mpds_api_example.js

#!/usr/bin/env node

var https = require('https');
var qs = require('querystring');

var api_key = ""; // your key
var host = "api.mpds.io", port = 443, path = "/v0/download/facet";
var search = {
    "elements": "Mn",
    "classes": "binary, oxide",
    "props": "isothermal bulk modulus", // see https://mpds.io/#hierarchy
    "lattices": "cubic"
};

https.request({
    host: host,
    port: port,
    path: path + '?' + qs.stringify({q: JSON.stringify(search), pagesize: 10}),
    method: 'GET',
    headers: {'Key': api_key}
}, function(response){
    var result = '';
    if (response.statusCode != 200){
        // NB 400 means wrong input, 403 means authorization issue etc.
        // see https://en.wikipedia.org/wiki/List_of_HTTP_status_codes
        return console.error('Error code: ' + response.statusCode);
    }
    response.on('data', function(chunk){
        result += chunk;
    });
    response.on('end', function(){
        result = JSON.parse(result);
        if (result.error) console.error(result.error);
        else {
            console.log('OK, got ' + result.out.length + ' hits');
        }
    });
}).on('error', function(err){
    console.error('Network error: ' + err);
}).end();