CODEWITHSUNDEEP
node.jsexpress
Amitava
Amitava

Reputation: 5083

nodejs (express) is it possible to have case insensitive querystring?

It seems that querystring is case sensitive. Is it possible to have a case insensitive querystring?

If my url has ?Id=10, accessing req.query.id returns undefined.

Upvotes: 15

Views: 15583

Answers (3)

Ezra Epstein
Ezra Epstein

Reputation: 31

If both the parameter and its values are to be treated case-insensitively then there's a simple approach:

const express = require('express');
const qs = require('qs');
const app = express();

app.set('query parser', function(str) {
    // See https://github.com/ljharb/qs/blob/410bdd3c8ae7f5d7ae9b52648b8642b8adc5e1c0/dist/qs.js#L47 
    return qs.parse(typeof str === 'string' ? str.toUpperCase() : str, {});
});

That is, simply upper-case (or lower if you prefer) the entire query string before it is parsed.

Upvotes: 0

Jørn Schou-Rode
Jørn Schou-Rode

Reputation: 38346

With the solution proposed by Robert, be aware that whenever you read from req.query, you will need to use lowercased keys. This makes future additions to your API error prone.

Here is an alternative piece of middleware, using a Proxy object to modify the behavior of req.query[...], so that lookups are case insensitive:

app.use((req, res, next) => {
  req.query = new Proxy(req.query, {
    get: (target, name) => target[Object.keys(target)
      .find(key => key.toLowerCase() === name.toLowerCase())]
  })

  next();
});

Besides being less error prone, this approach also leaves the req.query intact for enumerating operations, where the original solution would potentially create duplicate key/value pairs.

Upvotes: 15

robertklep
robertklep

Reputation: 203419

It's not possible as-is, but you could insert a very simple middleware which would, for instance, lowercase all keys in req.query: 

// insert this before your routes
app.use(function(req, res, next) {
  for (var key in req.query)
  { 
    req.query[key.toLowerCase()] = req.query[key];
  }
  next();
});

Upvotes: 29

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