meval - m(imic) eval

Info

This is not a “safe JavaScript eval”!
This library only mimics eval() functionality to some point.
It always returns the value of given expression. You always need to provide context in which it will be executed (context must be an Object).
Pure JavaScript! No dependencies! ^^,
Minified version is only ~16KB

one-argument operators:
- ! ...
- ~ ...
- + ...
- - ...
- typeof ...
two-argument operators:
- ... . ... (member accessor)
- ... * ...
- ... / ...
- ... % ...
- ... + ...
- ... - ...
- ... >= ...
- ... <= ...
- ... > ...
- ... < ...
- ... instanceof ...
- ... in ...
- ... === ...
- ... !== ...
- ... == ...
- ... != ...
- ... && ...
- ... || ...
three-argument operator:
- ... ? ... : ...
Strings, Numbers (both Integers and Floats) and Booleans
- Node: Interpolation in Strings is not planned for now to be implemented
properties:
- undefined
- null
- NaN
- Infinity
grouping (paranthesis)
calling methods
- support nested methods (e.g. foo(1, bar(item.a, item.b)))
accessing allowed global Object:
- Date
- Math
- Number
- String
- Array
- Object
mixing above

It’s UMD package, so you can use it both: client-side (browser) and server-side (node.js).
Probably you want to just intall it with npm:

npm install --save meval

And then just require it:

const meval = require('meval');

But if you don’t want to use npm, you can always simply download eg. minified version right from Releases.

/**
 * @param {String} expression Expression to be parsed
 * @param {Object} context Context for expression
 */
meval(expression, context)

<< meval('item.a + item.b * 5', { item: { a: 2, b: 3 } })
>> 17

See also the list of contributors
who participated in this project.

This project is licensed under the ISC License - see the LICENSE file for details.