I am pleased to announce an initial release ExJSONPath.

ExJsonPath is an Elixir library which allows to query maps (JSON objects) and lists (JSON arrays), using JSONPath expressions.

We decided to implement ExJSONPath while working on Astarte Flow, since we wanted to allow users to query arbitrary JSON objects from their pipelines code.

ExJsonPath allows to query deserialized JSON files [1] using expressions similar to the following:

ExJsonPath.eval(store, "$.store.book[?(@.price > 20)].title")
{:ok, ["The Lord of the Rings"]}

ExJsonPath is not tied to JSON at all, the same kind of JSONPath expression can be used on any Elixir map or list.
Right now, the only hard requirement is that keys must be strings.

Hope you’ll find this useful
Let me know if you have any request/question/feedback.

[1]:

{ "store": {
    "book": [ 
      { "category": "reference",
        "author": "Nigel Rees",
        "title": "Sayings of the Century",
        "price": 8.95
      },
      { "category": "fiction",
        "author": "J. R. R. Tolkien",
        "title": "The Lord of the Rings",
        "isbn": "0-395-19395-8",
        "price": 22.99
      }
    ],
    "bicycle": {
      "color": "red",
      "price": 19.95
    }
  }
}