Informix 12.10.xC4 has some very exciting new features for JSON compatibility:
Support for CORS requests in the REST API (12.10.xC4W1)
You can now set up cross-origin resource sharing (CORS) with the REST API. To do so, set the following optional parameters that were added to the jsonListener.properties file:
Informix now supports the following MongoDB 2.4 features:
Cursor support so that you can query large volumes of data.
Text search of string content in collections and tables.
Geospatial indexes and queries.
Pipeline aggregation operators.
The array update modifiers: $each, $slice, $sort.
You can perform the following new tasks that extend MongoDB functionality in your JSON application:
Import and export data directly with the wire listener by using the Informix JSON commands exportCollection and importCollection.
Configure a strategy for calculating the size of your database by using the Informix extension to the MongoDB listDatabases command: sizeStrategy option or command.listDatabases.sizeStrategy property.
You can customize the behavior of the wire listener by setting new properties. For example, you can control logging, caching, timeout, memory pools, and the maximum size of documents.
Access Informix from REST API clients
You can now directly connect applications or devices that communicate through the REST API to Informix. You create connections by configuring the wire listener for the REST API. With the REST API, you can use MongoDB and SQL queries against JSON and BSON document collections, traditional relational tables, and time series data. The REST API uses MongoDB syntax and returns JSON documents.
Create a time series with the REST API or the MongoDB API
If you have applications that handle time series data, you can now create and manage a time series with the REST API or the MongoDB API. Previously, you created a time series by running SQL statements. For example, you can program sensor devices that do not have client drivers to load time series data directly into the database with HTTP commands from the REST API.
You create time series objects by adding definitions to time series collections. You interact with time series data through a virtual table.
See the IBM Informix JSON Compatibility Guide.