How can i parse express query param to mongodb regex query? - regex

Question

I try to build a test backend with express.
And got a problem that i cannot seem to overcome.
Trying to give the query object $regex param a value from the req.query.name. But it only returns an empty array. When i console.log(laptopName) it outputs the right value that is being given as a query param.
If i just replace $regex: laptopName with a concrete value $regex: 'vivobook' i do get results.
With $regex: laptopName console.log looks like this { name: { '$regex': '"vivobook"', '$options': 'i' } }
With $regex: 'vivobook' console.log looks like this: { name: { '$regex': 'vivobook', '$options': 'i' } }
app.get("/api/v1/laptops", (req, res) => {
MongoClient.connect(mongo_url, { useNewUrlParser: true }, (err, client) => {
const db = client.db("laptop_backend");
const collection = db.collection("laptops");
let laptopName = req.query.name;
let query = {
name: {
$regex: laptopName,
$options: 'i'
}
};
collection
.find(query)
.toArray()
.then(response => res.status(200).json(response))
.catch(err => console.error(err));
});
});

Answer 1

Try getting laptop name directly from params such as
let { name } = req.query;
let query = {
name: {
$regex: name,
$options: 'i',
}
};
if you are to modify completely i suggest changing code without promise.
app.get("/api/v1/laptops", async (req, res) => {
try {
const client = await MongoClient.connect(mongo_url, { useNewUrlParser: true });
const db = client.db('laptop_backend');
const collection = db.collection('laptops');
const { name } = req.query;
const query = {
name: {
$regex: name,
$options: 'i',
},
};
const result = await collection.find(query);
res.status(200).json({ result });
} catch (e) {
console.log(e);
res.status(400).json({ error: true });
}
});