Here you will find a list of examples that takes you through the basics of connecting to a local node, retrieving data from the Node and chain and execute transactions on the chain. It uses the [[ApiPromise]] interface.
For the following examples, you need a local node. It is usually convenient testing with:
From each folder, run
yarn to install the required dependencies and then run
yarn start to execute the example against the running node.
Some of the examples use the following accounts:
Those accounts are easy to add if you don't have/see them. The seed of Alice's account is
keyring.addUri(...), dev seed implied) and the seed of Bob is... well you guess...