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• How can I fixed my problem"FirebaseError: Firebase: Error (auth/invalid-api-key)."

  My environment variable is ok. No comas and name mistakes but they given me error like "FirebaseError: Firebase: Error (auth/invalid-api-key)". How can I fixed it. Please Help me...

  This my .env file

  REACT_APP_apiKey=AIzaSyBWobnhbdeMdNpXXXXXXXXXXXXXXXXXXXX
  REACT_APP_authDomain=XXXXX.firebaseapp.com
  REACT_APP_projectId=XXXX
  REACT_APP_storageBucket=XXXXX.appspot.com
  REACT_APP_messagingSenderId=4997390XXXXX
  REACT_APP_appId=1:4997390XXXXX:web:cc7bc80aa1bdb78fXXXXXX
  REACT_APP_measurementId=G-M1XDXXXXXX
  

  This my firebase config file

  const firebaseConfig = {
    apiKey: process.env.REACT_APP_apiKey,
    authDomain: process.env.REACT_APP_authDomain,
    projectId: process.env.REACT_APP_projectId,
    storageBucket: process.env.REACT_APP_storageBucket,
    messagingSenderId: process.env.REACT_APP_messagingSenderId,
    appId: process.env.REACT_APP_appId,
    measurementId: process.env.REACT_APP_measurementId,
  };
  
  when I debugging firebaseConfig object
  
  console.log(firebaseConfig.apiKey);  ==========> undefined 
  console.log(firebaseConfig.authDomain);  ==========> undefined 
  console.log(firebaseConfig.projectId);  ==========> undefined 
  console.log(firebaseConfig.storageBucket); ==========> undefined 
  console.log(firebaseConfig.measurementId); ==========> undefined 
  console.log(firebaseConfig.appId); ==========> undefined 
  console.log(firebaseConfig.measurementId); ==========> undefined 
  
  

  client side given error this "FirebaseError: Firebase: Error (auth/invalid-api-key)"
• How to order comments in firebase firestore by createdAt

  I have a document in which there is a comments array of objects and each object has createdAt property. I want to sort all the comments that are inside the comments array using the createdAt property, so, a new comment comes to the top.

  I did some research and found that we can do this in firebase's real-time database but I want to do the ordering of data using firestore.

  Here is my code:

  import { useEffect, useRef, useState } from "react"
  // firebase import
  import { doc, onSnapshot, orderBy, query } from "firebase/firestore"
  
  import { db } from "../firebase/config"
  
  export const useDocument = (c, id, o) => {
    const [document, setDocument] = useState(null)
    const [error, setError] = useState(null)
  
    // realtime document data
    useEffect(() => {
      let docRef = doc(db, c, id)
  
      if (o) {
        docRef = query(docRef, orderBy("createdAt", "desc")) // this is not working
      }
  
      const unsubscribe = onSnapshot(
        docRef,
        (snapshot) => {
          // need to make sure the doc exists & has data
          if (snapshot.data()) {
            setDocument({ ...snapshot.data(), id: snapshot.id })
            setError(null)
          } else {
            setError("No such document exists")
          }
        },
        (err) => {
          console.log(err.message)
          setError("failed to get document")
        }
      )
  
      // unsubscribe on unmount
      return () => unsubscribe()
    }, [c, id])
  
    return { document, error }
  }
  
  

  createdAt property:
• How to group firebase data in flutter with DateTime?

  I am making a chat application in flutter using firebase. I want to show a header with the date whenever the date changes. How can I group messages in flutter coming from firebase on the basis of date and show a header with the changed date?

  I have tried GroupedListView package but I was not able to retrieve the chatmessages successfully.