Omi's Minecraft API is a server-side mod which creates a simple API to connect with.

 
Getting Started

• Download the mod and place it on your server.
• When starting the server, the mod will boot up and the config file should show up in the config folder.
• Modify the omiapi-common.toml file as you like.
• Be sure to change the auth settings to avoid third-party connections
• Restart the server
• If when first sending a request to the server, you notice an error in the server console, just ignore it.

About the API

The API allows server admins to connect and interact remotely while maintaining a simple and secure style. This tool will come in handy while working with integrations or webhooks.

Currently, the API supports:

• Retrieving the general status of the server
• Retrieving detailed information about the server (players, config, memory...)
• Retrieving the player list
• Retrieving a player's inventory
• Retrieving the Ban List
• Broadcasting a Minecraft-formatted message
• Whispering to a user
• Executing a command
• Shutdown the server
• Kick a player
• Ban a player (Both via IP and GameProfile/UUID)
• Unbanning a player (IP or GameProfile/UUID)

Moreover, the API not only uses Basic Auth to ensure security but it can also be configured to disable routes you may not use. 

You can see the routes documentation here.