Validating req.params with express validator

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I want the user to be able to write a specific account number in the endpoint, been trying to validate the endpoint param if it exists in my database. I couldn't get it to work, please what am I doing wrong?

My validation

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

My accountNumberExist function

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

My accounts file

    const accounts = [
  {
    id: 1,
    accountNumber: 1234567890,
    createdOn: new Date(),
    owner: 1,
    type: 'current',
    balance: 23444.43,
    status: 'active',
  },
  {
    id: 2,
    accountNumber: 1234167890,
    createdOn: new Date(),
    owner: 1,
    type: 'savings',
    balance: 2233444.43,
    status: 'active',
  },
  {
    id: 3,
    accountNumber: 9987654321,
    createdOn: new Date(),
    owner: 2,
    type: 'saving',
    balance: 73444.43,
    status: 'active',
  },
];

But this is always throwing the 'Account Number not found' error even though, the req.param exists in my accounts database.

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();
    });

}

How to validated req.params new api � Issue #442 � express , Sorry, I did not hit how to validate export const rules = [ check('id').exists().custom ((value, { req }) => { const { id } = req.body.params return� This changed when the API for validator.js switched to accepting only string inputs. In order to not introduce breaking changes to express-validator, those same guidelines from validator.js were introduced to express-validator so express-validator would comply with the new API for validator.js.

How to make input validation simple and clean in your Express.js app, js framework, validation plays a crucial role in any web app which requires you to validate the request body param query . Writing your own� express-validator. An express.js middleware for validator. Installation; Documentation; Changelog; License; Installation npm install express-validator Also make sure that you have Node.js 8 or newer in order to use it. Documentation. Please refer to the documentation website on https://express-validator.github.io. Changelog. Check the GitHub

Validate your request parameters using validation middleware in , a request parameter validation middleware in Node.js and reduce the amount of code that you repeat. Tagged with javascript, node, express,� In this tutorial, you’ll learn how to validate input in an Express.js app using an open source and popular module called express-validator. Introduction to express-validator. The definition on Github says: express-validator is a set of express.js middlewares that wraps validator.js validator and sanitizer functions.

How to validate your request parameters easily using middleware in , You can choose whichever you want to use. Edit 1: Using Express-Validation for � In this tutorial you’ll learn how to validate input in express.js app using an open source and popular module express-validator. Introduction to express-validator. Definition on github says: express-validator is a set of express.js middlewares that wraps validator.js validator and sanitizer functions. Module implements 5 important API’s

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.