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weather-now/README.md
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01128fhuZbgivaSJvtMf4s1G
2026-09-27 21:10:38 +02:00

2.2 KiB

weather-now

Type any city and see its temperature, sky, humidity and wind right now, from the free Open-Meteo APIs. It teaches chaining two API calls: the answer to the first becomes the question for the second.

Run

Get it: git clone https://git.devai.io/templates/weather-now.git

Double-click index.html — it opens in your browser and works, as long as you're online (it calls the weather service live). Nothing to install.

Or serve it like production:

docker compose up --build

Then open http://localhost:8080.

How it works

Weather is looked up by coordinates, not city names, so loadWeather(city) makes two requests, one after the other:

  1. Geocode — geocoding-api.open-meteo.com/v1/search?name=Tokyo answers with the best match's latitude and longitude.
  2. Forecast — those numbers go into api.open-meteo.com/v1/forecast?latitude=…&longitude=…&current=…, which answers with the current temperature, humidity, wind and a weather_code.

await makes the second call wait for the first. The weather code is a WMO number (0 = clear, 61 = light rain, …); WEATHER_CODES maps the common ones to words and an emoji. encodeURIComponent keeps spaces and accents in a city name from breaking the URL. Both APIs are free and need no key.

"Loading…" shows while the requests run, "City not found." when geocoding has no match, and a friendly error if either call fails.

Try it: add &temperature_unit=fahrenheit to the forecast URL, ask for count=5 and let the user pick between matches, or add more weather codes.

Layout

index.html   the search form, a status line and a hidden weather card
app.js       the code table, loadWeather() and render()
styles.css   the look; follows your system's light or dark mode

Deploy

Push to your own GitHub repo and the shipped workflow (.github/workflows/ci.yml) tests the compose stack, publishes the image to GHCR, and — once you set the DEPLOY_HOST / DEPLOY_USER variables and DEPLOY_KEY secret — deploys it to your server over ssh.


Part of devai.io — the APIs & Data track: fetch real data from the internet. Next up: github-profile.