REST url for resource collection, which filters resource by attribute not equal to a given value

Question

How to design REST url for resource collection, which filters resource by attribute not equal to a given value?

For example, to get the students in 8th grade, we use

Answer 1

Stripe has one of the most respected APIs.

They use a separate parameter for each operator separated with a dot.

For example, to search on created date:

/charges?created.gt=
/charges?created.gte=
/charges?created.lt=
/charges?created.lte=

In your case you could do something like:

/students?grade.gt=8&grade.lt=8

Or even add another operator for not:

/students?grade.not=8