appwrite/app/sdks/web-javascript/docs/examples/database/create-document.md

let sdk = new Appwrite();

sdk
    .setProject('5df5acd0d48c2') // Your project ID
;

let promise = sdk.database.createDocument('[COLLECTION_ID]', {}, [], []);

promise.then(function (response) {
    console.log(response); // Success
}, function (error) {
    console.log(error); // Failure
});