diff --git a/src/univers/version_range.py b/src/univers/version_range.py
index b6ac12b6..7a4a5205 100644
--- a/src/univers/version_range.py
+++ b/src/univers/version_range.py
@@ -223,6 +223,40 @@ def from_osv_v1(data, scheme):
     """
 
 
+def get_allof_constraints(cls, clause):
+    """
+    Return a list of VersionConstraint given an AllOf ``clause``.
+    """
+    if not isinstance(clause, AllOf):
+        raise ValueError(f"Unknown clause type: {clause!r}")
+    allof_constraints = []
+    for constraint in clause.clauses:
+        comparator = cls.vers_by_native_comparators[constraint.operator]
+        version = cls.version_class(str(constraint.target))
+        constraint = VersionConstraint(comparator=comparator, version=version)
+        allof_constraints.append(constraint)
+    return allof_constraints
+
+
+def get_npm_version_constraints_from_semver_npm_spec(string, cls):
+    """
+    Return a VersionConstraint for the provided ``string``.
+    """
+    spec = semantic_version.NpmSpec(string)
+    clause = spec.clause.simplify()
+    if isinstance(clause, (AnyOf, AllOf)):
+        anyof_constraints = []
+        if isinstance(clause, AnyOf):
+            for allof_clause in clause.clauses:
+                anyof_constraints.extend(get_allof_constraints(cls, allof_clause))
+        elif isinstance(clause, AllOf):
+            alloc = get_allof_constraints(cls, clause)
+            anyof_constraints.extend(alloc)
+        else:
+            raise ValueError(f"Unknown clause type: {spec!r}")
+    return anyof_constraints
+
+
 class NpmVersionRange(VersionRange):
     scheme = "npm"
     version_class = versions.SemverVersion
@@ -245,35 +279,71 @@ def from_native(cls, string):
 
         # an NpmSpec handles parsing of both the semver versions and node-semver
         # ranges at once
-        spec = semantic_version.NpmSpec(string)
-
-        clause = spec.clause.simplify()
-        assert isinstance(clause, (AnyOf, AllOf))
-        anyof_constraints = []
-        if isinstance(clause, AnyOf):
-            for allof_clause in clause.clauses:
-                anyof_constraints.extend(get_allof_constraints(cls, allof_clause))
-        elif isinstance(clause, AllOf):
-            alloc = get_allof_constraints(cls, clause)
-            anyof_constraints.extend(alloc)
-        else:
-            raise ValueError(f"Unknown clause type: {spec!r}")
-
-        return cls(constraints=anyof_constraints)
 
+        if string == "*":
+            return cls(
+                constraints=[
+                    VersionConstraint.from_string(string="*", version_class=cls.version_class)
+                ]
+            )
 
-def get_allof_constraints(cls, clause):
-    """
-    Return a list of VersionConstraint given an AllOf ``clause``.
-    """
-    assert isinstance(clause, AllOf)
-    allof_constraints = []
-    for constraint in clause.clauses:
-        comparator = cls.vers_by_native_comparators[constraint.operator]
-        version = cls.version_class(str(constraint.target))
-        constraint = VersionConstraint(comparator=comparator, version=version)
-        allof_constraints.append(constraint)
-    return allof_constraints
+        constraints = []
+        vrc = cls.version_class
+        # A constraint item can be a comparator or a version or a version with comparator
+        # If it's empty continue
+        # If it's in `vers_by_native_comparators`, append it with the comparator and continue
+        # If it's a version, make version constraint from the version and use the comparator from the previous item and make comparator empty
