1. How to parse JSON using Nodejs
To parse JSON using Nodejs you can simply use JSON.parse().
The JSON.parse() method parses a string as JSON. Syntax of JSON.parse() is JSON.parse(text) where text : The string to parse as JSON. It returns the Object corresponding to the given JSON text.
2. How to print a stack trace in Nodejs
To print a stack trace in Nodejs you can simply use stack member of Error object.
For Example,
var stackTrace = new Error().stack;
console.log(stackTrace);
3. How to write in file in Nodejs
To write in file you have to use filestream.
For example,
var fs = require('fs')
fs.writeFile("File_Location", "Text_To_Write", fucntion(err)){
if(err) {
console.log(err);
} else {
console.log("Success");
}
});
4. How to load HTML in Nodejs
To load HTML in Nodejs we can use filestream library.
For example,
var fs = require('fs');
fs.readFile(filename, "binary", function(err, file) {
if(err) {
return;
}
response.writeHead(200, {"Content-Type": "text/html"});
response.write(file);
response.end();
});
5. How to do Encryption in Nodejs
For doing Encryption in Nodejs we can use crypto module.
For example,
var crypto = require('crypto');
var value = crypto.createHmac('SHA256', 'key').update('string').digest('base64');
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