React fetch example - GET/POST/PUT/DELETE with API

In this article, we will see how to make an API call to fetch data in react, update the data, create a new record and delete records.

Project setup

First, create a new react app using the following command:

1npx create-react-app react-fetch-get-post-put-delete

Now install BlueprintJS for styling the app.

1npm i @blueprintjs/core

Add the following styles in index.css:

index.css

1@import "~normalize.css";
2@import "~@blueprintjs/core/lib/css/blueprint.css";
3@import "~@blueprintjs/icons/lib/css/blueprint-icons.css";
4
5body {
6  display: flex;
7  justify-content: center;
8}

Here we are including the blueprint styles we installed earlier.

GET: Displaying user data

We will use JSON placeholder for the APIs.

App.js

1import { Button, EditableText } from "@blueprintjs/core"
2import { useEffect, useState } from "react"
3import "./App.css"
4
5function App() {
6  const [users, setUsers] = useState([])
7
8  useEffect(() => {
9    fetch("https://jsonplaceholder.typicode.com/users")
10      .then(response => response.json())
11      .then(json => setUsers(json))
12  }, [])
13
14  return (
15    <div className="App">
16      <table class="bp4-html-table .modifier">
17        <thead>
18          <tr>
19            <th>Id</th>
20            <th>Name</th>
21            <th>Email</th>
22            <th>Website</th>
23            <th>Action</th>
24          </tr>
25        </thead>
26        <tbody>
27          {users.map(user => (
28            <tr key={user.id}>
29              <td>{user.id}</td>
30              <td>{user.name}</td>
31              <td>
32                <EditableText value={user.email} />
33              </td>
34              <td>
35                <EditableText value={user.website} />
36              </td>
37              <td>
38                <Button intent="primary">Update</Button>
39                &nbsp;
40                <Button intent="danger">Delete</Button>
41              </td>
42            </tr>
43          ))}
44        </tbody>
45      </table>
46    </div>
47  )
48}
49
50export default App

In the above code,

We are fetching the list of users inside the useEffect.
Displaying id, name, email, and website of each user.
Have 2 action buttons for updating and deleting the user details.

If you run the app now, you will be able to see the list of users:

POST: Adding new user

App.js

1import "./App.css"
2import { useEffect, useState } from "react"
3import {
4  Button,
5  EditableText,
6  InputGroup,
7  Toaster,
8  Position,
9} from "@blueprintjs/core"
10
11const AppToaster = Toaster.create({
12  position: Position.TOP,
13})
14
15function App() {
16  const [users, setUsers] = useState([])
17  const [newName, setNewName] = useState("")
18  const [newEmail, setNewEmail] = useState("")
19  const [newWebsite, setNewWebsite] = useState("")
20
21  useEffect(() => {
22    fetch("https://jsonplaceholder.typicode.com/users")
23      .then(response => response.json())
24      .then(json => setUsers(json))
25  }, [])
26
27  const addUser = () => {
28    const name = newName.trim()
29    const email = newEmail.trim()
30    const website = newWebsite.trim()
31    if (name && email && website) {
32      fetch("https://jsonplaceholder.typicode.com/users", {
33        method: "POST",
34        body: JSON.stringify({
35          name,
36          email,
37          website,
38        }),
39        headers: {
40          "Content-type": "application/json; charset=UTF-8",
41        },
42      })
43        .then(response => response.json())
44        .then(data => {
45          setUsers([...users, data])
46          setNewName("")
47          setNewEmail("")
48          setNewWebsite("")
49          AppToaster.show({
50            message: "User added successfully",
51            intent: "success",
52            timeout: 3000,
53          })
54        })
55    }
56  }
57
58  return (
59    <div className="App">
60      <table class="bp4-html-table .modifier">
61        <thead>
62          <tr>
63            <th>Id</th>
64            <th>Name</th>
65            <th>Email</th>
66            <th>Website</th>
67            <th>Action</th>
68          </tr>
69        </thead>
70        <tbody>
71          {users.map(user => (
72            <tr key={user.id}>
73              <td>{user.id}</td>
74              <td>{user.name}</td>
75              <td>
76                <EditableText value={user.email} />
77              </td>
78              <td>
79                <EditableText value={user.website} />
80              </td>
81              <td>
82                <Button intent="primary">Update</Button>
83                &nbsp;
84                <Button intent="danger">Delete</Button>
85              </td>
86            </tr>
87          ))}
88        </tbody>
89        <tfoot>
90          <tr>
91            <td></td>
92            <td>
93              <InputGroup
94                value={newName}
95                onChange={e => setNewName(e.target.value)}
96                placeholder="Add name here..."
97              />
98            </td>
99            <td>
100              <InputGroup
101                placeholder="Add email here..."
102                value={newEmail}
103                onChange={e => setNewEmail(e.target.value)}
104              />
105            </td>
106            <td>
107              <InputGroup
108                placeholder="Add website here..."
109                value={newWebsite}
110                onChange={e => setNewWebsite(e.target.value)}
111              />
112            </td>
113            <td>
114              <Button intent="success" onClick={addUser}>
115                Add user
116              </Button>
117            </td>
118          </tr>
119        </tfoot>
120      </table>
121    </div>
122  )
123}
124
125export default App

In the above code,

We have introduced 3 new local states to store name, email, and website.
We have added input fields to read name, email, and website.
We have a button with the label 'Add user', when clicked will call the addUser function.
The addUser function will check if all the values are present, and will call the add user API, which uses the HTTP POST method.
Once the user is added successfully, we append the user to the existing users and display a success message.

