How can I get this key in DATA and use this key outside of the function?

let DATA = [];

  const database = admin.database();
  let keyref = database.ref("data");

  keyref.once("value", async function (snapshot) {
    let key = await snapshot.val(); // i want this key data out side this function
    DATA.push(key);
    console.log(DATA);
  });

 console.log(DATA); // i want here that inside function key

In short, I want fetched data outside the function

CodePudding user response：

When fetching RTDB data only once, it is advised to use the get() method. This method is asynchronous, so you need to do something along the following lines:

  async function getRTDBData(ref) {
    const database = admin.database();
    const keyref = database.ref("data");
    const snapshot = await keyref.get();

    if (snapshot.exists()) {
        return snapshot.val();
    } else {
       return .... // Up to you to adapt here
    }
  }

  getRTDBData("data")
  .then(val => {
      // Do what you want with val
      cosniole.log(val);
  })