There is a provision for try-catch block in javascript. While in java or any other language it is mandatory to have error handling, I don't see anybody using them in javascript for greater extent. Isn't it a good practice or just we don't need them in javascript?
One should avoid throw errors as the way to pass error conditions around in applications.

The throw statement should only be used "For this should never happen, crash and burn. Do not recover elegantly in any way"

try catch however is used in situation where host objects or ECMAScript may throw errors.

Example:

var json
try {
    json = JSON.parse(input)
} catch (e) {
    // invalid json input, set to null
    json = null
}


Recommendations in the node.js community is that you pass errors around in callbacks (Because errors only occur for asynchronous operations) as the first argument

fs.readFile(uri, function (err, fileData) {
    if (err) {
        // handle
        // A. give the error to someone else
        return callback(err)
        // B. recover logic
        return recoverElegantly(err)
        // C. Crash and burn
        throw err
    }
    // success case, handle nicely
})


There are also other issues like try / catch is really expensive and it's ugly and it simply doesn't work with asynchronous operations.

So since synchronous operations should not throw an error and it doesn't work with asynchronous operations, no-one uses try catch except for errors thrown by host objects or ECMAScript
