Finance API CORS

Fix finance API CORS errors in browser apps

Finance APIs and market data endpoints often work in server tools but fail in browser apps because the response does not allow your origin.

Use in Production Try in Development

One prefix

fetch('https://corsproxy.io/?url=https%3A%2F%2Fquery1.finance.yahoo.com%2Fv8%2Ffinance%2Fchart%2FAAPL')
  .then(response => response.json())
  .then(data => console.log(data));

When this helps

Market dashboards

Portfolio side projects

Trading education tools and internal finance widgets

Free for development, paid for production

Production gives you higher traffic room, caching for repeated data requests, and a dashboard for usage spikes.

Production domains need an API key. Free stays focused on localhost-like development so the production path stays reliable.