In JavaScript, you can use the `eval()`

function to evaluate a string as a mathematical expression:

```
const expression = "2 + 3";
const result = eval(expression);
console.log(result);
```

Note that using `eval()`

can be dangerous as it evaluates any JavaScript code in the string, potentially allowing arbitrary code execution. It’s recommended to use safer alternatives, such as using a library specifically designed for evaluating mathematical expressions, such as `mathjs`

.

Here’s an example using `mathjs`

:

```
const math = require("mathjs");
const expression = "2 + 3";
const result = math.evaluate(expression);
console.log(result);
```

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