Complete backend

api/routes/citiesRouter.js

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+const router = require('express').Router();
+
+const Cities = require('../models/citiesModel');
+
+router.get('', async (req, res) => {
+    try {
+        const cities = await Cities.getCities();
+        res.status(200).json(cities);
+    } catch (e) {
+        res.status(500).json(e);
+    }
+})
+
+module.exports = router;

api/routes/countriesRouter.js

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+const router = require('express').Router();
+const Cities = require('../models/citiesModel');
+
+router.get('/:country_id', async (req, res) => {
+    const { country_id } = req.params;
+    try {
+        const cities = await Cities.getCitiesByCountry(country_id);
+        res.status(200).json(cities);
+    } catch (e) {
+        res.status(500).json(e);
+    }
+})
+
+module.exports = router;

api/routes/pathRouter.js

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+const router = require('express').Router();
+
+const Roads = require('../models/roadsModel');
+const Cities = require('../models/citiesModel');
+
+const searchPath = require('../../helpers/dijkstra_algo');
+
+router.get('', async (req, res) => {
+    const { start_city_id, end_city_id } = req.body;
+
+    try {
+        const cities = await Cities.getCities();
+        const roads = await Roads.getRoads();
+
+        let { path, distance } = searchPath(cities, roads, start_city_id, end_city_id);
+        const formatedPath = formatPath(path, cities)
+
+        let response = { path: formatedPath, distance }
+
+        res.status(200).json(response);
+    } catch (e) {
+        res.status(500).json(e);
+    }
+})
+
+function formatPath(path, cities) {
+    const complete_path = []
+
+    for (let path_city of path) {
+        for (let city of cities) {
+            if (city.id == path_city) {
+                complete_path.push({ id: city.id, name: city.name });
+            }
+        }
+    }
+
+    return complete_path
+}
+
+module.exports = router;

api/routes/roadsRouter.js

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+const router = require('express').Router();
+const Roads = require('../models/roadsModel');
+
+router.get('', async (req, res) => {
+    try {
+        const roads = await Roads.getRoads();
+        res.status(200).json(roads);
+    } catch (e) {
+        res.status(500).json(e);
+    }
+})
+
+module.exports = router;