MatissJanis
sls-ynab-stock-updates
JavaScript

Serverless function to automatically update balance of investment accounts in YNAB

Last updated May 25, 2026
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README

sls-ynab-stock-updates

Deploy

Serverless function to automatically update investment account balances in YNAB. If the assets are in multiple currencies - tries it's best to convert to the accounts base currency.

Requirements

  • Node
  • NPM

Installation

npm install

Setup

There are a few preliminary steps that must be taken to start using this serverless function.

  • Add information about your portfolio to the YNAB accounts you would like to be tracked.
Format: INVESTMENTS: {Stock Symbol} {Amount}, {Stock Symbol} {Amount}...

Example: INVESTMENTS: AAPL 191, MSFT 120

Crypto example: INVESTMENTS: BTC-EUR 0.09231, XMR-USD 120.3341

  • Create a serverless.env.yml environment variable file and copy the existing variables from the example file.
cp serverless.env.example.yml serverless.env.yml
  • Set the environment variables
  • YNABAPITOKEN: personal API token generated in the YNAB homepage.
  • AUTOMATIC_APPROVAL: should the automatic balance adjustment transactions be auto-approved? Useful to set this to true if you are running this function hourly/daily/weekly/etc and don't want to go through streams of transactions.
  • AUTOMATICCURRENCYCONVERSION: should automatic currency conversion be turned on? Converts to budgets base currency. Useful if, you have assets in multiple currencies and they are all in one account.
  • ALARM_EMAIL: what email should be notified if the function starts malfunctioning and throwing errors?
  • Deploy the function
npm run deploy

Development

  • Define necessary env variables in serverless.env.yml (example available in serverless.env.example.yml)
  • Run (to run locally)
npm start

Deployment

If you wish to run this serverless function on a schedule (configured in serverless.yml file), then it must be deployed. This can be done by running the following command.

npm run deploy
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