Introduction:
The purpose of this tutorial is to provide an easy and concise way to validate payload with an Express JS application.
We will be using the simple-body-validator library to achieve our goal of validating payloads
Let's say that we would like to validate the following payload.
{
"name":"John",
"email":"John@gmail.com",
"age":28
}
Installation:
To get started, install the simple-body-validator library:
npm i simple-body-validator
Validation Rules:
The simple-body-validator library offers a variety of validation rules. You can find the full list of rules in the documentation here.
const rules = {
name: 'required|string|min:3',
email: 'required|email',
age: 'min:18'
};
Code Example:
const express = require('express');
const bodyParser = require('body-parser');
const {make} = require('simple-body-validator');
const app = express();
const port = 3000;
// parse application/json
app.use(bodyParser.json());
const rules = {
name: 'required|string|min:3',
email: 'required|email',
age: 'min:18',
};
app.post('/user', (req, res) => {
const validator = make(req.body, rules);
if (!validator.validate()) {
res.status(422).json(validator.errors().all(false));
return;
}
res.send('SUCCESS');
});
app.listen(port, () => {
console.log(`Example app listening on port ${port}`)
});
With this setup, your validation is complete! We recommend that you go through the documentation for more complex use cases.
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