Exonerate - JSONschema validator for elixir

updated to version 0.2.0, which now supports (and is tested against) most of draft 4, 6, 7, 2019, and 2020, also produces better error messages for anyOf, and oneOf filters, as well as “ref traces” for if your schema validation jumps around several references.

updated to version 0.2.1, a minor upgrade which provides the required: "/jsonpointer/to/required/parameter" optional error content if a required filter in your JSONSchema fails.

updated exonerate to version 0.3.0, almost complete support for JSONSchema draft 2020-09.

A few highlights of changes:

• completely changed macro architecture
• respects ids as URIs, has correct id resolution
• able to obtain remoteRfs
• optional RFC/standards-correct parsing of all "standardized format"s as set forth in the JSONSchema standard.

Benchmarks (generally ~3-5x faster than ExJsonSchema/JsonXema) are shown here: Exonerate/bench/reports/lib-bench.md at master · E-xyza/Exonerate · GitHub

Looks very cool. Do I get it correctly that the schema needs to exist at compile time? Any way to make it work with schemas coming from a database, for example?

It must exist at compile time. If you need dynamic schemas you’ll probably need JSONschema or ex_json_schema… Unless you have full control (not user input) in which case you can go nuts and make as many modules as you want at runtime

I should probably give a concrete example. Supposing the schemas stored in the database are yours and not users’ you could do this:

defmodule MyApp.Validators do
  def make_from_db do
    Db.Schemas.get_all()
    |> Enum.map(&to_module/1)
    |> Enum.each(&Code.compile_quoted/1)
    :ok
  end
  defp to_module(schema) do
    module_name = :"validator_#{schema.name}"
    module_schema = Jason.encode!(schema.json) # assuming it's JSONB column
    common_options = [...]
    quote do
      defmodule unquote(module_name) do
        require Exonerate
        Exonerate.function_from_string(:def, :validate, unquote(module_schema), unquote(common_options))
      end
    end
  end
end

Thanks. That could work for my case.

updated exonerate to version 0.3.2.

A few highlights of changes:

• faster array items handling
• allows registering resources for repeated use in functions
• fixed nested not in unevaluatedItems
• dump: true now generates code that you can copy-paste into a .ex or .exs file for correct compilation

Does this project have any differences and advantages compared to GitHub - jonasschmidt/ex_json_schema: An Elixir JSON Schema validator · GitHub?

It supports all of the JSONschema drafts up to 2020. ExJsonSchema only goes up to draft 7. Also it’s about 3x faster. May or may not be important, but it’s a runtime: false library so your release payload will be much smaller.