Add a filter argument to an empty query string to apply a filter. A single filter is specified as a KEY=VALUE.

An example of a filter query is shown below.

?query=\&filter=online%3D1

?query= is an empty query that needs to be added before the filter.
\&filter= is where the filter begins.
online is the key that we filter for.
%3D is an encoded equals sign =.
1 is a binary value that we filter for, "true". This indicates that we want to see the devices that are online. If a 0 was specified we would filter for offline devices.

http GET https://apps.dataplicity.com/devices/?query=\&filter=online%3D1 'Authorization: Token 123456789abcdefghijklmnopqrstuvwxyzqwer'

curl --header "Content-Type: application/json" -H "Authorization: Token 123456789abcdefghijklmnopqrstuvwxyzqwer" --request GET https://apps.dataplicity.com/devices/?query=\&filter=online%3D1

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Equals sign '=' encoding
Note that the filter argument must be percent encoded %3D to pass the equals symbol (and potentially characters in VALUE).

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Query and a Filter combination
By default to use a Filter we have to combine it with a query. Combining multiple search options is explained here.