Express Validator

Question

I'm using express-validator for making a Nodejs MongoDB application. I've installed the latest version of express-validator and Node but coming across "TypeError: expressValidator is not a function" as an error.

app.use(expressValidator({ errorFormatter: function(param, msg, value){ var namespace = param.split('.'), root = namespace.shift(), formParam = root; while(namespace.length){ formParam += '[' + namespace.shift() + ']'; } return { param: formParam, msg: msg, value: value }; } }));

Seems like it's an issue in the way "express-validator" is called. Try to look at its documentation to see how they intend it to be used. — Adriano
– Adriano, Commented Dec 23, 2020 at 10:33
it's working with version @5.3.0 but not with the latest version @6.8.1. — Shahab Hashmi
– Shahab Hashmi, Commented Dec 23, 2020 at 11:01
How did you require express-validator package? And, what's expressValidator? — Lin Du
– Lin Du, Commented Dec 29, 2020 at 10:12

Abhishek · Accepted Answer · 2021-04-07 05:28:17Z

I guess you should not require express-validator as expressValidator.
According to express-validator V 6.10.0 docs you should do some thing like this

const { body, validationResult } = require("express-validator"); app.get('/signup',body('email').isEmail(), body('password').isLength({min: 5}), (req, res) => { const errors = validationResult(req); if (!errors.isEmpty()) { // handle error } // save user in DB });

we can also use custom validation for our fields checkout docs for more information.

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