ExSift: High-performance MongoDB-style query filtering for Elixir
I’m working on ExSift, a high-performance library that uses sift.js-inspired MongoDB-style query syntax to filter Elixir collections.
What is it?
ExSift uses a MongoDB’s declarative syntax to filter lists of maps or structs. When creating dynamic search APIs, rule engines, or intricate data filtering logic (such as memory-only data or API answers) when Ecto queries aren’t suitable, it’s ideal.
Key Features
-
MongoDB Syntax: Supports standard operators like
$eq,$gt,$in,$regex,$elemMatch,$and,$or, and many more. -
Nested Support: Deeply query nested maps and lists using dot notation (e.g.,
%{ "user.address.city" => "New York" }). -
High Performance: Recently optimized with a new compilation engine that pre-compiles queries into native Elixir function calls, resulting in a ~2.3x speedup over runtime interpretation.
-
Safe: Runs in pure Elixir, no external dependencies for the core logic.
Example
data = [
%{name: "Alice", age: 30, role: "admin"},
%{name: "Bob", age: 25, role: "user"},
%{name: "Charlie", age: 35, role: "user"}
]
query = %{
"role" => "user",
"age" => %{"$gt" => 20}
}
ExSift.filter(data, query)
# => [%{name: "Bob", ...}, %{name: "Charlie", ...}]
Links
- Hex: https://hex.pm/packages/ex_sift
- GitHub:
I’d love to hear your feedback and see how you use it! I’m open to contributions 
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