https://api2.realtor.ca/Listing.svc/PropertySearch_Post

realtor.post - returns a request-promise POST with the given options

realtor.buildUrl - returns a URL with the query string constructed from the specified options.

realtor.optionsFromUrl - returns options from a URL from realtor.ca (from the map view)

^ Note: The website link from buildUrl only allows specific price quantities. Any inconsistent PriceMin and PriceMax values will be rounded up to the next price level. Read the source for clarification.

const realtor = require('realtorca');

let opts = {
  LongitudeMin: -79.6758985519409,
  LongitudeMax: -79.6079635620117,
  LatitudeMin: 43.57601549736786,
  LatitudeMax: 43.602250137362276,
  PriceMin: 100000,
  PriceMax: 410000
};

console.log( realtor.buildUrl(opts) );
//https://www.realtor.ca/Residential/Map.aspx#LongitudeMin=-79.6758985519409&LongitudeMax=-79.6079635620117&LatitudeMin=43.57601549736786&LatitudeMax=43.602250137362276&PriceMin=100000&PriceMax=425000


realtor.post(opts)
  .then(data => {
      //json response
  })
  .catch(err => {

  });

Most of the information was pulled from the DOM nodes on the website

All of the following options are optional. The first 3 listed are required but the wrapper will provide a default if they aren't specified.

• CultureId - 1 for EN, 2 for FR. Defaulted to 1.
• ApplicationId - Unused. Defaulted to 1.
• PropertySearchTypeId- Defaulted to 1. Determines the type of property, possible values:
  • 0 No Preference
  • 1 Residential
  • 2 Recreational
  • 3 Condo/Strata
  • 4 Agriculture
  • 5 Parking
  • 6 Vacant Land
  • 8 Multi Family

Most useful options

• PriceMin - Defaults to 0
• PriceMax
• LongitudeMin - Designates the bounds of the query, easiest to find these values from browser requests.
• LongitudeMax
• LatitudeMin
• LatitudeMax
• TransactionTypeId- Defaults to 2?
  • 1 For sale or rent
  • 2 For sale
  • 3 For rent
• StoreyRange - "min-max" i.e. "2-3"
• BedRange - "min-max" if min = max, it searches for the exact value. If it's 1-0, it means it's 1+. Maxes at 5
• BathRange - "min-max"

Others

• Sorting:

• organizationID - sort/search by organizationID of a group of realtors. Value of this field can be found using a URL such as https://www.realtor.ca/Residential/OfficeDetails.aspx?OrganizationId=271479 as pointed out by Froren.
• individualID - sort/search by agentID. Can be found using a URL such as https://www.realtor.ca/Agent/1914698/Gaetan-Kill-130---1152-Main... (in this case individualID = 1914698) as indicated by Kris.
• viewState - m, g, or 1. Seems irrelevant.
• Longitude - Longitude to focus on? Unneeded
• Latitude - Latitude to focus on? Unneeded
• ZoomLevel - not sure what this does
• CurrentPage - read somewhere that it maxes at 51
• RecordsPerPage - maxes at 200
• MaximumResults
• PropertyTypeGroupID - ???
• OwnershipTypeGroupId
  • 0 Any
  • 1 Freehold
  • 2 Condo/Strata
  • 3 Timeshare/Fractional
  • 4 Leasehold
• ViewTypeGroupId
  • 0 Any
  • 1 City
  • 2 Mountain
  • 3 Ocean
  • 4 Lake
  • 5 River
  • 6 Ravine
  • 7 Other
  • 8 All Water Views
• BuildingTypeId
  • 0 Any
  • 1 House
  • 2 Duplex
  • 3 Triplex
  • 5 Residential Commercial Mix
  • 6 Mobile Home
  • 12 Special Purpose
  • 14 Other
  • 16 Row/Townhouse
  • 17 Apartment
  • 19 Fourplex
  • 20 Garden Home
  • 27 Manufactured Home/Mobile
  • 28 Commercial Apartment
  • 29 Manufactured Home
• ConstructionStyleId
  • 0 Any
  • 1 Attached
  • 3 Detached
  • 5 Semi-detached
  • 7 Stacked
  • 9 Link
• AirCondition- 0 or 1, defaults 0
• Pool - 0 or 1, defaults 0
• Fireplace - 0 or 1, defaults 0
• Garage - 0 or 1, defaults 0
• Waterfront - 0 or 1, defaults 0
• Acreage - 0 or 1, defaults 0
• Keywords - search text
• ListingIds - Comma Separated listing Ids
• ReferenceNumber - Search using MLS#
• OpenHouse - 0 or 1, must include if filtering by open house
  • OpenHouseStartDate - MM/DD/YYYY
  • OpenHouseEndDate - MM/DD/YYYY

Feel free to PR and fork.