diff --git a/lib/dry/schema/extensions/json_schema/schema_compiler.rb b/lib/dry/schema/extensions/json_schema/schema_compiler.rb
index 9400912b..e5eb87d8 100644
--- a/lib/dry/schema/extensions/json_schema/schema_compiler.rb
+++ b/lib/dry/schema/extensions/json_schema/schema_compiler.rb
@@ -28,6 +28,14 @@ class SchemaCompiler
           time?: {type: "string", format: "time"},
           min_size?: {minLength: TO_INTEGER},
           max_size?: {maxLength: TO_INTEGER},
+          size?: {maxLength: TO_INTEGER, minLength: TO_INTEGER},
+          format?: {
+            pattern: proc do |x|
+              x.to_s.delete_prefix("(?-mix").delete_suffix(")")
+            end
+          },
+          true?: {},
+          false?: {},
           included_in?: {enum: ->(v, _) { v.to_a }},
           filled?: EMPTY_HASH,
           uri?: {format: "uri"},