+        # If it's a version with comparator, use split_req to get version and comparator to form constraint and make comparator empty
+
+        for range in string.split("||"):
+            if " - " in range:
+                constraints.extend(
+                    get_npm_version_constraints_from_semver_npm_spec(string=range, cls=cls)
+                )
+                continue
+            comparator = ""
+            for constraint in range.split():
+                cmp = "".join([comparator, constraint])
+                if cmp in cls.vers_by_native_comparators:
+                    comparator = cls.vers_by_native_comparators[cmp]
+                    continue
+                if comparator:
+                    if constraint.endswith(".x"):
+                        constraints.extend(
+                            get_npm_version_constraints_from_semver_npm_spec(
+                                string=constraint, cls=cls
+                            )
+                        )
+                    else:
+                        constraint = constraint.lstrip("vV")
+                        constraints.append(
+                            VersionConstraint(comparator=comparator, version=vrc(constraint))
+                        )
+                else:
+                    if (
+                        constraint.endswith(".x")
+                        or constraint.startswith("~")
+                        or constraint.startswith("^")
+                    ):
+                        constraints.extend(
+                            get_npm_version_constraints_from_semver_npm_spec(
+                                string=constraint, cls=cls
+                            )
+                        )
+                    else:
+                        comparator, version_constraint = split_req(
+                            string=constraint,
+                            comparators=cls.vers_by_native_comparators,
+                            default="=",
+                        )
+                        version_constraint = version_constraint.lstrip("vV")
+                        constraints.append(
+                            VersionConstraint(
+                                comparator=comparator, version=vrc(version_constraint)
+                            )
+                        )
+                comparator = ""
+        return cls(constraints=constraints)
 
 
 class GemVersionRange(VersionRange):
diff --git a/tests/data/npm_advisory.json b/tests/data/npm_advisory.json
new file mode 100644
index 00000000..9d961e95
--- /dev/null
+++ b/tests/data/npm_advisory.json
@@ -0,0 +1,5312 @@
+[
+  {
+    "test_index": 1,
+    "scheme": "npm",
+    "npm_native": ">=4.1.0",
+    "expected_vers": "vers:npm/>=4.1.0"
+  },
+  {
+    "test_index": 2,
+    "scheme": "npm",
+    "npm_native": ">=2.0.0 <=4.0.4",
+    "expected_vers": "vers:npm/>=2.0.0|<=4.0.4"
+  },
+  {
+    "test_index": 3,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 4,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 5,
+    "scheme": "npm",
+    "npm_native": ">=2.11.2",
+    "expected_vers": "vers:npm/>=2.11.2"
+  },
+  {
+    "test_index": 6,
+    "scheme": "npm",
+    "npm_native": "<2.11.2",
+    "expected_vers": "vers:npm/<2.11.2"
+  },
+  {
+    "test_index": 7,
+    "scheme": "npm",
+    "npm_native": "<=0.6.2",
+    "expected_vers": "vers:npm/<=0.6.2"
+  },
+  {
+    "test_index": 8,
+    "scheme": "npm",
+    "npm_native": ">=0.9.0",
+    "expected_vers": "vers:npm/>=0.9.0"
+  },
+  {
+    "test_index": 9,
+    "scheme": "npm",
+    "npm_native": "<=0.8.4",
+    "expected_vers": "vers:npm/<=0.8.4"
+  },
+  {
