app.js

const express = require("express");
+ const bodyParser = require("body-parser");

const dojosRoutes = require("./api/routes/dojos");

const app = express();
+ const jsonParser = bodyParser.json();

app.listen(8000);

+ app.use(jsonParser);

... // HEADER

app.use("/dojos", dojosRoutes);

... // ERROR IMPLEMENTATION