Setting up an Apollo Server to use GraphQL queries and mutations to fetch and modify data, replacing the existing RESTful API.

Modifying the existing authentication middleware so that it works in the context of a GraphQL API.

Creating an Apollo Provider so that requests can communicate with an Apollo Server.

Deploying your application to Heroku with a MongoDB database using MongoDB Atlas.

"start": "node server/server.js",
"develop": "concurrently \"cd server && npm run watch\" \"cd client && npm start\"",
"install": "cd server && npm i && cd ../client && npm i",
"build": "cd client && npm run build"

Mutation (for logging in)
mutation Login($email: String!, $password:String!) {
  login(email: $email, password:$password){
user {
email
password
}
}
}

query variable

```md
{
"email": "[email protected]",
"password": "password02"
}
```

{
"data": {
"login": {
"user": {
"email": "[email protected]",
"password": "$2b$10$BN48OB/mtfpSJJ8bVkq7BOB.mMybOAj6hyMd.L/p8I8uRfiu1gLda"
}
}
}
}

mutation AddUser($username: String!, $email: String!, $password: String!) {
  addUser(username:$username,email: $email, password:$password){
user {
username
email
password
}
}
}

query variables
{
"username":"abcd",
"email": "[email protected]",
"password": "12345678"
}

Result
{
"data": {
"addUser": {
"user": {
"username": "abcd",
"email": "[email protected]",
"password": "$2b$10$YhKCqDq66xOudOzjGlUuZu/2yiLv8kcxqfVMOosBYN/PE8adAYmoW"
}
}
}
}