Params are parsed as string by express middleware. Say I make a req to path defined below like /some/1000

app.get('/some/:path', (req, res, next) => {
  console.log(typeof req.param.path)
  // outputs string
})

So you need to parse the incoming parameter to integer (Number) since you've stored accountNumber as integer. So adding toInt to chain like below should solve it:

const validateReq: [
  param('accountNumber').exists().toInt().custom(acctNo => accountNumberExist(acctNo)),
]

Validating req.params with express validator, Params are parsed as string by express middleware. Say I make a req to path defined below like /some/1000 app.get('/some/:path', (req, res,� Validating req.params with express validator. Ask Question Asked 1 year, 2 months ago. Active 9 months ago. Viewed 4k times 1. 1. I want the user to be able to write

accountNumber inside accounts array is a number whereas req.params.accountNumber is a string. You need to convert the data type. You can do it as

    accountNumberExist(inputAcct) {
        const isfound = accounts.find(account => account.accountNumber.toString() === inputAcct);
        if (isfound === undefined) throw new Error('Account Number not found');
  }

Validating input in Express using express-validator, Learn how to validate any data coming in as input in your Express Say you have a POST endpoint that accepts the name, email and age parameters: const app = express() app.use(express.json()) app.post('/form', (req,� Same as check([fields, message]), but only checking req.params. query([fields, message]) Same as check([fields, message]), but only checking req.query. checkSchema(schema) schema: the schema to validate. Must comply with the format described in Schema Validation. Returns: an array of validation chains. oneOf(validationChains[, message])

I think that the problem is your query. find method runs in an asynchronous way, that's why isfound property does not contain the data you expect. Here is a simple approach using promises which works pretty well for me.

// Here is your function.
accountNumberExist(inputAcct) {
    return accounts.find({accountNumber: inputAcct})
    .then(result => {
        if (result.length == 0) {
            console.log("Account Number not found");
            return Promise.reject('Account Number not found');
        }
        return Promise.resolve();
    });

}

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Comments

• As the express-validator maintainer: this would be the preferred way of solving this ;)
• The OP is using plain arrays. No async stuff involved.
• @gustavohenke where is the problem in this code? It is also recommended from the official docs express-validator.github.io/docs/…
• As said above, the OP is using plain arrays, the .find() mentioned above is Array.prototype.find -- not some kind of DB query or API call.