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expression-eval
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JavaScript expression parsing and evaluation.
Powered by jsep.
Install:
npm install --save expression-eval
Import:
// ES6
import { parse, eval } from 'expression-eval';
// CommonJS
const { parse, eval } = require('expression-eval');
// UMD / standalone script
const { parse, eval } = window.expressionEval;
import { parse } from 'expression-eval';
const ast = parse('1 + foo');
The result of the parse is an AST (abstract syntax tree), like:
{
"type": "BinaryExpression",
"operator": "+",
"left": {
"type": "Literal",
"value": 1,
"raw": "1"
},
"right": {
"type": "Identifier",
"name": "foo"
}
}
import { parse, eval } from 'expression-eval';
const ast = parse('a + b / c'); // abstract syntax tree (AST)
const value = eval(ast, {a: 2, b: 2, c: 5}); // 2.4
Alternatively, use evalAsync
for asynchronous evaluation.
import { compile } from 'expression-eval';
const fn = compile('foo.bar + 10');
fn({foo: {bar: 'baz'}}); // 'baz10'
Alternatively, use compileAsync
for asynchronous compilation.
Although this package does avoid the use of eval()
, it cannot guarantee that user-provided expressions, or user-provided inputs to evaluation, will not modify the state or behavior of your application. Always use caution when combining user input and dynamic evaluation, and avoid it where possible.
For example:
const ast = expr.parse('foo[bar](baz)()');
expr.eval(ast, {
foo: String,
bar: 'constructor',
baz: 'console.log("im in ur logs");'
});
// Prints: "im in ur logs"
The kinds of expressions that can expose vulnerabilities can be more subtle than this, and are sometimes possible even in cases where users only provide primitive values as inputs to pre-defined expressions.
MIT License.
FAQs
JavaScript expression parsing and evaluation.
The npm package expression-eval receives a total of 189,893 weekly downloads. As such, expression-eval popularity was classified as popular.
We found that expression-eval demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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