nws-wrapper/funcs.js

National Weather Service (US) API Wrapper for JS

function getPointData(lat, lon) {       
  const url = `https://api.weather.gov/points/${lat},${lon}`;
  return fetch(url)
    .then(response => response.json())
    .then(data => {
      return data.properties;
    })
    .catch(error => console.error(error));
}


function getGrid(lat, lon) {       
  return getPointData(lat, lon)
    .then(properties => {
      return `${properties.gridX},${properties.gridY}`
    });
}

function checkWeatherWarnings(latitude, longitude) {;
  const apiUrl = `https://api.weather.gov/alerts/active?point=${latitude},${longitude}`;

  return fetch(apiUrl)
    .then(response => response.json())
    .then(data => {
      if (data.features.length > 0) {
        const alerts = data.features.map(alert => {
          const ev = alert.properties.event;
          const hl = alert.properties.headline;
          const des = alert.properties.description;
          const descr = des;
          return { descr, hl };
        });
        return alerts;
      } else {
        return "No active weather warnings found for this location.";
      }
    })
    .catch(error => console.error(error));
}

function checkKeyword(headline) {
  let keywords = ["Watch", "Advisory", "Warning", "Statement", "Emergency", "Tornado", "Hurricane", "Tropical Storm", "Blizzard"];
  let presentKeywords = [];

  keywords.forEach(keyword => {
    if (headline.indexOf(keyword) !== -1) {
      presentKeywords.push(keyword);
    }
  });

  if (presentKeywords.length > 0) {
    console.log("The string contains " + presentKeywords.join(", ") + ".");
    return presentKeywords.join(", ");
  } else {
    console.log("The string does not contain Watch, Advisory, Warning, or Statement.");
    return "NONE";
  }
}

function getRadarSingle(office) {
  return `https://radar.weather.gov/ridge/standard/${office}_0.gif`
}

function getRadarLoop(office) {
  return `https://radar.weather.gov/ridge/standard/${office}_loop.gif`
}

function getNWSOffice(lat, lon) {
  const url = `https://api.weather.gov/points/${lat},${lon}`;
  return fetch(url)
    .then(response => response.json())
    .then(data => data.properties.cwa)
    .catch(error => console.error(error));
}

function getRadarStation(lat, lon) {
  const url = `https://api.weather.gov/points/${lat},${lon}`;
  return fetch(url)
    .then(response => response.json())
    .then(data => data.properties.radarStation)
    .catch(error => console.error(error));
}

module.exports = {
  getPointData,
  getGrid,
  checkWeatherWarnings,
  checkKeyword,
  getRadarSingle,
  getRadarLoop,
  getNWSOffice,
  getRadarStation,
};