client.actor("tidybytetools/json-schema-validator").call(input);

// Fetch and print Actor results from the run's dataset (if any)
console.log('Results from dataset');
console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`);
const { items } = await client.dataset(run.defaultDatasetId).listItems();
items.forEach((item) => {
    console.dir(item);
});

// 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docs

```

## Python example

```python
from apify_client import ApifyClient

# Initialize the ApifyClient with your Apify API token
# Replace '<YOUR_API_TOKEN>' with your token.
client = ApifyClient("<YOUR_API_TOKEN>")

# Prepare the Actor input
run_input = {
    "schemaText": """{
  \"type\": \"object\",
  \"properties\": {
    \"name\": { \"type\": \"string\" },
    \"age\": { \"type\": \"integer\", \"minimum\": 0 }
  },
  \"required\": [\"name\"]
}""",
    "documentsText": """{\"name\": \"Ann\", \"age\": 32}
{\"name\": \"Bob\", \"age\": -2}
{\"age\": 10}""",
}

# Run the Actor and wait for it to finish
run = client.actor("tidybytetools/json-schema-validator").call(run_input=run_input)

# Fetch and print Actor results from the run's dataset (if there are any)
print(f"💾 Check your data here: https://console.apify.com/storage/datasets/{run.default_dataset_id}")
for item in client.dataset(run.default_dataset_id).iterate_items():
    print(item)

# 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start

```

## CLI example

```bash
echo '{
  "schemaText": "{\\n  \\"type\\": \\"object\\",\\n  \\"properties\\": {\\n    \\"name\\": { \\"type\\": \\"string\\" },\\n    \\"age\\": { \\"type\\": \\"integer\\", \\"minimum\\": 0 }\\n  },\\n  \\"required\\": [\\"name\\"]\\n}",
  "documentsText": "{\\"name\\": \\"Ann\\", \\"age\\": 32}\\n{\\"name\\": \\"Bob\\", \\"age\\": -2}\\n{\\"age\\": 10}"
}' |
apify call tidybytetools/json-schema-validator --silent --output-dataset

```

## MCP server setup

```json
{
    "mcpServers": {
        "apify": {
            "type": "http",
            "url": "https://mcp.apify.com/?tools=fetch-actor-details,tidybytetools/json-schema-validator"
        }
    }
}
```

The hosted server signs you in with OAuth on first connect, so no API token belongs in this config. Clients without OAuth support can send an `Authorization: Bearer <APIFY_API_TOKEN>` header instead, using a token from API & Integrations in Apify Console (https://console.apify.com/settings/integrations).

## OpenAPI specification

Download the OpenAPI definition: https://api.apify.com/v2/actors/XjM1LvOXb8ZvSx57U/builds/cXb2bwudHDWzbL4g5/openapi.json