How to install JSON Server in Ubuntu 24.04 LTS Linux

If you want to create a mock RESTful API to test your front-end code without setting up a full back-end environment then a JSON server will help you a lot. In this tutorial, we will learn commands to not only install the JSON server on Ubuntu 24.04 Linux but even how to use it with an example.

What is a JSON server?

JSON Server is an open-source tool developed to provide a fake REST API back-end for prototyping and mocking using a JSON file but without performing any coding. It allows front-end developers to test their code quickly instead of setting a full back-end environment before actually going for the final deployment of a project. JSON Server provides all the typical RESTful routes, allowing for CRUD (Create, Read, Update, Delete) operations. The best part is it can be installed using Nodejs NPM, and can be used on almost all operating systems.

What do we need to perform this tutorial?

  • Ubuntu 24.04 LTS Linux system or any other version of it such as Ubuntu 20.04, 22.04, or 23.04.
  • Access to the root user or any other with sudo rights.
  • Availability of an active internet connection

Step 1: Access Ubuntu 24.04 Terminal

Open the command terminal on your Ubuntu system and run the system update command along with the installation of cURL.

sudo apt update && sudo apt upgrade && sudo apt install curl

Step 2: Install Node.js and npm

First, we need to install Nodejs on our Ubuntu 24.04 server or desktop because JSON Server is built on Node.js. Well, to get the latest LTS version of Node we need to add its official repository manually, here is the command to do that.

The default version of Nodejs available through the Ubuntu 24.04 system repository is 18.x, if you want to use that then simply type: “sudo apt install nodejs

Whereas those who want the latest available LTS version of Nodejs, need to add its repository manually. For example, while doing this article the latest LTS version was 20.x, therefore, to get it, use the given command:

curl -fsSL | sudo -E bash -

Install Nodejs and NPM:

After adding this repository run the installation command, it will configure the Node.js along with npm (Node Package Manager).

sudo apt install nodejs

Verify the installation:

node -v
npm -v
Installing NodeJs and NPM on UIbuntu 24.04

Step 3: Install JSON Server on Ubuntu 24.04

Now that we have the Node.js along with its package manager NPM on Ubuntu 24.04, the installation of JSON Server can easily be done using NPM, here is the command to follow:

sudo npm install -g json-server

To verify the installation of the JSON Server, run:

json-server --version
Check JSON Server version

Example: How to use JSON Server

JSON Server uses a simple JSON file to serve as a database. Create a sample JSON file named db.json in your desired directory. For this tutorial, we’ll create a simple database for users and posts.

Create a JSON File

Create a directory for your project:

mkdir ~/json-server
cd ~/json-server

Create the db.json file:

nano db.json

Add the following sample data:

  "users": [
    { "id": 1, "name": "John Doe" },
    { "id": 2, "name": "Jane Doe" }
  "posts": [
    { "id": 1, "title": "Hello World", "author": "John Doe" },
    { "id": 2, "title": "JSON Server Rocks", "author": "Jane Doe" }

Save the file and exit the text editor (for nano, press CTRL + X, then Y, and Enter).

Step 5: Start JSON Server

To start the JSON Server, navigate to the directory containing your db.json file and run:

json-server --watch db.json

This command starts a JSON Server that watches the db.json file for changes. By default, the server runs on port 3000. You should see the output as given in the screenshot:

Start JSON Server

Access the API

Open a web browser or use a tool like Curl or Postman to access the API endpoints. You can use the URLs provided in the terminal output.

For example, to get the list of users, navigate to:

JSON Server Localhost port 3000

To get the list of posts, navigate to:

get the list of users JSON server


With minimal setup, JSON Server is a quite useful tool for mocking REST APIs quickly and easily. Front-end developers can focus on their projects and their testing without waiting for back-end services to be ready.

Other Articles:

Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.