blocked error

hello everyone

I’m receiving the following errors. im currently on the dex javascript project

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at (Reason: CORS header ‘Access-Control-Allow-Origin’ missing). Status code: 404.

Uncaught (in promise) TypeError: NetworkError when attempting to fetch resource.

im able too log into metamask but im not sure why im getting this error. this is my current code

<!DOCTYPE html>
<html lang="en">
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">

        <!-- Moralis SDK code -->
        <script src=""></script>
        <script src=""></script>

        <title>Moralis Dex </title>


    <button id="btn-login">Moralis Login</button>
    <button id="btn-logout">Logout</button>

    <script src="./dex.js"></script>


    // connect to Moralis server

      const serverUrl = "**************************";
      const appId = "*******************";
      Moralis.start({ serverUrl, appId });

     // add from here down
     async function login() {
      let user = Moralis.User.current();
      if (!user) {
        user = await Moralis.authenticate();
      console.log("logged in user:", user);

    async function getStats()
      const balances = await Moralis.Web3API.account.getTokenBalances();
      console.log (balances);


    async function logOut() {
      await Moralis.User.logOut();
      console.log("logged out");

    document.getElementById("btn-login").onclick = login;
    document.getElementById("btn-logout").onclick = logOut;

async function getTop10tokens() {
    const response = await  fetch (' ');
    const tokens  =  await response.json();

    return tokens.filter( token => token.rank <= 10).map(token => token.symbol);


async function gettickerdata() {
    const response  = await fetch ('');
    const tokens =  await response.json ();
    const tokenlist = object.values(tokens.tokens);

    return tokenlist. filter(token => tickerlist.includes(token.symbol));



does anyone know why this is happening?

It looks like is not working.

that makes sense. should the code typically work when the api is up?

what source should i use if coin paprika is down too test my code?

Yeah if the website is working you should be able to fetch the data with your code.

I am not sure what type if data you are looking for. You can give a try with coingecko api.

That Paprika API seems fine but you haven’t passed anything into it.

E.g. if you change the fetch to, you get some data back from tokens.

Have a look at the docs to find out what to use for the data you want.

1 Like

thank you that made my error go away :slight_smile: