Author: John Au-Yeung

Sometimes, we want to make a HTTP get request with query string parameters with Node.js.

In this article, we’ll look at how to make a HTTP get request with query string parameters with Node.js.

How to make a HTTP get request with query string parameters with Node.js?

To make a HTTP get request with query string parameters with Node.js, we can use the https.get method.

For instance, we write

const requestUrl = url.parse(url.format({
  protocol: 'https',
  hostname: 'example.com',
  pathname: '/the/path',
  query: {
    key: value
  }
}));

const req = https.get({
  hostname: requestUrl.hostname,
  path: requestUrl.path,
}, (res) => {
  // ...
})

to call url.parse to create a URL with the protocol, hostname, pathname and the query string parameters in the query property’s object.

Then we call https.get with an object with the hostname and path set to the hostname and path.

The path has the query string.

And we get the response from res in the callback.

Conclusion

To make a HTTP get request with query string parameters with Node.js, we can use the https.get method.

Sometimes, we want to convert Mongoose docs to JSON

In this article, we’ll look at how to convert Mongoose docs to JSON.

How to convert Mongoose docs to JSON?

To convert Mongoose docs to JSON, we can use the lean method.

For instance, we write

UserModel.find().lean().exec((err, users) => {
  console.log(users);
})

to call lean after find to convert the query results returned by find to a plain JavaScript object.

Then we call exec with a callback to get the returned query results from users.

Conclusion

To convert Mongoose docs to JSON, we can use the lean method.

Sometimes, we want to fix the "Cannot find module ‘ts-node/register’" error with Node.js.

In this article, we’ll look at how to fix the "Cannot find module ‘ts-node/register’" error with Node.js.

How to fix the "Cannot find module ‘ts-node/register’" error with Node.js?

To fix the "Cannot find module ‘ts-node/register’" error with Node.js, we can install ts-node with npm install.

To install it, we run

npm install ts-node --save-dev

Conclusion

To fix the "Cannot find module ‘ts-node/register’" error with Node.js, we can install ts-node with npm install.

Sometimes, we want to fix the "Error: Cannot find module ‘ejs’" error with Node.js.

In this article, we’ll look at how to fix the "Error: Cannot find module ‘ejs’" error with Node.js.

How to fix the "Error: Cannot find module ‘ejs’" error with Node.js?

To fix the "Error: Cannot find module ‘ejs’" error with Node.js, we can install the ejs package.

To install it, we run

npm i ejs

Then we use it with

const ejs = require('ejs');

//...

app.set('view engine','ejs'); 
app.engine('ejs', require('ejs').__express);

to require the ejs module and call app.set to set the view engine to ejs. And we call app.engine with define the ejs view engine by require the module and returning the __express property.

Conclusion

To fix the "Error: Cannot find module ‘ejs’" error with Node.js, we can install the ejs package.

Sometimes, we want to output ‘id’ instead of ‘_id’ with MongoDB.

In this article, we’ll look at how to output ‘id’ instead of ‘_id’ with MongoDB.

How to output ‘id’ instead of ‘_id’ with MongoDB?

To output ‘id’ instead of ‘_id’ with MongoDB, we call schema’s virtual method to add a new computed field and return the _id value with the field.

And then we call set to set virtuals to true to return the field.

For instance, we write

Schema.virtual('id').get(function() {
  return this._id.toHexString();
});

Schema.set('toJSON', {
  virtuals: true
});

to call virtual with 'id' to create the id field.

And we call get with a function to return the hex string version of the _id with toHexString.

Finally, we call set with 'toJSON' and an object with virtuals set to true to return the id property with the result.

Conclusion

To output ‘id’ instead of ‘_id’ with MongoDB, we call schema’s virtual method to add a new computed field and return the _id value with the field.

And then we call set to set virtuals to true to return the field.