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express-jsonq

v0.0.5

Published

Express Middleware that parses the query string as JSON and exposes it to your router

Downloads

18

Readme

MIT Licensed.

npm install express-jsonq

What is express-jsonq?

express-jsonq is a light-weight Expressjs Middleware plugin that parses the query string as JSON and exposes it to your router.

Suppose you want have a WebAPI handles the query param string as JSON, how to achieve this?

Let's look at what a route might look like:

/api/users/?{id: 001}

Without express-jsonq, you have to do some additional logic to get that id. You might try this:


var router = require('express').Router(),
    url = require('url');

router.get('/users', function (req, res) {
   var query, queryJSON;
   // since ANYTHING could be sent, let's catch an exception if it occurs.
    try {
        query = url.parse(req.url).query;
        // only bother if there is a query string at all
        if (query) {            
           queryJSON = JSON.parse(decodeURIComponent(query));
           res.send('your id is', queryJSON.id);
        }
        // We've failed to parse the query string!
        // Instead of kicking an exception, just call next, so the next middleware can handle it.
        // the next middleware could try to look for a different query, or something..
    } catch (e) {
        next();
    }
});

But what if you want to that in a lot of different places? Instead of duplicating code you can use a middleware.

Installation

npm install express-jsonq

Basic Usage

var express = require('express'),
    jsonq  = require('jsonq'), 
    app = express();
 
app.use(jsonq());

app.get('/', function (req, res) {
    // Your json query params:
    console.log(req.jsonq);
});
 
app.listen(3000);

Explicit Usage


router.get('/users', jsonq(), function (req, res, next) {
   // do stuff
});