Sometimes, we want to fix the "Cannot find module ‘@babel/core’" error.
In this article, we’ll look at how to fix the "Cannot find module ‘@babel/core’" error.
To fix the "Cannot find module ‘@babel/core’" error, we should install the @babel/core package.
To install it, we run
npm install @babel/core --save
To fix the "Cannot find module ‘@babel/core’" error, we should install the @babel/core package.
Sometimes, we want to fix the ‘schema hasn’t been registered for model’ error with Mongoose
In this article, we’ll look at how to fix the ‘schema hasn’t been registered for model’ error with Mongoose.
To fix the ‘schema hasn’t been registered for model’ error with Mongoose, we should call require on the model files we created.
For instance, we write
/models/Posts.js
const mongoose = require('mongoose');
const PostSchema = new mongoose.Schema({
title: String,
link: String,
upvotes: {
type: Number,
default: 0
},
comments: [{
type: mongoose.Schema.Types.ObjectId,
ref: 'Comment'
}]
});
mongoose.model('Post', PostSchema)
to create the PostSchema and register it as 'Post' with the mongoose.model method.
Then we register the models after we connect to the database with
db.js
const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/news');
require('./models/Posts');
to call require with './models/Posts' to run the code in /models/Posts.js which registers the model Post model so we can use it.
To fix the ‘schema hasn’t been registered for model’ error with Mongoose, we should call require on the model files we created.
Sometimes, we want to pass JSON to HTTP POST request made with Node.js request.
In this article, we’ll look at how to pass JSON to HTTP POST request made with Node.js request.
To pass JSON to HTTP POST request made with Node.js request, we call request with the json option set to true and the body option set to a plain JavaScript object with the request body.
For instance, we write
const rp = require('request-promise');
await rp({
method: 'POST',
uri: 'http://localhost:3000/',
body: {
val1: 1,
val2: 2
},
json: true
})
to call rp with the body set a request body object.
And we set json to true to send the body as a JSON payload.
We set method to 'POST' to make a POST request.
To pass JSON to HTTP POST request made with Node.js request, we call request with the json option set to true and the body option set to a plain JavaScript object with the request body.
Sometimes, we want to get raw request body using Express and Node.js.
In this article, we’ll look at how to get raw request body using Express and Node.js.
To get raw request body using Express and Node.js, we can use the body-parser package.
For instance, we write
const bodyParser = require('body-parser');
app.use(bodyParser.raw(options));
app.get(path, (req, res) => {
console.log(req.body)
});
to call bodyParser.raw to return a middleware that parses the request body into a buffer.
Then we call app.use with the returned middleware to use it our app.
Finally, in our GET request handler, we get the raw request body as a buffer object from req.body.
To get raw request body using Express and Node.js, we can use the body-parser package.
Sometimes, we want to loop through files in a folder Node.js.
In this article, we’ll look at how to loop through files in a folder Node.js.
To loop through files in a folder Node.js, we can use the fs promises module and the for-of loop.
For instance, we write
const loopFiles = async (dir) => {
try {
const files = await fs.promises.readdir(dir);
for (const file of files) {
const p = path.join(moveFrom, file);
const stat = await fs.promises.stat(p);
if (stat.isFile()) {
console.log("'%s' file.", fromPath);
} else if (stat.isDirectory()) {
console.log("'%s' directory.", fromPath);
}
}
} catch (e) {
console.error(e);
}
}
to define the loop function that gets the contents of dir with readdir.
Then we loop through the files array returned from the promise returned by readdir.
Next, we use the for-of loop to loop through files.
We get the full path p with path.join.
And then we call stat with p to get the data about the file or folder.
Then we call isFile to check if the the entity at p is a file.
And we call isDirectory to check if the the entity at p is a folder.
To loop through files in a folder Node.js, we can use the fs promises module and the for-of loop.