npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

safe-expression

v1.0.2

Published

🛡️ A lightweight, CSP-safe and fast javascript expression parser/executor

Downloads

4,936

Readme

js-safe-expression

Test and Build Build and Release NPM Downloads

A lightweight, CSP-safe and fast javascript expression parser/executor. The main usage for this project is to execute javascript code without using eval or Function. It is built on the top of the AngularJS 1 internal lexer/parser. It compiles & executes javascript strings using a provided scope such as "1+1" or "context.call_a_function()", "value = 'foo", "value === 'foo'"

This project can run on websites having a strict CSP policy and can be easily plugged on the top on frameworks such as Petite-Vue, AlpineJS, Preact.

The code is 19KB when minified and 5KB once gzipped

How to use?

Import the module in your code:

var SafeExpression = require("safe-expression");


var SafeExpression = require("safe-expression");

var execute = new SafeExpression();

// Returns 2
console.log(execute("1+1")());

// Returns 4
console.log(execute("1 + value")({
  value: 3
}));

// Returns true
console.log(execute("value === true")({
  value: 3
}));

// Executes a function
var store = {
  internal_code: () => {
    console.log("Executed") 
  }
};
execute("internal_code()")(store);

Caveats

  • It is not currently supporting ++ and -- operators, so use test = test + 1 instead of test++
  • Operands are not possible in function calls. For instance, context.call_a_function(index + 1) will execute context.call_a_function(index)

Notes about the autorship

This code is made from an extract of AngularJS's parser.

The main different with the original code is we changed all AngularJS internals so it can run as a standalone library, without embedding the rest of AngularJS.

Some AngularJS specific features got removed such as filters and watchers so it can work with a VanillaJS syntac