parse values as float before using toFixed (for node 8+)

routes/block.js

@@ -28,7 +28,7 @@ router.get('/:hash', async function(req, res, next) {
   const block = blockInstance.toJSON();
   block.confirmations = lastBlock.maxheight - block.height + 1;
   block.time = block.time.toUTCString();
-  block.difficulty = block.difficulty.toFixed(8);
+  block.difficulty = parseFloat(block.difficulty).toFixed(8);
   block.hashrate = block.hashrate.toLocaleString() + " H/s";
   res.render('block', {
     block,

routes/index.js

@@ -24,7 +24,7 @@ router.get('/', async function(req, res, next) {
   });
   blocks.forEach(function(arrayItem) {
     arrayItem.ago = arrayItem.time.toUTCString().substring(5);
-    arrayItem.difficulty = arrayItem.difficulty.toFixed(8);
+    arrayItem.difficulty = parseFloat(arrayItem.difficulty).toFixed(8);
     arrayItem.hashrate = formatRate(arrayItem.hashrate, 4);
   });
   res.render('index', {