Great question. A few reasons:
1. JSON Mask* doesn't alter the structure of the document*. It doesn't
select elements (like JSONPath or JSONSelect), but rather filters the parts
of the object that you don't need. To illustrate that point, instead of
getting "[{a: 1}, {z: 1}]" from the example above, with JSON Mask you get
"{p: {a: 1}, z: 1}". This is important to me because I made this
specifically to work with HTTP resources, the structure of which I didn't
want to change.
2. It's* faster* for the types of selectors it supports (the syntax is
simple, so there are only a handful). Take a look at
http://jsperf.com/jsonpath-vs-jsonmask (61% faster on selecting items from
an array in Chrome). It can be even faster if you pre-compile the query
with `jsonMask.compile()` and then use `jsonMask.parse()`. But that, of
course, only works when you know the query ahead of time.
3. It has a scary mascot :)
- Yuriy
On Tuesday, July 16, 2013 6:13:52 AM UTC-4, Floby wrote:
>
> Looks nice. But why not choose something like JSONPath for selecting
> fields ?
>
> On Monday, 15 July 2013 08:59:11 UTC+2, Yuriy Nemtsov wrote:
>>
>> If you send the *"?fields="* query-string to a Google API, you'll get
>> just the parts of the JSON object from the response that you requested.
>>
>> Now, you can have this same exact feature in your Node.js services. Say
>> hello to *JSON Mask <https://github.com/nemtsov/json-mask>* and the *Partial
>> Response Middleware<https://github.com/nemtsov/partial-response-middleware>
>> * for express!
>>
>> *JSON Mask* is a tiny language and an engine for selecting specific
>> parts of a JS object, hiding/masking the rest. Here's a tiny sample of what
>> it looks like:
>>
>> var mask = require('json-mask')mask({p: {a: 1, b: 2}, z: 1}, 'p/a,z') //
>> {p: {a: 1}, z: 1}
>>
>> *Partial Response Middleware* is an express middleware that will
>> integrate with your existing services with no additional code if you're
>> using* res.json() or res.jsonp()* So, instead of getting the entire JSON
>> object, your services will start being able to respond with partial objects.
>>
>>
>> I'd love to hear what you think about these.
>>
>> - Yuriy
>>
>
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