+    "test_index": 10,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 11,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 12,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 13,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 14,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 15,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 16,
+    "scheme": "npm",
+    "npm_native": ">= 1.6.9",
+    "expected_vers": "vers:npm/>=1.6.9"
+  },
+  {
+    "test_index": 17,
+    "scheme": "npm",
+    "npm_native": "<= 1.6.8",
+    "expected_vers": "vers:npm/<=1.6.8"
+  },
+  {
+    "test_index": 18,
+    "scheme": "npm",
+    "npm_native": "<=3.9.2",
+    "expected_vers": "vers:npm/<=3.9.2"
+  },
+  {
+    "test_index": 19,
+    "scheme": "npm",
+    "npm_native": ">=9.1.6",
+    "expected_vers": "vers:npm/>=9.1.6"
+  },
+  {
+    "test_index": 20,
+    "scheme": "npm",
+    "npm_native": "<=9.1.5",
+    "expected_vers": "vers:npm/<=9.1.5"
+  },
+  {
+    "test_index": 21,
+    "scheme": "npm",
+    "npm_native": ">=1.0.0",
+    "expected_vers": "vers:npm/>=1.0.0"
+  },
+  {
+    "test_index": 22,
+    "scheme": "npm",
+    "npm_native": "<=0.5.0",
+    "expected_vers": "vers:npm/<=0.5.0"
+  },
+  {
+    "test_index": 23,
+    "scheme": "npm",
+    "npm_native": ">=1.8.10",
+    "expected_vers": "vers:npm/>=1.8.10"
+  },
+  {
+    "test_index": 24,
+    "scheme": "npm",
+    "npm_native": "<1.8.10",
+    "expected_vers": "vers:npm/<1.8.10"
+  },
+  {
+    "test_index": 25,
+    "scheme": "npm",
+    "npm_native": ">=1.4.1",
+    "expected_vers": "vers:npm/>=1.4.1"
+  },
+  {
+    "test_index": 26,
+    "scheme": "npm",
+    "npm_native": "<=1.4.0",
+    "expected_vers": "vers:npm/<=1.4.0"
+  },
+  {
+    "test_index": 27,
+    "scheme": "npm",
+    "npm_native": ">= 16.1.1",
+    "expected_vers": "vers:npm/>=16.1.1"
+  },
+  {
+    "test_index": 28,
+    "scheme": "npm",
+    "npm_native": ">= 15.0.0 <= 16.1.0",
+    "expected_vers": "vers:npm/>=15.0.0|<=16.1.0"
+  },
+  {
+    "test_index": 29,
+    "scheme": "npm",
+    "npm_native": ">0.12.7",
+    "expected_vers": "vers:npm/>0.12.7"
+  },
+  {
+    "test_index": 30,
+    "scheme": "npm",
+    "npm_native": "<=0.12.7",
+    "expected_vers": "vers:npm/<=0.12.7"
+  },
+  {
+    "test_index": 31,
+    "scheme": "npm",
+    "npm_native": "*",
+    "expected_vers": "vers:npm/*"
+  },
+  {
+    "test_index": 32,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 33,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 34,
+    "scheme": "npm",
+    "npm_native": ">=2.1.5",
+    "expected_vers": "vers:npm/>=2.1.5"
+  },
+  {
+    "test_index": 35,
+    "scheme": "npm",
+    "npm_native": "2.1.4",
+    "expected_vers": "vers:npm/2.1.4"
+  },
+  {
+    "test_index": 36,
+    "scheme": "npm",
+    "npm_native": ">=1.0.0",
+    "expected_vers": "vers:npm/>=1.0.0"
+  },
+  {
+    "test_index": 37,
+    "scheme": "npm",
+    "npm_native": "<1.0.0",
+    "expected_vers": "vers:npm/<1.0.0"
+  },
+  {
+    "test_index": 38,
+    "scheme": "npm",
+    "npm_native": ">= 6.1.0",
+    "expected_vers": "vers:npm/>=6.1.0"
+  },
+  {
+    "test_index": 39,
+    "scheme": "npm",
+    "npm_native": "< 6.1.0",
+    "expected_vers": "vers:npm/<6.1.0"
+  },
+  {
+    "test_index": 40,
+    "scheme": "npm",
+    "npm_native": "*",
+    "expected_vers": "vers:npm/*"
+  },
+  {
+    "test_index": 41,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 42,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 43,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 44,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 45,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 46,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 47,
