index.js

const PORT = process.env.PORT || 4300,
	express = require('express'),
	bodyParser = require('body-parser'),
	axios = require('axios'),
	vk = require('./src/execute')

const tokens = {}

const app = express()

app.use(bodyParser.urlencoded({ extended: true }))
app.use(bodyParser.json())

app.all('/method/:method', async (req, res) => {
	try {
		const { method, access_token, ...params } = { ...req.body, ...req.params, ...req.query }
		if (access_token === undefined) {
			res.json({
				error: 'No access_token',
				body: req.body,
				params: req.params,
				query: req.query,
			})
			return
		}
		if (tokens[access_token] === undefined) {
			tokens[access_token] = vk(access_token)
		}
		const response = await tokens[access_token].execute(method, params)
		if (response.error_code !== undefined) {
			res.json({
				error: {
					error_code: response.error_code,
					error_msg: response.error_msg,
					request_params: Object.entries(params).map(([key, value]) => ({
						key,
						value,
					})),
				},
			})
		} else {
			res.json({
				response,
			})
		}
	} catch (e) {
		console.error(e)
		res.json(e)
	}
})

app.listen(PORT, () => console.log(`Server started on ${PORT} port`))