# Mock data generator

- Human page: https://happytails.ai/en/api/tools/mock-data-generator/
- Markdown: https://happytails.ai/en/api/tools/mock-data-generator.md
- Structured JSON: https://happytails.ai/agents/en/api/tools/mock-data-generator/index.json
- Visibility: public

## Page guide

API reference

Schema-driven seeded synthetic CSV/JSON.

POST

/api/v1/tools/mock-data-generator/run

Base URL: https://happytails.ai · public API not connected

## Overview

Synthetic demo records; emails use happytails.ai.

All API requests process supplied data on the server.

## Request parameters

Send a JSON object. Unknown properties are rejected. Omitted options use the defaults below; enter numbers and booleans as JSON values, not quoted text.

No text input is needed. Use the settings below.

This endpoint does not accept a `files` array.

### Options

#### `options.n`

Type: number

Records

Default: `10.0`

## Success response

HTTP 200 returns `tool` and `result`. Text is in `result.text`; parsed JSON may also appear in `result.data`. Generated files are in `result.files` with `name`, `mime`, `bytes` and `base64`. Decode the bytes before saving. Empty file arrays and null text are valid for operations returning another result type.

### Complete output schema

```json
{
  "type": "object",
  "required": [
    "tool",
    "result"
  ],
  "properties": {
    "tool": {
      "type": "string"
    },
    "result": {
      "type": "object",
      "required": [
        "text",
        "files"
      ],
      "properties": {
        "text": {
          "type": [
            "string",
            "null"
          ]
        },
        "data": {
          "description": "Parsed JSON when the textual result is JSON."
        },
        "name": {
          "type": "string"
        },
        "mime": {
          "type": "string"
        },
        "files": {
          "type": "array",
          "items": {
            "type": "object",
            "required": [
              "name",
              "mime",
              "bytes",
              "base64"
            ],
            "properties": {
              "name": {
                "type": "string"
              },
              "mime": {
                "type": "string"
              },
              "bytes": {
                "type": "integer"
              },
              "base64": {
                "type": "string",
                "contentEncoding": "base64"
              }
            }
          }
        }
      }
    }
  }
}
```

## Limits and failures

Limits below are enforced by this endpoint. Additional format, page, duration and model limits in the behavior notes also apply. Browser UI limits can differ from API limits.

| Field | Value |
| --- | --- |
| `request_bytes` | 8388608 |
| `input_characters` | 1000000 |
| `files_bytes` | 5242880 |
| `max_files` | 0 |
| `timeout_seconds` | 12 |

Invalid requests return an `error` object with `code` and `message`. Read [HTTP statuses, retries, timeouts and concurrency](https://happytails.ai/en/api/#limits). Execution is synchronous and results are returned in the response.

## Complete request schema

### Expand the JSON schema

```json
{
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "input": {
      "type": "string",
      "maxLength": 1000000,
      "default": "",
      "description": "Plain text input. File tools use files instead unless otherwise documented."
    },
    "options": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "n": {
          "type": "number",
          "description": "Records",
          "default": 10.0
        }
      }
    }
  }
}
```

For browser automation, use the central [WebMCP guidance](https://happytails.ai/en/api/#browser-agents) and discover the tools actually exposed by the browser.

Request example

### cURL

```bash
curl https://happytails.ai/api/v1/tools/mock-data-generator/run \
  -H "Content-Type: application/json" \
  --data '{"options": {"n": 10.0}}'
```

### JavaScript

```javascript
const payload = {
  "options": {
    "n": 10.0
  }
};

const response = await fetch(
  "https://happytails.ai/api/v1/tools/mock-data-generator/run",
  {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(payload)
  }
);
const data = await response.json();
if (!response.ok) throw new Error(data.error.message);
console.log(data.result);
```

### Python

```python
import json
from urllib.request import Request, urlopen

payload = json.loads('{"options": {"n": 10.0}}')

request = Request(
    "https://happytails.ai/api/v1/tools/mock-data-generator/run",
    data=json.dumps(payload).encode(),
    headers={"Content-Type": "application/json"},
)
with urlopen(request, timeout=200) as response:
    result = json.load(response)
    print(result)
```

### JSON

```json
{
  "options": {
    "n": 10.0
  }
}
```

Replace the API origin and input values for your application.

200 OK · response structure

### JSON

```json
{
  "tool": "mock-data-generator",
  "result": {
    "text": null,
    "files": []
  }
}
```

Illustrative envelope. Actual text, filename, MIME type and bytes depend on the result. See the complete output schema.

400 Bad Request

### JSON

```json
{
  "error": {
    "code": "INVALID_INPUT",
    "message": "Unknown request property. See the tool input schema."
  }
}
```