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Learn how to make HTTP Post requests in JavaScript

Updated on Dec 27,2023

Learn how to make HTTP Post requests in JavaScript

Table of Contents:

  1. Introduction
  2. Setting up the Route
  3. Adding JSON Parsing to Express
  4. Adapting the Fetch Function
  5. Testing the Server and Client
  6. Sending a Response Back to the Client
  7. Handling the Response in the Client
  8. Persistence of Latitude and Longitude Data
  9. Saving Data to a Text File
  10. Adding a Button to Send Data to the Server
  11. Introduction to Databases
  12. Saving Data to a Database using NeDB

Article:

Introduction

In this article, we will explore the process of sending data from a client to a server, and then saving that data to a database. The main goal is to understand the key components involved in this process and how they work together. We will start by setting up the route in the server to receive the data, then we will add JSON parsing to the Express framework to make the data readable. Next, we will modify the Fetch function in the client to specify a POST request to send the data.

Setting up the Route

To start, we need to set up a route in our server to receive the data from the client. This route will be specified as a POST request. In our code, we will use the Express framework to handle this. We will define the address or endpoint for this route and set up a callback function to handle the incoming data. In this callback function, we will console log the request to see if We Are receiving the data successfully.

Adding JSON Parsing to Express

In order to work with the incoming data, we need to add JSON parsing to our Express framework. This will allow the server to understand the data as JSON and make it readable in our code. We will use the express.json function to achieve this. Additionally, we can specify options to control the maximum size of the data being received to prevent flooding the server with large amounts of data.

Adapting the Fetch Function

Now, let's move to the client code and modify the Fetch function to send the data as a POST request. We will Create an object called Data and send the latitude and longitude inside this object. To send a POST request, we need to pass a Second argument to the Fetch function in the form of a JavaScript object. This object will specify the method as POST, set the body of the request to the data in JSON format, and include the necessary header to indicate that we are sending data as JSON.

Testing the Server and Client

Now that we have set up the server and made the necessary modifications in the client code, it's time to test our implementation. We will run the server and refresh the webpage to trigger the client code. We will check the server console to see if we are receiving the data successfully. If everything is working correctly, we should be able to see the latitude and longitude values in the server console.

Sending a Response Back to the Client

Currently, our server is only console logging the received data. To complete the request, it is important to send a response back to the client. We can use the response.json function to send a JSON object as the response. In this case, we will send a success status along with the latitude and longitude values as a confirmation that the data has been received.

Handling the Response in the Client

In the client code, we need to handle the response from the server. We can use the response.json function to Read the response as JSON. By using the await keyword and making the callback function asynchronous, we can receive the response and console log the data. This will allow us to see the success status and the latitude and longitude values sent back from the server.

Persistence of Latitude and Longitude Data

To make the data persist even after restarting the server, we can store the latitude and longitude values in an array or a text file. In this section, we will explore two different approaches. First, we will store the data in an array in the server code. This will keep the data in memory but will be lost once the server is restarted. Second, we will use the Node file system Package to save the data to a text file. This will allow us to load and retrieve the data even after restarting the server.

Saving Data to a Text File

Using the Node file system package, we can save the latitude and longitude data to a text file. We will use the fs.writeFile function to write the data to the file in a specific format, such as JSON or plain text. This will provide a way to persist the data even after the server is restarted.

Adding a Button to Send Data to the Server

To make the data sending process more interactive, we can add a button to the HTML page. When the button is clicked, the latitude and longitude values will be sent to the server. This will allow the user to control when the data is sent and simulate real-time data updates.

Introduction to Databases

In the next section, we will introduce the concept of databases and their advantages over using arrays or text files to store data. Databases offer structured storage, efficient data retrieval, and scalability. We will explore the basics of databases and understand why they are commonly used in web development.

Saving Data to a Database using NeDB

In the final section, we will use a database package called NeDB to save the latitude and longitude data. NeDB is a lightweight, in-memory database that can be easily integrated with Node.js. We will explore how to set up NeDB, create a database, and save the data. By using a database, we can ensure data persistence, efficient querying, and scalability for our application.

Highlights:

  • Learn how to send data from a client to a server
  • Set up routes in the server and modify the Fetch function in the client
  • Use JSON parsing to make the data readable in the server code
  • Handle the response from the server and send a response back to the client
  • Explore different approaches for persisting latitude and longitude data
  • Save data to a text file using the Node file system package
  • Add a button to the HTML page to trigger data sending to the server
  • Understand the advantages of using databases for data storage
  • Use the NeDB database package to save data in an in-memory database
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