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1.3.1 • Public • Published


Queryable typescript API for weather information from openweathermap


This project allows one to create a query in order to find out about a weather in certain location. Queries are promise-based and will only execute when the query is complete. This package provider information on everything from pressure, to rain, to weather/weather icons and descriptions in chosen language. Package will select which api it should call based on the parameters of query.

  1. Can be used with both pro and free accounts with no difference in usage.
  2. Can be used to find past, present and future weather, with restrictions based on
  3. Will cache both sent requests and weather information from sent requests (useful if you want to display a week-worth of weather)
  4. Is enviroment-agnostic, can be used with custom fetch function and custom storage
  5. Can be used with local storage (by default, sent requests are cached indefinitely in global object, each instance of forecast keeps track of weather information)
  6. Can do location lookup by city name, zip code or latitude and longitude
  7. Has basic date features, like lookup for yesterday (from set date), tomorrow, hour-of-the-day etc.
  8. Is fully typed and supports multilingual queries with support for different units available
  9. Dev project contains test project and a series of unit tests
  10. Best results can be obtained using lat/long combination

Simple examples of use

const weather = forecast(key).around(50.08804, 14.42076);
await writeWeatherWithDate(weather);
await writeWeatherWithDate(weather);
await writeWeatherWithDate(weather);
await writeWeatherWithDate(weather);;
await writeWeatherWithDate(weather);
await writeWeatherWithDate(weather);
await writeWeatherWithDate(weather);
await writeWeatherWithDate(weather);
await writeWeatherWithDate(weather);

This example only uses two requests, the rest of information is obtained from stored values from api.

Unit test example of pro version of api

const load = forecast(apiKey, true).in(524901).at(new Date(fakeDate), tenDaysAhead).fetch(global.fetch); // gets data from .at(date) by us zipcode
expect(await load.wind('speed')).toBe(4.1);
expect(await load.wind('degree')).toBe(249);
// sunny(), cloudy(), is(), ashy() and other methods can be used to get description of weather at set time
expect((await load.sunny())?.description).toBe('sky is clear');

Changes since 1.1.0

  1. Better detection of past dates
  2. Added an option to subscribe with a function to any date/location change
  3. Added appropriate unit tests
  4. Better api documentation

Example of subscription use

With subscribers used, there is a greater attention to speedy delivery, which might mean some requests will not be cached. If you need cached requests with an array of weather results, please see the example below this one.

forecast(key).around(50.08804, 14.42076)
    .subscribe(async (from, _, cast) => {
            date: from,
            clouds: await cast.clouds() || 0,
            rain: await cast.rain() || 0,
            weather: (await || '',
console.log(weatherList.sort((a, b) => -;

Changes since 1.2.0

Stop emptying cache after failed fetch. Add .list function to allow users to iterate over wide variety of results. .list allows you to specify a certain condition and get results across a wide range of dates with just one or two lines. All of the functions of usual weather api will return an array of results with dates appended to them.

Simple example of .list

const list = forecast(key)
    .around(50.08804, 14.42076)
    .at(today, fourDaysLater)
console.log(await list.clouds());
console.log(await list.percipitation('rain'));
console.log(await list.cloudy()); // This will fetch the description of the clouds outside from today to 4 days later date, with every-hour updates.

Changes since 1.3.0

Can now use .geo() to access user location on devices supporting navigator.geolocation.getCurrentPosition.

In case of server-side use, you can define your own getCurrentPosition callback.

Changes since 1.3.1

Fix a bug where time machine is called with invalid date

Other packages of interest

  1. react-weather-forecast - deprecated and deleted.
  2. react-forecast-query:, Higher order component wrapper for this package.

If you find any bugs, or have ideas about improving this package, please file in a task or a pull request :) .

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  • jindra12