add-transactions.js

let actual = require('@actual-app/api');

async function run() {
  let accounts = await actual.getAccounts();
  let accountId = accounts[0].id;

  let transactions = [];
  for (let i = 0; i < 10; i++) {
    transactions.push({
      payee: 'Payee ' + ((Math.random() * 10) | 0),
      amount: (-Math.random() * 10000) | 0,
      date: '2019-08-18'
    });
  }

  await actual.importTransactions(accountId, transactions);
}

actual.runWithBudget('My-Stash2', run);

set-budgets.js

let actual = require('@actual-app/api');

async function run() {
  let categories = await actual.getCategories({ asList: true });

  for (let category of categories) {
    if (!category.is_income) {
      await actual.setBudgetAmount(
        '2019-08',
        category.id,
        (Math.random() * 10000) | 0
      );
    }
  }
}

actual.runWithBudget('My-Stash2', run);