Hello, world!

This simple example demonstrates how applications on ICP are structured using a backend smart contract and a frontend smart contract, and provides an introduction to the programming language Motoko.

This variation of "Hello, world!" is written in Motoko, a programming language designed specifically for developing canisters (referred to as canisters) on ICP.

What is ICP Ninja?

ICP Ninja is a web-based integrated development environment (IDE) for the Internet Computer. It allows you to write code and deploy applications directly from your web browser in a temporary, sandbox-like environment.

For users who may already be familiar with the Internet Computer or who would rather use more advanced tooling such as command-line development tools, please refer to the ICP developer documentation to learn more.

Projects deployed to ICP from ICP Ninja are available on the mainnet for 20 minutes at a time. After 20 minutes, the project must be redeployed.

To deploy your project for long-term, production use such that it persists longer than 20 minutes without needing to be redeployed, you must migrate the files off of ICP Ninja and deploy them to the mainnet via dfx in a command-line environment.

Project structure

The /backend folder contains the Motoko canister, app.mo. The /frontend folder contains web assets for the application's user interface. The user interface is written with plain JavaScript, but any frontend framework can be used.

Edit the mops.toml file to add Motoko dependencies to the project.

Deploying from ICP Ninja

When viewing this project in ICP Ninja, you can deploy it directly to the mainnet for free by clicking "Deploy" in the upper right corner.

To download or reset the project files, click the menu option next to the deploy button.

Editing files

To make adjustments to this project, you can edit any file that is unlocked. Then, redeploy your application to view your changes.

To edit files that are immutable in ICP Ninja, you can export the project to GitHub or download the project to your local environment using the "Download files" option.

Build and deploy from the command-line

To migrate your ICP Ninja project off of the web browser and develop it locally, follow these steps. These steps are necessary if you want to deploy this project for long-term, production use on the mainnet.

1. Download your project from ICP Ninja using the 'Download files' button on the upper left corner under the pink ninja star icon.

2. Open the BUILD.md file for further instructions.