If you run the application now, you should be able to add a new user.

PUT: Updating user data

We will use the HTTP PUT method to update the data:

1import "./App.css"
2import { useEffect, useState } from "react"
3import {
4  Button,
5  EditableText,
6  InputGroup,
7  Toaster,
8  Position,
9} from "@blueprintjs/core"
10
11const AppToaster = Toaster.create({
12  position: Position.TOP,
13})
14
15function App() {
16  const [users, setUsers] = useState([])
17  const [newName, setNewName] = useState("")
18  const [newEmail, setNewEmail] = useState("")
19  const [newWebsite, setNewWebsite] = useState("")
20
21  useEffect(() => {
22    fetch("https://jsonplaceholder.typicode.com/users")
23      .then(response => response.json())
24      .then(json => setUsers(json))
25  }, [])
26
27  const addUser = () => {
28    const name = newName.trim()
29    const email = newEmail.trim()
30    const website = newWebsite.trim()
31    if (name && email && website) {
32      fetch("https://jsonplaceholder.typicode.com/users", {
33        method: "POST",
34        body: JSON.stringify({
35          name,
36          email,
37          website,
38        }),
39        headers: {
40          "Content-type": "application/json; charset=UTF-8",
41        },
42      })
43        .then(response => response.json())
44        .then(data => {
45          setUsers([...users, data])
46          setNewName("")
47          setNewEmail("")
48          setNewWebsite("")
49          AppToaster.show({
50            message: "User added successfully",
51            intent: "success",
52            timeout: 3000,
53          })
54        })
55    }
56  }
57
58  const updateUser = id => {
59    const user = users.find(user => user.id === id)
60
61    fetch(`https://jsonplaceholder.typicode.com/users/${id}`, {
62      method: "PUT",
63      body: JSON.stringify(user),
64      headers: {
65        "Content-type": "application/json; charset=UTF-8",
66      },
67    })
68      .then(response => response.json())
69      .then(() => {
70        AppToaster.show({
71          message: "User updated successfully",
72          intent: "success",
73          timeout: 3000,
74        })
75      })
76  }
77
78  const onChangeHandler = (id, key, value) => {
79    setUsers(values => {
80      return values.map(item =>
81        item.id === id ? { ...item, [key]: value } : item
82      )
83    })
84  }
85
86  return (
87    <div className="App">
88      <table class="bp4-html-table .modifier">
89        <thead>
90          <tr>
91            <th>Id</th>
92            <th>Name</th>
93            <th>Email</th>
94            <th>Website</th>
95            <th>Action</th>
96          </tr>
97        </thead>
98        <tbody>
99          {users.map(user => (
100            <tr key={user.id}>
101              <td>{user.id}</td>
102              <td>{user.name}</td>
103              <td>
104                <EditableText
105                  value={user.email}
106                  onChange={value => onChangeHandler(user.id, "email", value)}
107                />
108              </td>
109              <td>
110                <EditableText
111                  value={user.website}
112                  onChange={value => onChangeHandler(user.id, "website", value)}
113                />
114              </td>
115              <td>
116                <Button intent="primary" onClick={() => updateUser(user.id)}>
117                  Update
118                </Button>
119                &nbsp;
120                <Button intent="danger">Delete</Button>
121              </td>
122            </tr>
123          ))}
124        </tbody>
125        <tfoot>
126          <tr>
127            <td></td>
128            <td>
129              <InputGroup
130                value={newName}
131                onChange={e => setNewName(e.target.value)}
132                placeholder="Add name here..."
133              />
134            </td>
135            <td>
136              <InputGroup
137                placeholder="Add email here..."
138                value={newEmail}
139                onChange={e => setNewEmail(e.target.value)}
140              />
141            </td>
142            <td>
143              <InputGroup
144                placeholder="Add website here..."
145                value={newWebsite}
146                onChange={e => setNewWebsite(e.target.value)}
147              />
148            </td>
149            <td>
150              <Button intent="success" onClick={addUser}>
151                Add user
152              </Button>
153            </td>
154          </tr>
155        </tfoot>
156      </table>
157    </div>
158  )
159}
160
161export default App

In the above code,

We have a function onChangeHandler, which will be called whenever the email and website are edited.
When the user clicks on the update button we are calling the updateUser function and passing the user id to it.
In the updateUser method, we are filtering the user based on the id passed and calling the API with the PUT method to update the user data to API.
On successful update, we are displaying a success message.

JSONPlaceholder will not actually update or delete the data. It will just respond as if they are done.

DELETE: Deleting user

We will use the HTTP DELETE method to delete a user record.

