Server: save incoming JSON to file instead of discarding

This is the first step in actually saving and processing the thing

server.js

@@ -1,6 +1,8 @@
 const express = require('express')
 const bodyParser = require('body-parser')
 const { vueRenderer } = require('@doweb/vuexpress')
+const slugify = require('underscore.string/slugify')
+const fs = require('fs')
 
 const app = express()
 
@@ -83,6 +85,14 @@ app.post('/fetch/', (req, res) => {
     if (post.virtuals.previewImage) {
       post.featuredImage = 'https://cdn-images-1.medium.com/max/800/' + post.virtuals.previewImage.imageId
     }
+
+    // set ID
+    if (!post.slug) {
+      post.slug = slugify(post.title)
+    }
+
+    // save to disk
+    fs.writeFileSync(`${post.slug}.json`, JSON.stringify(json), 'utf-8')
   }
 
   // render the final post