Reactjs - why DELETE METHOD is not working in MERN STACK blog application?

MurtazaAbdullah
January 22, 2024
236 views
0 votes
2 Answers

In my blog site everything is okay but the Delete is not working and it’s saying : 401 invalid JWT

I think everything is okay and its still doing all the other jobs perfectly like the edit blog or create blog. And I don’t think I should get any error. Even It”s sending the request to the server.

my BlogDetails.jsx::

import { useContext, useEffect, useState } from "react";
import { useParams, Link } from "react-router-dom/cjs/react-router-dom.min";
import '../CSS/details.css';
import {format} from'date-fns';
import { UserContext } from "../UserContext";
import { useHistory } from "react-router-dom/cjs/react-router-dom.min";

const BlogDetails = () => {
    const history = useHistory();
    const {id} = useParams();
    const [blogInfo, setBlogInfo] = useState(null);
    const [redirect, setRedirect] = useState(false);
    const {userInfo} = useContext(UserContext);

    useEffect(() => {
        fetch(`http://localhost:4000/blogs/${id}`)
            .then((response) => {
                response.json()
                    .then(blogInfo => {
                        setBlogInfo(blogInfo);
                        console.log(blogInfo);
                    })
            })
    }, [id]);

    const handleDelete = async () => {
        try {
            const response = await fetch(`http://localhost:4000/blogs/${id}`, {
                method: 'DELETE',
            });
    
            if (response.ok) {
                setRedirect(true);
            } else {
                console.error('Failed to delete the blog:', response.status);
            }
        } catch (error) {
            console.error('Error during delete request:', error);
        }
    };
    

    if (!blogInfo) return '';
    if(redirect) {
        history.push('/')
    }
    return (  
        <div className="blog-details">
            <div className="title">
                <h1>{blogInfo.title}</h1>
            </div>
            <div className="date">
                <time>First Published On {format(new Date(blogInfo.createdAt), 'MMM d, yyyy  h:mm:ss aa')}</time>
                <br />
                <time>Last Updated On {format(new Date(blogInfo.updatedAt), 'MMM d, yyyy h:mm aa')}</time>
            </div>
            <div className="edit">
                {userInfo.id === blogInfo.author._id && (
                    <div className="buttons">
                        <button><Link to={`/edit/${blogInfo._id}`}>Edit This Blog</Link></button>
                        <button onClick={handleDelete}>Delete This Blog</button>
                    </div>
                )} 
            </div>
            <div className="author">
                <p>by @{blogInfo.author.username}</p>
            </div>
            <div className="image">
                <img src={`http://localhost:4000/${blogInfo.file}`} alt="" />
            </div>
            <div className="content">
                <div dangerouslySetInnerHTML={{__html:blogInfo.content}}></div>
            </div>
        </div> 
    );
}
 
export default BlogDetails;

index.js:

const express = require('express');
const cors = require('cors');
const { default: mongoose } = require('mongoose');
const User = require('./models/User');
const Blog = require('./models/Blog')
const bcrypt = require('bcrypt');
const jwt = require('jsonwebtoken');
const cookieparser = require('cookie-parser');
const multer = require('multer');
const uploadMiddleware = multer({ dest: 'uploads/' });
const fs = require('fs');

const saltRounds = 10;
const secret = 'hdskjfj49353kjdfsdjf';
const app = express();

mongoose.connect('mongodb://127.0.0.1:27017/BLOGAPP').then(()=> {
    console.log('Connected to mongo DB');
    app.listen(4000)
}).catch(err => {
    console.log(err);
})

app.use(cors({
    credentials: true,
    origin: 'http://localhost:3000'
}));

app.use(express.json());
app.use(cookieparser());
app.use(express.urlencoded({extended : true}))
app.use('/uploads', express.static(__dirname + '/uploads'))

app.post('/signup', (req, res)=> {
    const {username, password} = req.body;
    const user = new User ({
        username, 
        password:bcrypt.hashSync(password, saltRounds)
    });
    user.save()
    .then((result) => {
        console.log(result);
        res.status(200).json({ message: 'Registration successful' });
    })
    .catch((err) => {
        console.error(err);
        res.status(500).json({ message: 'Internal Server Error' });
    });
});