1import "./App.css"
2import { useEffect, useState } from "react"
3import {
4  Button,
5  EditableText,
6  InputGroup,
7  Toaster,
8  Position,
9} from "@blueprintjs/core"
10
11const AppToaster = Toaster.create({
12  position: Position.TOP,
13})
14
15function App() {
16  const [users, setUsers] = useState([])
17  const [newName, setNewName] = useState("")
18  const [newEmail, setNewEmail] = useState("")
19  const [newWebsite, setNewWebsite] = useState("")
20
21  useEffect(() => {
22    fetch("https://jsonplaceholder.typicode.com/users")
23      .then(response => response.json())
24      .then(json => setUsers(json))
25  }, [])
26
27  const addUser = () => {
28    const name = newName.trim()
29    const email = newEmail.trim()
30    const website = newWebsite.trim()
31    if (name && email && website) {
32      fetch("https://jsonplaceholder.typicode.com/users", {
33        method: "POST",
34        body: JSON.stringify({
35          name,
36          email,
37          website,
38        }),
39        headers: {
40          "Content-type": "application/json; charset=UTF-8",
41        },
42      })
43        .then(response => response.json())
44        .then(data => {
45          setUsers([...users, data])
46          setNewName("")
47          setNewEmail("")
48          setNewWebsite("")
49          AppToaster.show({
50            message: "User added successfully",
51            intent: "success",
52            timeout: 3000,
53          })
54        })
55    }
56  }
57
58  const updateUser = id => {
59    const user = users.find(user => user.id === id)
60
61    fetch(`https://jsonplaceholder.typicode.com/users/${id}`, {
62      method: "PUT",
63      body: JSON.stringify(user),
64      headers: {
65        "Content-type": "application/json; charset=UTF-8",
66      },
67    })
68      .then(response => response.json())
69      .then(() => {
70        AppToaster.show({
71          message: "User updated successfully",
72          intent: "success",
73          timeout: 3000,
74        })
75      })
76  }
77
78  const deleteUser = id => {
79    fetch(`https://jsonplaceholder.typicode.com/posts/${id}`, {
80      method: "DELETE",
81    })
82      .then(response => response.json())
83      .then(() => {
84        setUsers(values => {
85          return values.filter(item => item.id !== id)
86        })
87        AppToaster.show({
88          message: "User deleted successfully",
89          intent: "success",
90          timeout: 3000,
91        })
92      })
93  }
94
95  const onChangeHandler = (id, key, value) => {
96    setUsers(values => {
97      return values.map(item =>
98        item.id === id ? { ...item, [key]: value } : item
99      )
100    })
101  }
102
103  return (
104    <div className="App">
105      <table class="bp4-html-table .modifier">
106        <thead>
107          <tr>
108            <th>Id</th>
109            <th>Name</th>
110            <th>Email</th>
111            <th>Website</th>
112            <th>Action</th>
113          </tr>
114        </thead>
115        <tbody>
116          {users.map(user => (
117            <tr key={user.id}>
118              <td>{user.id}</td>
119              <td>{user.name}</td>
120              <td>
121                <EditableText
122                  value={user.email}
123                  onChange={value => onChangeHandler(user.id, "email", value)}
124                />
125              </td>
126              <td>
127                <EditableText
128                  value={user.website}
129                  onChange={value => onChangeHandler(user.id, "website", value)}
130                />
131              </td>
132              <td>
133                <Button intent="primary" onClick={() => updateUser(user.id)}>
134                  Update
135                </Button>
136                &nbsp;
137                <Button intent="danger" onClick={() => deleteUser(user.id)}>
138                  Delete
139                </Button>
140              </td>
141            </tr>
142          ))}
143        </tbody>
144        <tfoot>
145          <tr>
146            <td></td>
147            <td>
148              <InputGroup
149                value={newName}
150                onChange={e => setNewName(e.target.value)}
151                placeholder="Add name here..."
152              />
153            </td>
154            <td>
155              <InputGroup
156                placeholder="Add email here..."
157                value={newEmail}
158                onChange={e => setNewEmail(e.target.value)}
159              />
160            </td>
161            <td>
162              <InputGroup
163                placeholder="Add website here..."
164                value={newWebsite}
165                onChange={e => setNewWebsite(e.target.value)}
166              />
167            </td>
168            <td>
169              <Button intent="success" onClick={addUser}>
170                Add user
171              </Button>
172            </td>
173          </tr>
174        </tfoot>
175      </table>
176    </div>
177  )
178}
179
180export default App

In the code above,

We have added the deleteUser function, which will be called when the user clicks on the Delete button.
The deleteUser function will receive the id of the user to be deleted and will call the API with the HTTP DELETE method.
Once the user is deleted, it will remove the particular user from the users state and display a success message.

Source code and Demo

You can view the complete source code here and a demo here.

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React fetch example - GET/POST/PUT/DELETE with API

Table of Contents

Project setup

GET: Displaying user data

POST: Adding new user

PUT: Updating user data

DELETE: Deleting user

Source code and Demo

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