You can list all created databases in MongoDB with a Python script. This Python script might also be available for Windows.

The installed versions of Python, MongoDB, pymongo

• Python: 3.13.9
• MongoDB Server: 7.0.25
• pymongo 4.15.3

I have older version, what I can do?

It might work with older version, but I’m not sure.

Updating pymongo

pip install pymongo -U

What does this script do?

✅️ Checking whether MongoDB is installed on Linux and Windows

✅️ Checking whether pymongo is installed on Linux and Windows. Pymongo you for the script

✅️ Clear the screen on Linux and Windows

✅️ Check the connection to the server of MongoDB

✅️ List the databases without the size. It uses the MongoDB command „listDatabases“

Installation of

Python

Go to the official download site of Python for Windows / Mac and Linux (if it is not installed).

PyMongo

After the installation of Python, you can install it with pip install pymongo. If you are not sure, you can run this script. It will terminate, if there is no installation of pymongo.

The script

import pymongo
import os.path
import os
import sys

# --- 1. Define Paths and Constants ---

# Path to the mongod executable, depending on the operating system
def get_mongoserver_path():
    if os.name == 'nt':
        # Typical path on Windows. Warning: Version-dependent!
        # A generic check is better here, but it's complex.
        # We'll stick to the Linux path for the function below.
        # For a realistic Windows check, one would have to search PATH.
        return None # We skip the path check on Windows in the function below
    else:
        # Typical path on Linux
        return "/usr/bin/mongod" 

# --- 2. Helper Function: Clear screen ---
def clear_screen():
    if os.name == 'nt':
        os.system('cls')
    else:
        os.system('clear')

clear_screen()
print("--- MongoDB & PyMongo Systemcheck ---")

# --- 3. Function to check the MongoDB Server binary ---
def check_mongodb_binary():
    """Checks if the mongod command/binary exists at the Linux standard path."""
    
    # Since we don't know the exact path on Windows, we only check on POSIX (Linux/macOS)
    if os.name == 'posix':
        path = get_mongoserver_path()
        if os.path.exists(path):
            print("✅ MongoDB Server Binary (mongod) found.")
        else:
            print(f"❌ MongoDB Server Binary (mongod) NOT found at {path}.")
            print("   Please ensure that MongoDB Server is installed.")
    else:
        # On Windows / Mac, we assume it's in the PATH or already running.
        print("✅ MongoDB Server binary check skipped (OS is not Linux).")

# --- 4. Function to check the PyMongo package ---
def check_pymongo_module():
    """Checks if the PyMongo module is importable in Python."""
    try:
        # This import tests if the module exists in the Python path
        import pymongo
        print("✅ PyMongo module is installed and ready.")
    except ImportError:
        print("❌ PyMongo module NOT found.")
        print("   Please install it: pip install pymongo")
        # Exit the script, as the next function will fail
        sys.exit(1) 

# --- 5. Run functions and test connection ---

check_pymongo_module()
check_mongodb_binary()

print("\n--- Database Connection Test ---")
try:
    # Tries to establish a connection
    myclient = pymongo.MongoClient("mongodb://localhost:27017", serverSelectionTimeoutMS=5000)
    
    # Tests the connection (if the server is running)
    myclient.admin.command('ping') 
    
    print("✅ Connection to MongoDB Server (localhost:27017) successful.")
    print("\nAvailable Databases:")
    for db in myclient.list_databases():
        print(f"- {db['name']}")

except pymongo.errors.ServerSelectionError as e:
    print("❌ Connection error:")
    print("   The MongoDB Server is NOT running at localhost:27017.")
    print("   Please start the server.")
    print(f"   Error details: {e}")
except Exception as e:
     print(f"An unexpected error occurred: {e}")

finally:
    print("\n--- Finished ---")