app.post('/signin', async (req, res) => {
    const { username, password } = req.body;
    const user = await User.findOne({ username });

    if (!user) {
        // User not found
        res.status(400).json('User not found');
        return;
    }
    const passOk = bcrypt.compareSync(password, user.password);
    if (passOk) {
        jwt.sign({ username, id: user._id }, secret, (err, token) => {
            if (err) {
                console.error(err);
                res.status(500).json({ message: 'Internal Server Error' });
            } else {
                res.cookie('token', token).json({
                    id: user._id,
                    username,
                })               
            }
        });
    } else {
        res.status(400).json('Wrong credentials');
    }
});


app.post('/logout', (req, res)=> {
    res.cookie('token', '').json('ok')
})

app.get('/blogs', async (req, res) => {
    try {
        const blogs = await Blog.find()
            .populate('author', 'username')
            .sort({createdAt : -1})
            .limit(20);
            res.json(blogs);
    } catch (err) {
        console.log(err);
        res.status(500).json({ message: 'Internal Server Error' });
    }
});
app.get('/profile', (req, res) => {
    const { token } = req.cookies;

    if (!token) {
        // Token not provided
        res.status(401).json({ message: 'JWT must be provided' });
        return;
    }

    jwt.verify(token, secret, {}, (err, info) => {
        if (err) {
            // Invalid token
            res.status(401).json({ message: 'Invalid JWT' });
        } else {
            res.json(info);
        }
    });
});


app.post('/new_blog', uploadMiddleware.single('file'), async (req, res) => {
    const {originalname, path} = req.file;
    const part = originalname.split(".");
    const ext = part[part.length -1];
    const newPath = path+'.'+ext;
    fs.renameSync(path, newPath);

    // Check if token exists
    const { token } = req.cookies;
    if (!token) {
        res.status(401).json({ message: 'JWT must be provided' });
        return;
    }

    jwt.verify(token, secret, {}, async (err, info) => {
        if (err) {
            res.status(401).json({ message: 'Invalid JWT' });
            return;
        }

        const { title, snippet, content } = req.body;

        const blog = new Blog({
            title,
            snippet,
            content,
            file: newPath,
            author: info.id,
        });

        try {
            // Save the blog and wait for the promise to resolve
            const savedBlog = await blog.save();
            res.json(savedBlog);
        } catch (error) {
            console.error(error);
            res.status(500).json({ message: 'Internal Server Error' });
        }
    });
});

app.get('/blogs/:id', async (req, res) => {
    const { id } = req.params;
    const Details = await Blog.findById(id).populate('author', ["username"]);

    if (!Details) {
        return res.status(404).json({ error: 'Blog not found' });
    }
    res.json(Details);
});

app.put('/blogs/:id', uploadMiddleware.single('file'), async (req, res) => {
    const { id } = req.params;
    const newPath = req.file ? req.file.path : null;

    const { token } = req.cookies;

    jwt.verify(token, secret, {}, async (err, info) => {
        if (err) {
            res.status(401).json({ message: 'Invalid JWT' });
            return;
        }

        try {
            const { title, content, snippet } = req.body;
            const blog = await Blog.findById(id);

            if (!blog) {
                res.status(404).json({ message: 'Blog not found' });
                return;
            }

            const isAuthor = blog.author.toString() === info.id;

            if (!isAuthor) {
                res.status(403).json({ message: 'You are not the author' });
                return;
            }

            blog.title = title;
            blog.content = content;
            blog.snippet = snippet;

            if (newPath) {
                blog.file = newPath;
            }

            const updatedBlog = await blog.save();
            res.json(updatedBlog);
        } catch (error) {
            console.error(error);
            res.status(500).json({ message: 'Internal Server Error' });
        }
    });
});

app.delete('/blogs/:id', async (req, res) => {
    const { id } = req.params;

    try {
        const blog = await Blog.findById(id);

        if (!blog) {
            return res.status(404).json({ message: 'Blog not found' });
        }

        const { token } = req.cookies;

        jwt.verify(token, secret, {}, async (err, info) => {
            if (err) {
                return res.status(401).json({ message: 'Invalid JWT' });
            }

            const isAuthor = blog.author.toString() === info.id;

            if (!isAuthor) {
                return res.status(403).json({ message: 'You are not the author' });
            }

