arikogan

<a href="http://v2.wp-api.org/" rel="nofollow ugc">WP REST API</a> plugin provides the ability to interact with a WordPress installation through a REST API. When retrieving posts, a use case would be to filter them based on they publish date by before/after a certain date. In WordPress this can be achieved using the <a href="https://codex.wordpress.org/Class_Reference/WP_Query#Date_Parameters" rel="nofollow ugc">date_query</a> parameter. However, the parameter is not part of the whitelisted parameters of WP REST API. A workaround is to add it ourselves as discussed <a href="https://github.com/WP-API/WP-API/issues/389" rel="nofollow ugc">here</a>. This plugin adds the date_query param to the whitelist not modifying the theme of WordPress but by using a very small and simple plugin. This allows to change and upgrade themes freely and still keep the whitelisting of the parameter.
After installing WP REST API and this plugin, you should be able to run queries like the below,
<pre><code>/wp-json/wp/v2/posts?filter[date_query][after]=2016-02-26T12:38:36
/wp-json/wp/v2/posts?filter[date_query][before]=2016-02-27T14:28:15
</code></pre>

date_query enabler

A plugin to add date_query to the list of allowed filters for the REST API so we can filter by date after/before.

svrooij

Since wordpress version 4.9.? wordpress includes the functionality provided by this plugin in the core of wordpress.
Checkout https://developer.wordpress.org/rest-api/using-the-rest-api/global-parameters/#_fields for functionality included in the wordpress core, 
they made it even better by filtering the amount of data pulled from the database.
This plugin will no longer be maintained since it has been superseded by the core functionality.
The <a href="https://wordpress.org/plugins/rest-api/" rel="ugc">wp-rest-api-v2</a> returns a lot of properties. 
It could be very useful (or mobile-data-friendly) to only return the properties needed by the application.
If you only want titles and links of some articles it doesn’t make sense to return the content or the excerpt.
This isn’t limited to posts, it also works on custom posttypes, categories, pages, terms, taxonomies and comments.
Instead of returning:
<pre><code>{
 "id": 2138,
 "date": "2015-10-25T15:31:03",
 "guid": {
 "rendered": "http://worldofict.nl/?p=2138"
 },
 "modified": "2015-10-25T15:31:03",
 "modified_gmt": "2015-10-25T14:31:03",
 "slug": "rechtenvrije-fotos",
 "type": "post",
 "link": "http://worldofict.nl/tip/2138-rechtenvrije-fotos/",
 "title": {
 "rendered": "Rechtenvrije foto’s"
 },
 "content": {
 "rendered": ".. A lot of content .. "
 },
 "excerpt": {
 "rendered": " .. A lot of content ..."
 },
 "author": 2,
 "featured_image": 2139,
 "comment_status": "open",
 "ping_status": "open",
 "sticky": false,
 "format": "standard",
 //.. even more tags ....
}
</code></pre>
It can return (with <code>fields=id,title.rendered,link</code> as GET parameter)
<pre><code>{
 "id": 2138,
 "link": "http://worldofict.nl/tip/2138-rechtenvrije-fotos/",
 "title": {
 "rendered": "Rechtenvrije foto’s"
 }
}
</code></pre>
<h4>Notes</h4>
<ol>
<li>If you specify fields so it wouldn’t return data the default response is send back to the client.</li>
<li>(for developers) something wrong with this plugin? <a href="https://github.com/svrooij/rest-api-filter-fields/" rel="nofollow ugc">Github</a></li>
<li>If you liked the plugin <a href="https://github.com/sponsors/svrooij" rel="nofollow ugc">consider sponsoring me</a></li>
</ol>

REST API – Filter Fields

This is hands-down the best REST API extension available.

Best REST API plugin

Filter the properties returned by the Wordpress rest api V2 (only needed until wordpress 4.9)

date_query enabler vs REST API – Filter Fields