+    "scheme": "npm",
+    "npm_native": ">=1.4.0",
+    "expected_vers": "vers:npm/>=1.4.0"
+  },
+  {
+    "test_index": 48,
+    "scheme": "npm",
+    "npm_native": "<1.4.0",
+    "expected_vers": "vers:npm/<1.4.0"
+  },
+  {
+    "test_index": 49,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 50,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 51,
+    "scheme": "npm",
+    "npm_native": ">= 3.0.0",
+    "expected_vers": "vers:npm/>=3.0.0"
+  },
+  {
+    "test_index": 52,
+    "scheme": "npm",
+    "npm_native": "<= 2.1.3",
+    "expected_vers": "vers:npm/<=2.1.3"
+  },
+  {
+    "test_index": 53,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 54,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 55,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 56,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 57,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 58,
+    "scheme": "npm",
+    "npm_native": "<=0.0.5",
+    "expected_vers": "vers:npm/<=0.0.5"
+  },
+  {
+    "test_index": 59,
+    "scheme": "npm",
+    "npm_native": ">=3.4.0",
+    "expected_vers": "vers:npm/>=3.4.0"
+  },
+  {
+    "test_index": 60,
+    "scheme": "npm",
+    "npm_native": "<3.4.0",
+    "expected_vers": "vers:npm/<3.4.0"
+  },
+  {
+    "test_index": 61,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 62,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 63,
+    "scheme": "npm",
+    "npm_native": ">=3.0.2",
+    "expected_vers": "vers:npm/>=3.0.2"
+  },
+  {
+    "test_index": 64,
+    "scheme": "npm",
+    "npm_native": ">= 2.0.1 <3.0.2",
+    "expected_vers": "vers:npm/>=2.0.1|<3.0.2"
+  },
+  {
+    "test_index": 65,
+    "scheme": "npm",
+    "npm_native": "<=2.0.2",
+    "expected_vers": "vers:npm/<=2.0.2"
+  },
+  {
+    "test_index": 66,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 67,
+    "scheme": "npm",
+    "npm_native": "<99.999.9999",
+    "expected_vers": "vers:npm/<99.999.9999"
+  },
+  {
+    "test_index": 68,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 69,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 70,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 71,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 72,
+    "scheme": "npm",
+    "npm_native": ">= 1.0.4",
+    "expected_vers": "vers:npm/>=1.0.4"
+  },
+  {
+    "test_index": 73,
+    "scheme": "npm",
+    "npm_native": "<= 1.0.3",
+    "expected_vers": "vers:npm/<=1.0.3"
+  },
+  {
+    "test_index": 74,
+    "scheme": "npm",
+    "npm_native": ">=1.5.2 || >=1.4.11 <1.5.0 || >=1.3.2 <1.4.0",
+    "expected_vers": "vers:npm/>=1.3.2|<1.4.0|>=1.4.11|<1.5.0|>=1.5.2"
+  },
+  {
+    "test_index": 75,
+    "scheme": "npm",
+    "npm_native": ">=1.3.0 <1.3.2 || >=1.4.0 <1.4.11 || >=1.5.0 <1.5.2",
+    "expected_vers": "vers:npm/>=1.3.0|<1.3.2|>=1.4.0|<1.4.11|>=1.5.0|<1.5.2"
+  },
+  {
+    "test_index": 76,
+    "scheme": "npm",
+    "npm_native": ">=2.1.3",
+    "expected_vers": "vers:npm/>=2.1.3"
+  },
+  {
+    "test_index": 77,
+    "scheme": "npm",
+    "npm_native": "<=2.1.2",
+    "expected_vers": "vers:npm/<=2.1.2"
+  },
+  {
+    "test_index": 78,
+    "scheme": "npm",
+    "npm_native": "<=3.2.0",
+    "expected_vers": "vers:npm/<=3.2.0"
+  },
+  {
+    "test_index": 79,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 80,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 81,
+    "scheme": "npm",
+    "npm_native": ">=1.0.0",
+    "expected_vers": "vers:npm/>=1.0.0"
+  },
+  {
+    "test_index": 82,
+    "scheme": "npm",
+    "npm_native": "<1.0.0",
