This example demonstrates how to fetch and display cryptocurrency data from a JSON source using Node.js and JavaScript.

This JavaScript script fetches cryptocurrency data from a given URL and logs details such as the symbol, last price, high price, low price, change rate, and the last updated time for each cryptocurrency. The script uses Node.js's built-in https module to perform a GET request and fetch the raw JSON data.

1. Fetching Data:

   • The fetchJsonData function sends an HTTPS GET request to fetch the data from the provided URL. It returns a promise that resolves with the parsed JSON data or rejects with an error in case of failure.
   • Data is fetched using the https.get method. The incoming data is concatenated in chunks until the entire response is received, after which the data is parsed into a JavaScript object using JSON.parse.

2. Displaying Coin Information:

   • The displayCoinInfo function accepts an object representing the coin data and logs the relevant information, including the symbol, last price, high/low prices, change rate, and last updated time.

3. Error Handling:

   • The script uses a try-catch block to handle errors. If an error occurs during the fetching or parsing of data, an error message will be displayed.

consthttps=require('https');// URL of the raw JSON fileconstrawJsonUrl='https://raw.githubusercontent.com/Crypto-Static/Rate/main/rateStatic.json';/** * Fetch JSON data from a given URL using a GET request. * * @param{string} url - The URL to fetch data from. * @returns{Promise<Object>} A promise that resolves with the JSON data or rejects with an error. */functionfetchJsonData(url){returnnewPromise((resolve,reject)=>{https.get(url,(res)=>{letdata='';// Concatenate data as it comes in chunksres.on('data',(chunk)=>{data+=chunk;});// When the response is complete, parse the JSONres.on('end',()=>{try{constjsonData=JSON.parse(data);resolve(jsonData);}catch(err){reject(newError('Error parsing JSON: '+err.message));}});}).on('error',(err)=>{reject(newError('Failed to fetch data: '+err.message));});});}/** * Display information about a cryptocurrency coin. * * @param{Object} coin - An object containing coin data. */functiondisplayCoinInfo(coin){const{ symbol, lastPrice, highPrice24h, lowPrice24h, changeRate, lastUpdated }=coin;console.log(`Symbol: ${symbol} | LAST: ${lastPrice} | HIGH: ${highPrice24h} | LOW: ${lowPrice24h} | CHANGE: ${changeRate} | UPDATED: ${lastUpdated}`);}// Main execution block(async()=>{try{// Fetch JSON data from the specified URLconstcoinDataList=awaitfetchJsonData(rawJsonUrl);// Loop through each coin's data and display the relevant informationcoinDataList.forEach(displayCoinInfo);}catch(err){console.error('Error:',err.message);}})();

1. Run the Script:

   • Save the JavaScript file and run it using Node.js. For example:

   node fetch_crypto_data.js

2. Modify the URL:

   • If needed, you can change the rawJsonUrl variable to point to a different JSON API endpoint.

Symbol: BTC | LAST: 47000 | HIGH: 47200 | LOW: 46500 | CHANGE: 1.5% | UPDATED: 2024-10-15 12:34:56 Symbol: ETH | LAST: 3200 | HIGH: 3250 | LOW: 3150 | CHANGE: 2.0% | UPDATED: 2024-10-15 12:35:12 & ... 

• This script can be integrated into a larger application or web service.
• You may add filtering functionality or specific data display formats based on the requirements.