            // Remove the associated file (if it exists)
            if (blog.file) {
                fs.unlinkSync(blog.file);
            }

            await Blog.findByIdAndDelete(id);
            return res.json({ message: 'Blog deleted successfully' });
        });
    } catch (error) {
        console.error(error);
        return res.status(500).json({ message: 'Internal Server Error' });
    }
});
app.delete('/blogs/:id', async (req, res) => {
    const { id } = req.params;

    try {
        const blog = await Blog.findById(id);

        if (!blog) {
            return res.status(404).json({ message: 'Blog not found' });
        }

        const { token } = req.cookies;

        jwt.verify(token, secret, {}, async (err, info) => {
            if (err) {
                console.error('JWT Verification Error:', err);
                return res.status(401).json({ message: 'Invalid JWT' });
            }
            console.log('JWT Verified Successfully:', info);
            const isAuthor = blog.author.toString() === info.id;

            if (!isAuthor) {
                return res.status(403).json({ message: 'You are not the author' });
            }

            // Remove the associated file (if it exists)
            if (blog.file) {
                fs.unlinkSync(blog.file);
            }

            await Blog.findByIdAndDelete(id);
            return res.json({ message: 'Blog deleted successfully' });
        });
    } catch (error) {
        console.error(error);
        return res.status(500).json({ message: 'Internal Server Error' });
    }
});

const express = require('express');
const cors = require('cors');
const { default: mongoose } = require('mongoose');
const User = require('./models/User');
const Blog = require('./models/Blog')
const bcrypt = require('bcrypt');
const jwt = require('jsonwebtoken');
const cookieparser = require('cookie-parser');
const multer = require('multer');
const uploadMiddleware = multer({ dest: 'uploads/' });
const fs = require('fs');

const saltRounds = 10;
const secret = 'hdskjfj49353kjdfsdjf';
const app = express();

mongoose.connect('mongodb://127.0.0.1:27017/BLOGAPP').then(()=> {
    console.log('Connected to mongo DB');
    app.listen(4000)
}).catch(err => {
    console.log(err);
})

app.use(cors({
    credentials: true,
    origin: 'http://localhost:3000'
}));

app.use(express.json());
app.use(cookieparser());
app.use(express.urlencoded({extended : true}))
app.use('/uploads', express.static(__dirname + '/uploads'))

app.post('/signup', (req, res)=> {
    const {username, password} = req.body;
    const user = new User ({
        username, 
        password:bcrypt.hashSync(password, saltRounds)
    });
    user.save()
    .then((result) => {
        console.log(result);
        res.status(200).json({ message: 'Registration successful' });
    })
    .catch((err) => {
        console.error(err);
        res.status(500).json({ message: 'Internal Server Error' });
    });
});

app.post('/signin', async (req, res) => {
    const { username, password } = req.body;
    const user = await User.findOne({ username });

    if (!user) {
        // User not found
        res.status(400).json('User not found');
        return;
    }
    const passOk = bcrypt.compareSync(password, user.password);
    if (passOk) {
        jwt.sign({ username, id: user._id }, secret, (err, token) => {
            if (err) {
                console.error(err);
                res.status(500).json({ message: 'Internal Server Error' });
            } else {
                res.cookie('token', token).json({
                    id: user._id,
                    username,
                })               
            }
        });
    } else {
        res.status(400).json('Wrong credentials');
    }
});


app.post('/logout', (req, res)=> {
    res.cookie('token', '').json('ok')
})

app.get('/blogs', async (req, res) => {
    try {
        const blogs = await Blog.find()
            .populate('author', 'username')
            .sort({createdAt : -1})
            .limit(20);
            res.json(blogs);
    } catch (err) {
        console.log(err);
        res.status(500).json({ message: 'Internal Server Error' });
    }
});
app.get('/profile', (req, res) => {
    const { token } = req.cookies;

    if (!token) {
        // Token not provided
        res.status(401).json({ message: 'JWT must be provided' });
        return;
    }

    jwt.verify(token, secret, {}, (err, info) => {
        if (err) {
            // Invalid token
            res.status(401).json({ message: 'Invalid JWT' });
        } else {
            res.json(info);
        }
    });
});


app.post('/new_blog', uploadMiddleware.single('file'), async (req, res) => {
    const {originalname, path} = req.file;
    const part = originalname.split(".");
    const ext = part[part.length -1];
    const newPath = path+'.'+ext;
    fs.renameSync(path, newPath);

    // Check if token exists
    const { token } = req.cookies;
    if (!token) {
        res.status(401).json({ message: 'JWT must be provided' });
        return;
    }

    jwt.verify(token, secret, {}, async (err, info) => {
        if (err) {
            res.status(401).json({ message: 'Invalid JWT' });
            return;
        }

        const { title, snippet, content } = req.body;

        const blog = new Blog({
            title,
            snippet,
            content,
            file: newPath,
            author: info.id,
        });

        try {
            // Save the blog and wait for the promise to resolve
            const savedBlog = await blog.save();
            res.json(savedBlog);
        } catch (error) {
            console.error(error);
            res.status(500).json({ message: 'Internal Server Error' });
        }
    });
});

app.get('/blogs/:id', async (req, res) => {
    const { id } = req.params;
    const Details = await Blog.findById(id).populate('author', ["username"]);

    if (!Details) {
        return res.status(404).json({ error: 'Blog not found' });
    }
    res.json(Details);
});

app.put('/blogs/:id', uploadMiddleware.single('file'), async (req, res) => {
    const { id } = req.params;
    const newPath = req.file ? req.file.path : null;

    const { token } = req.cookies;

    jwt.verify(token, secret, {}, async (err, info) => {
        if (err) {
            res.status(401).json({ message: 'Invalid JWT' });
            return;
        }

        try {
            const { title, content, snippet } = req.body;
            const blog = await Blog.findById(id);

            if (!blog) {
                res.status(404).json({ message: 'Blog not found' });
                return;
            }

            const isAuthor = blog.author.toString() === info.id;

            if (!isAuthor) {
                res.status(403).json({ message: 'You are not the author' });
                return;
            }

            blog.title = title;
            blog.content = content;
            blog.snippet = snippet;

            if (newPath) {
                blog.file = newPath;
            }

            const updatedBlog = await blog.save();
            res.json(updatedBlog);
        } catch (error) {
            console.error(error);
            res.status(500).json({ message: 'Internal Server Error' });
        }
    });
});

app.delete('/blogs/:id', async (req, res) => {
    const { id } = req.params;

    try {
        const blog = await Blog.findById(id);

        if (!blog) {
            return res.status(404).json({ message: 'Blog not found' });
        }

        const { token } = req.cookies;

        jwt.verify(token, secret, {}, async (err, info) => {
            if (err) {
                return res.status(401).json({ message: 'Invalid JWT' });
            }

            const isAuthor = blog.author.toString() === info.id;

            if (!isAuthor) {
                return res.status(403).json({ message: 'You are not the author' });
            }

            // Remove the associated file (if it exists)
            if (blog.file) {
                fs.unlinkSync(blog.file);
            }

            await Blog.findByIdAndDelete(id);
            return res.json({ message: 'Blog deleted successfully' });
        });
    } catch (error) {
        console.error(error);
        return res.status(500).json({ message: 'Internal Server Error' });
    }
});
app.delete('/blogs/:id', async (req, res) => {
    const { id } = req.params;

    try {
        const blog = await Blog.findById(id);

        if (!blog) {
            return res.status(404).json({ message: 'Blog not found' });
        }

        const { token } = req.cookies;

        jwt.verify(token, secret, {}, async (err, info) => {
            if (err) {
                console.error('JWT Verification Error:', err);
                return res.status(401).json({ message: 'Invalid JWT' });
            }
            console.log('JWT Verified Successfully:', info);
            const isAuthor = blog.author.toString() === info.id;

            if (!isAuthor) {
                return res.status(403).json({ message: 'You are not the author' });
            }

            // Remove the associated file (if it exists)
            if (blog.file) {
                fs.unlinkSync(blog.file);
            }

            await Blog.findByIdAndDelete(id);
            return res.json({ message: 'Blog deleted successfully' });
        });
    } catch (error) {
        console.error(error);
        return res.status(500).json({ message: 'Internal Server Error' });
    }
});

