Using JSON Server to implement Mock data in Vue project

In the development of Vue projects, Mock data is an essential part. Mock data can simulate the data returned by the server, so that in the early stages of development or when there is no server, we can achieve rapid iteration without interrupting the development process. This article will introduce how to use JSON Server to implement Mock data in the Vue project.

1. Introduction to JSON Server

JSON Server is a tool used to quickly build a RESTful API. This tool can automatically generate an API based on a JSON file. The installation of JSON Server is relatively simple. We can use npm to install it, as shown below:

npm install -g json-server

After the installation is completed, we can create a db.json file in the project root directory and write in the file We need simulated data. The format of the db.json file is as follows:

{
  "posts": [
    { "id": 1, "title": "json-server", "author": "typicode" },
    { "id": 2, "title": "Vue.js", "author": "Evan You" }
  ],
  "comments": [
    { "id": 1, "body": "some comment", "postId": 1 },
    { "id": 2, "body": "some other comment", "postId": 2 }
  ]
}

In this example, we define two objects: posts and comments, which can be used in POST and GET requests.

2. Using JSON Server in Vue projects

Using JSON Server in Vue projects is very simple. We can add a script to start json-server in package.json. As shown below:

"scripts": {
  "json-server": "json-server --watch db.json"
},

Then we use the following command in the terminal to start json-server:

npm run json-server

Access http://localhost:3000/posts, we can get the mock data.

3. Using API in Vue project

We can initiate API requests provided by JSON Server through the Axios library. We need to install the Axios library in the project as follows:

npm install axios --save

The code example of using Axios to send a request is as follows:

import axios from 'axios';

const BASE_URL = 'http://localhost:3000/';

axios.defaults.baseURL = BASE_URL;

export function getPosts() {
  return axios.get('posts').then((res) => {
    return res.data;
  });
}

export function getPostById(id) {
  return axios.get(`posts/${id}`).then((res) => {
    return res.data;
  });
}

export function addPost(post) {
  return axios.post('posts', post).then((res) => {
    return res.data;
  });
}

export function updatePost(id, post) {
  return axios.put(`posts/${id}`, post).then((res) => {
    return res.data;
  });
}

export function deletePost(id) {
  return axios.delete(`posts/${id}`).then((res) => {
    return res.data;
  });
}

In this example, we expose many API functions, Including getting all articles, getting single articles, creating articles, updating articles, deleting articles, etc. You can define these APIs according to your needs.

The code example for using these APIs in the Vue component is as follows:

<template>
  <ul>
    <li v-for="post in posts" :key="post.id">
      {{ post.title }}
    </li>
  </ul>
</template>

<script>
import { getPosts } from '@/api';

export default {
  data() {
    return {
      posts: [],
    };
  },
  created() {
    this.fetchData();
  },
  methods: {
    fetchData() {
      getPosts().then((data) => {
        this.posts = data;
      });
    },
  },
};
</script>

In this example, we bind the API for getting all articles to the created method. When the component is created This method will be triggered when. Call the API in the method to obtain the data, and finally bind the data to the posts attribute so that it can be rendered in the component's template.

So far, we have successfully used JSON Server to implement Mock data in the Vue project, and used Axios to send API requests provided by JSON Server. This allows us to develop and test projects independently, making development more efficient.

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