CODEWITHSUNDEEP
arraysnode.jsvalidationexpress
M. Ali
M. Ali

Reputation: 2396

How to validate arrays in forms in express-form

While defining my route, I would like to be able to validate if an incoming parameter is an array and raise an error if it isn't. I have so far been using express-form for all validations and can't seem to find a way to validate arrays in it. I know I can use express-validate for a doing this but I would like to keep using what I've been using so far so that everything can look uniform.

app.post(
    '/addUserInfo',
    form(
        field('userID').trim().required().is(idRegex)
        // Need similar check for 'items' field here
    ),
    offline.addUserInfo
);

Upvotes: 0

Views: 149

Answers (1)

Molda
Molda

Reputation: 5704

It's in the docs!

You can use:

Update As mentioned in comment the value is string so needs to be parsed to array

field('items').custom(function(value){ 

    // check if value is array, throw error if not 

    //if(value instanceof Array) return;

    if(JSON.parse(value) instanceof Array) return;

    throw new Error('The field "items" is not an array');

});

Upvotes: 1

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