Data Autogeneration

---

Chimera allows you to automatically generate mock JSON data using a custom schema file. This is useful when you need realistic sample data for testing or demos without manually crafting each entry.

Schema Format

A schema file defines the structure of the data and how values should be generated. Here’s a simple example:

{
    "routes": [
        {
            "path":"api/v2/data",
            "no_of_entries": 2,
            "schema": {
                "id": "id",
                "created_on": "date",
                "mssg": "lorem"
            },
            "null_percentage": 0
        }
    ]
}

Supported Placeholders

Placeholder	Description
name	Random name
id	Random number
integer	Random number
date	Date in DD-MM-YYYY format
datetime	Date in DD-MM-YYYYTHH:MM:SS format
lorem	Random text
string	Random word
boolean	Random boolean value

More placeholder types will be added in future versions.

Usage

Use the --path flag with the -X option to autogenerate data:

chimera-cli.exe --path schema.json http -X

This will generate mentioned items for each endpoint defined in the schema and serve them as mock API routes.

• path: Name of the route
• no_of_entries: Number of mock entries to generate
• schema: Define fields and their data type
• null_percentage: Percentage of fields and rows to be randomly set as null

You can also combine it with other flags like --port, --latency, and --sort.

Example Schema File

{
    "routes": [
        {
            "path":"api/v2/data",
            "no_of_entries": 2,
            "schema": {
                "id": "id",
                "created_on": "date",
                "mssg": "lorem"
            },
            "null_percentage": 0
        },
        {
            "path":"products",
            "no_of_entries": 3,
            "schema": {
                "id": "id",
                "rsnd": "integer",
                "name": "name",
                "probability": "boolean",
                "date": "datetime",
                "desc": "lorem"
            },
            "null_percentage": 0
        }
    ]
}

Output Example

Output response for route /api/v2/data

[
    {
        "created_on": "05-07-2025",
        "id": 1,
        "mssg": "est nostrum nulla dolores ex voluptas.\nomnis quisquam neque est omnis at."
    },
    {
        "created_on": "05-07-2025",
        "id": 2,
        "mssg": "laboriosam nostrum blanditiis voluptas rerum quaerat exercitationem molestiae autem."
    }
]

Output response for route /products

[
    {
        "date": "2025-07-05T17:59:55.523450+00:00",
        "desc": "et eveniet veniam et architecto rerum.",
        "id": 1,
        "name": "Keaton Gutmann",
        "probability": true,
        "rsnd": 74
    },
    {
        "date": "2025-07-05T17:59:55.524469200+00:00",
        "desc": "asperiores molestiae corrupti delectus repellendus consequuntur at.\nid aut autem fuga officia.",
        "id": 2,
        "name": "Shakira Hickle",
        "probability": true,
        "rsnd": 38
    },
    {
        "date": "2025-07-05T17:59:55.524489100+00:00",
        "desc": "quis sit sit consequuntur et animi similique.\niste dicta et aperiam unde ut et.",
        "id": 3,
        "name": "Virgie Nitzsche",
        "probability": true,
        "rsnd": 36
    }
]