I am trying to create a DELETE method for my blog site but it’s not working

Answers

Chosen as BEST ANSWER

Have to add

credentials : 'include',

to the fetch() request Here is the updated code:

    import { useContext, useEffect, useState } from "react";
import { useParams, Link } from "react-router-dom/cjs/react-router-dom.min";
import '../CSS/details.css';
import {format} from'date-fns';
import { UserContext } from "../UserContext";
import { useHistory } from "react-router-dom/cjs/react-router-dom.min";

const BlogDetails = () => {
    const history = useHistory();
    const {id} = useParams();
    const [blogInfo, setBlogInfo] = useState(null);
    const [redirect, setRedirect] = useState(false);
    const {userInfo} = useContext(UserContext);

    useEffect(() => {
        fetch(`http://localhost:4000/blogs/${id}`)
            .then((response) => {
                response.json()
                    .then(blogInfo => {
                        setBlogInfo(blogInfo);
                        console.log(blogInfo);
                    })
            })
    }, [id]);

    const handleDelete = async () => {
        try {
            const response = await fetch(`http://localhost:4000/blogs/${id}`, {
                method: 'DELETE',
                credentials: "include",
            });
    
            if (response.ok) {
                setRedirect(true);
            } else {
                console.error('Failed to delete the blog:', response.status);
            }
        } catch (error) {
            console.error('Error during delete request:', error);
        }
    };
    

    if (!blogInfo) return '';
    if(redirect) {
        history.push('/')
    }
    return (  
        <div className="blog-details">
            <div className="title">
                <h1>{blogInfo.title}</h1>
            </div>
            <div className="date">
                <time>First Published On {format(new Date(blogInfo.createdAt), 'MMM d, yyyy  h:mm:ss aa')}</time>
                <br />
                <time>Last Updated On {format(new Date(blogInfo.updatedAt), 'MMM d, yyyy h:mm aa')}</time>
            </div>
            <div className="edit">
                {userInfo.id === blogInfo.author._id && (
                    <div className="buttons">
                        <button><Link to={`/edit/${blogInfo._id}`}>Edit This Blog</Link></button>
                        <button onClick={handleDelete}>Delete This Blog</button>
                    </div>
                )} 
            </div>
            <div className="author">
                <p>by @{blogInfo.author.username}</p>
            </div>
            <div className="image">
                <img src={`http://localhost:4000/${blogInfo.file}`} alt="" />
            </div>
            <div className="content">
                <div dangerouslySetInnerHTML={{__html:blogInfo.content}}></div>
            </div>
        </div> 
    );
}
 
export default BlogDetails;

(Edit)

It seems that there are multiple instances of the DELETE route for ‘/blogs/:id’ in your code. The issue may be related to the fact that the second and third instances of the route handler override the first one.

You may try to Remove the redundant code and keep only one instance of the DELETE route handler. Here’s the corrected code:

app.delete('/blogs/:id', async (req, res) => {
    const { id } = req.params;

    try {
        const blog = await Blog.findById(id);

        if (!blog) {
            return res.status(404).json({ message: 'Blog not found' });
        }

        const { token } = req.cookies;

        jwt.verify(token, secret, {}, async (err, info) => {
            if (err) {
                console.error('JWT Verification Error:', err);
                return res.status(401).json({ message: 'Invalid JWT' });
            }

            const isAuthor = blog.author.toString() === info.id;

            if (!isAuthor) {
                return res.status(403).json({ message: 'You are not the author' });
            }

            // Remove the associated file (if it exists)
            if (blog.file) {
                fs.unlinkSync(blog.file);
            }

            await Blog.findByIdAndDelete(id);
            return res.json({ message: 'Blog deleted successfully' });
        });
    } catch (error) {
        console.error(error);
        return res.status(500).json({ message: 'Internal Server Error' });
    }
});

Make sure to remove the second and third instances of app.delete('/blogs/:id', ...) to avoid conflicts. After making these changes, try again to see if the DELETE method works as expected.

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Reactjs – why DELETE METHOD is not working in MERN STACK blog application?

Answers