In all of JavaScript, I’m not sure there is a more maligned piece than eval(). This simple function designed to execute a string as JavaScript code has been the more source of more scrutiny and misunderstanding during the course of my career than nearly anything else. The phrase “eval(...
a: function () { return 'APPLE' } } var evaluated = safeEval(code, context) // { pid: 16987, apple: 'APPLE' }// pass an options object to the vm var code = 'process' safeEval(code, {}, { filename: 'myfile.js'}) // myfile.js can be seen in the stacktraceLicense...
When attackers can't inject script directly, they use the JavaScript function eval() and similar methods to trick the target applications into converting text into an executable JavaScript to achieve code injection. So, in addition to inline scripts, Mozilla has also removed and blocked eval-like ...
// your own context API - access to Node's process object and a custom functionvarcode='{pid: process.pid, apple: a()}'varcontext={process:process,a:function(){return'APPLE'}}varevaluated=safeEval(code,context)// { pid: 16987, apple: 'APPLE' } ...