+    "expected_vers": "vers:npm/<1.0.0"
+  },
+  {
+    "test_index": 83,
+    "scheme": "npm",
+    "npm_native": ">=0.7.0",
+    "expected_vers": "vers:npm/>=0.7.0"
+  },
+  {
+    "test_index": 84,
+    "scheme": "npm",
+    "npm_native": "<=0.6.6",
+    "expected_vers": "vers:npm/<=0.6.6"
+  },
+  {
+    "test_index": 85,
+    "scheme": "npm",
+    "npm_native": ">=1.0.6",
+    "expected_vers": "vers:npm/>=1.0.6"
+  },
+  {
+    "test_index": 86,
+    "scheme": "npm",
+    "npm_native": "<=1.0.5",
+    "expected_vers": "vers:npm/<=1.0.5"
+  },
+  {
+    "test_index": 87,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 88,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 89,
+    "scheme": "npm",
+    "npm_native": ">=3.0.2",
+    "expected_vers": "vers:npm/>=3.0.2"
+  },
+  {
+    "test_index": 90,
+    "scheme": "npm",
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+    "scheme": "npm",
+    "npm_native": "3.7.2",
+    "expected_vers": "vers:npm/3.7.2"
+  },
+  {
+    "test_index": 777,
+    "scheme": "npm",
+    "npm_native": ">=0.1.2",
+    "expected_vers": "vers:npm/>=0.1.2"
+  },
+  {
+    "test_index": 778,
+    "scheme": "npm",
+    "npm_native": "<0.1.2",
+    "expected_vers": "vers:npm/<0.1.2"
+  },
+  {
+    "test_index": 779,
+    "scheme": "npm",
+    "npm_native": "<=0.13.12",
+    "expected_vers": "vers:npm/<=0.13.12"
+  },
+  {
+    "test_index": 780,
+    "scheme": "npm",
+    "npm_native": "*",
+    "expected_vers": "vers:npm/*"
+  },
+  {
+    "test_index": 781,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 782,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 783,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 784,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 785,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 786,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 787,
+    "scheme": "npm",
+    "npm_native": ">=3.0.4",
+    "expected_vers": "vers:npm/>=3.0.4"
+  },
+  {
+    "test_index": 788,
+    "scheme": "npm",
+    "npm_native": "<3.0.4",
+    "expected_vers": "vers:npm/<3.0.4"
+  },
+  {
+    "test_index": 789,
+    "scheme": "npm",
+    "npm_native": ">=1.0.7",
+    "expected_vers": "vers:npm/>=1.0.7"
+  },
+  {
+    "test_index": 790,
+    "scheme": "npm",
+    "npm_native": "<=1.0.6",
+    "expected_vers": "vers:npm/<=1.0.6"
+  },
+  {
+    "test_index": 791,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 792,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 793,
+    "scheme": "npm",
+    "npm_native": ">=1.3.1",
+    "expected_vers": "vers:npm/>=1.3.1"
+  },
+  {
+    "test_index": 794,
+    "scheme": "npm",
+    "npm_native": "<1.3.1",
+    "expected_vers": "vers:npm/<1.3.1"
+  },
+  {
+    "test_index": 795,
+    "scheme": "npm",
+    "npm_native": "> 2.4.3",
+    "expected_vers": "vers:npm/>2.4.3"
+  },
+  {
+    "test_index": 796,
+    "scheme": "npm",
+    "npm_native": "<= 2.4.3",
+    "expected_vers": "vers:npm/<=2.4.3"
+  },
+  {
+    "test_index": 797,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 798,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 799,
+    "scheme": "npm",
+    "npm_native": ">=0.2.3",
+    "expected_vers": "vers:npm/>=0.2.3"
+  },
+  {
+    "test_index": 800,
+    "scheme": "npm",
+    "npm_native": "<0.2.3",
+    "expected_vers": "vers:npm/<0.2.3"
+  },
+  {
+    "test_index": 801,
+    "scheme": "npm",
+    "npm_native": ">=1.2.4",
+    "expected_vers": "vers:npm/>=1.2.4"
+  },
+  {
+    "test_index": 802,
+    "scheme": "npm",
+    "npm_native": "<=1.2.3",
+    "expected_vers": "vers:npm/<=1.2.3"
+  },
+  {
+    "test_index": 803,
