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 Local JSON file CRUD Operation using Fetch API in React JS:-


In this article, I am describing, how to create a local JSON server and perform CRUD operation using React-JS Project.

Step1st:

Create React Project 

npx create-react-app projectname

Step 2nd:-

Create db.json file under public folder and write this code

{
  "posts": [
    {
      "id": 1,
      "name": "Satheesh",
      "email": "Sat@mail.com",
      "adderss": "South street"
    },
    {
      "id": 2,
      "name": "John",
      "email": "john@mail.com",
      "adderss": "North street"
    },
    {
      "id": 3,
      "name": "Robert",
      "email": "robert@mail.com",
      "adderss": "East street"
    },
    {
      "id": 4,
      "name": "Mani",
      "email": "mani@mail.com",
      "adderss": "West street"
    }
  ],
  "comments": [
    {
      "id": 1,
      "body": "some comment",
      "postId": 1
    }
  ],
  "profile": {
    "name": "typicode"
  }
}

Step 3rd:-
Install JSON Server under same project
npm install -g Json-server 


Step 4th:-
Open Command Prompt  under public folder and write following command
json-server –-watch db.json --port 3001

Step5th:-

Create Component to Access GET API using Fetch and Write this code

import React from "react";

export default class Restapiget extends React.Component
{
    constructor(props)
    {
        super(props);
        this.state = {tdata:[]}
    }
    componentDidMount() {

        fetch('http://127.0.0.1:3001/posts')

        .then(res => res.json())

        .then((data) => {

          this.setState({ tdata: data })

          console.log(this.state.tdata)

        })

        .catch(console.log)

      }
    render(){
        return(<div>
         <table border='1'>
            <tr><th>UserId</th><th>Name</th><th>Email</th><th>Address</th></tr>
            {this.state.tdata.map((person,i)=>  
             <tr key={i}>
                <td>{person.id}</td>
                <td>{person.name}</td>
                <td>{person.email}</td>
                <td>{person.adderss}</td>
                <td>Edit</td>
                <td>Delete</td>
            </tr>)}  
         </table>
        </div>)
    }
}


Create RESTFUL API for POST
import React from "react";

export default class Restapipost extends React.Component
{
    constructor(props)
    {
        super(props);
        this.state = {tdata:''}
    }
    componentDidMount() {

        fetch('http://127.0.0.1:3001/posts',{
         method: 'POST',
         body: JSON.stringify({
          id:'5',
          name:'mno',
          email:'1023',
          adderss:'Test address'
      }),
         headers:{"content-type":"application/json; charset=UTF-8"}  
          }).then(res => res.json())

    .then((data) => {

       console.log(data)
       this.setState({tdata:data})

    }).catch(console.log)
   }

     
   
    render(){
        return(<div>
           
            <h1>{this.state.tdata.id}</h1>
        </div>)
    }
}

Create RESTFULT API for UPDATE
import React from "react";

export default class Restapiput extends React.Component
{
    constructor(props)
    {
        super(props);
        this.state = {tdata:''}
    }
    componentDidMount() {

        fetch('http://127.0.0.1:3001/posts/'+5,{
         method: 'PUT',
         body: JSON.stringify({
          name:'klmn',
          email:'klmn@gmail.com',
          adderss:'Test address'
      }),
         headers:{"content-type":"application/json; charset=UTF-8"}  
          }).then(res => res.json())

    .then((data) => {

       console.log(data)
       this.setState({tdata:'update success'})

    }).catch(console.log)
   }

     
   
    render(){
        return(<div>
           
            <h1>{this.state.tdata}</h1>
        </div>)
    }
}

Create RESTFULL API for Delete:-



import React from "react";

export default class Restapidelete extends React.Component
{
    constructor(props)
    {
        super(props);
        this.state = {tdata:''}
    }
    componentDidMount() {

        fetch('http://127.0.0.1:3001/posts/'+5,{
         method: 'DELETE'
          });
   }

     
   
    render(){
        return(<div>
           
            <h1>Delete Success</h1>
        </div>)
    }
}







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