+    "scheme": "npm",
+    "npm_native": "<=1.0.2",
+    "expected_vers": "vers:npm/<=1.0.2"
+  },
+  {
+    "test_index": 804,
+    "scheme": "npm",
+    "npm_native": ">=1.4.4",
+    "expected_vers": "vers:npm/>=1.4.4"
+  },
+  {
+    "test_index": 805,
+    "scheme": "npm",
+    "npm_native": "<1.4.4",
+    "expected_vers": "vers:npm/<1.4.4"
+  },
+  {
+    "test_index": 806,
+    "scheme": "npm",
+    "npm_native": ">=1.4.3",
+    "expected_vers": "vers:npm/>=1.4.3"
+  },
+  {
+    "test_index": 807,
+    "scheme": "npm",
+    "npm_native": "<=1.4.2",
+    "expected_vers": "vers:npm/<=1.4.2"
+  },
+  {
+    "test_index": 808,
+    "scheme": "npm",
+    "npm_native": ">=2.1.0",
+    "expected_vers": "vers:npm/>=2.1.0"
+  },
+  {
+    "test_index": 809,
+    "scheme": "npm",
+    "npm_native": "<=2.0.0",
+    "expected_vers": "vers:npm/<=2.0.0"
+  },
+  {
+    "test_index": 810,
+    "scheme": "npm",
+    "npm_native": ">=0.6.0",
+    "expected_vers": "vers:npm/>=0.6.0"
+  },
+  {
+    "test_index": 811,
+    "scheme": "npm",
+    "npm_native": "<0.6.0",
+    "expected_vers": "vers:npm/<0.6.0"
+  },
+  {
+    "test_index": 812,
+    "scheme": "npm",
+    "npm_native": ">=1.1.5",
+    "expected_vers": "vers:npm/>=1.1.5"
+  },
+  {
+    "test_index": 813,
+    "scheme": "npm",
+    "npm_native": "<=1.1.4",
+    "expected_vers": "vers:npm/<=1.1.4"
+  },
+  {
+    "test_index": 814,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 815,
+    "scheme": "npm",
+    "npm_native": "<=2.0.2",
+    "expected_vers": "vers:npm/<=2.0.2"
+  },
+  {
+    "test_index": 816,
+    "scheme": "npm",
+    "npm_native": ">=4.0.0",
+    "expected_vers": "vers:npm/>=4.0.0"
+  },
+  {
+    "test_index": 817,
+    "scheme": "npm",
+    "npm_native": "<4.0.0",
+    "expected_vers": "vers:npm/<4.0.0"
+  },
+  {
+    "test_index": 818,
+    "scheme": "npm",
+    "npm_native": ">=2.12.4",
+    "expected_vers": "vers:npm/>=2.12.4"
+  },
+  {
+    "test_index": 819,
+    "scheme": "npm",
+    "npm_native": "<=2.12.3",
+    "expected_vers": "vers:npm/<=2.12.3"
+  },
+  {
+    "test_index": 820,
+    "scheme": "npm",
+    "npm_native": ">=0.0.3",
+    "expected_vers": "vers:npm/>=0.0.3"
+  },
+  {
+    "test_index": 821,
+    "scheme": "npm",
+    "npm_native": "<0.0.3",
+    "expected_vers": "vers:npm/<0.0.3"
+  },
+  {
+    "test_index": 822,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 823,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 824,
+    "scheme": "npm",
+    "npm_native": ">1.10.8",
+    "expected_vers": "vers:npm/>1.10.8"
+  },
+  {
+    "test_index": 825,
+    "scheme": "npm",
+    "npm_native": "<=1.10.8",
+    "expected_vers": "vers:npm/<=1.10.8"
+  },
+  {
+    "test_index": 826,
+    "scheme": "npm",
+    "npm_native": "*",
+    "expected_vers": "vers:npm/*"
+  },
+  {
+    "test_index": 827,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 828,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 829,
+    "scheme": "npm",
+    "npm_native": ">=1.4.2",
+    "expected_vers": "vers:npm/>=1.4.2"
+  },
+  {
+    "test_index": 830,
+    "scheme": "npm",
+    "npm_native": "<=1.4.1",
+    "expected_vers": "vers:npm/<=1.4.1"
+  },
+  {
+    "test_index": 831,
+    "scheme": "npm",
+    "npm_native": "<=1.0.2",
+    "expected_vers": "vers:npm/<=1.0.2"
+  },
+  {
+    "test_index": 832,
+    "scheme": "npm",
+    "npm_native": "<=1.1.8",
+    "expected_vers": "vers:npm/<=1.1.8"
+  },
+  {
+    "test_index": 833,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 834,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 835,
+    "scheme": "npm",
+    "npm_native": ">=0.3.3",
+    "expected_vers": "vers:npm/>=0.3.3"
+  },
+  {
+    "test_index": 836,
+    "scheme": "npm",
+    "npm_native": "<=0.3.2",
+    "expected_vers": "vers:npm/<=0.3.2"
+  },
+  {
+    "test_index": 837,
+    "scheme": "npm",
+    "npm_native": ">=0.1.1",
+    "expected_vers": "vers:npm/>=0.1.1"
+  },
+  {
+    "test_index": 838,
+    "scheme": "npm",
+    "npm_native": "<0.1.1",
+    "expected_vers": "vers:npm/<0.1.1"
+  },
+  {
+    "test_index": 839,
+    "scheme": "npm",
+    "npm_native": ">=0.3.0",
+    "expected_vers": "vers:npm/>=0.3.0"
+  },
+  {
+    "test_index": 840,
+    "scheme": "npm",
+    "npm_native": "<0.3.0",
+    "expected_vers": "vers:npm/<0.3.0"
+  },
+  {
+    "test_index": 841,
+    "scheme": "npm",
+    "npm_native": "~0.2.2 || >=0.3.2",
+    "expected_vers": "vers:npm/>=0.2.2|<0.3.0|>=0.3.2"
+  },
+  {
+    "test_index": 842,
+    "scheme": "npm",
+    "npm_native": "<0.2.2 || >=0.3.0 <0.3.2",
+    "expected_vers": "vers:npm/<0.2.2|>=0.3.0|<0.3.2"
+  },
+  {
+    "test_index": 843,
+    "scheme": "npm",
+    "npm_native": ">= 7.0.0",
+    "expected_vers": "vers:npm/>=7.0.0"
+  },
+  {
+    "test_index": 844,
+    "scheme": "npm",
+    "npm_native": ">= 5.2.1 <= 6.0.0 || >=6.0.0 <= 6.0.2",
+    "expected_vers": "vers:npm/>=5.2.1|<=6.0.0|>=6.0.0|<=6.0.2"
+  },
+  {
+    "test_index": 845,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 846,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 847,
+    "scheme": "npm",
+    "npm_native": "<=0.0.6",
+    "expected_vers": "vers:npm/<=0.0.6"
+  },
+  {
+    "test_index": 848,
+    "scheme": "npm",
+    "npm_native": ">=1.4.1 <2.0.0 || >=2.17.2",
+    "expected_vers": "vers:npm/>=1.4.1|<2.0.0|>=2.17.2"
+  },
+  {
+    "test_index": 849,
+    "scheme": "npm",
+    "npm_native": "<1.4.1 || >=2.0.0 <2.17.2",
+    "expected_vers": "vers:npm/<1.4.1|>=2.0.0|<2.17.2"
+  },
+  {
+    "test_index": 850,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 851,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 852,
+    "scheme": "npm",
+    "npm_native": ">=0.3.16",
+    "expected_vers": "vers:npm/>=0.3.16"
+  },
+  {
+    "test_index": 853,
+    "scheme": "npm",
+    "npm_native": "<0.3.16",
+    "expected_vers": "vers:npm/<0.3.16"
+  },
+  {
+    "test_index": 854,
+    "scheme": "npm",
+    "npm_native": "<=0.2.2",
+    "expected_vers": "vers:npm/<=0.2.2"
+  },
+  {
+    "test_index": 855,
+    "scheme": "npm",
+    "npm_native": "<=0.2.4",
+    "expected_vers": "vers:npm/<=0.2.4"
+  },
+  {
+    "test_index": 856,
+    "scheme": "npm",
+    "npm_native": ">=2.2.5",
+    "expected_vers": "vers:npm/>=2.2.5"
+  },
+  {
+    "test_index": 857,
+    "scheme": "npm",
+    "npm_native": "<2.2.5",
+    "expected_vers": "vers:npm/<2.2.5"
+  },
+  {
+    "test_index": 858,
+    "scheme": "npm",
+    "npm_native": "<=0.2.0",
+    "expected_vers": "vers:npm/<=0.2.0"
+  },
+  {
+    "test_index": 859,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 860,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 861,
+    "scheme": "npm",
+    "npm_native": ">=1.0.1",
+    "expected_vers": "vers:npm/>=1.0.1"
+  },
+  {
+    "test_index": 862,
+    "scheme": "npm",
+    "npm_native": "<1.0.1",
+    "expected_vers": "vers:npm/<1.0.1"
+  },
+  {
+    "test_index": 863,
+    "scheme": "npm",
+    "npm_native": "<=0.0.9",
+    "expected_vers": "vers:npm/<=0.0.9"
+  },
+  {
+    "test_index": 864,
+    "scheme": "npm",
+    "npm_native": ">=0.9.7",
+    "expected_vers": "vers:npm/>=0.9.7"
+  },
+  {
+    "test_index": 865,
+    "scheme": "npm",
+    "npm_native": "<=0.9.6",
+    "expected_vers": "vers:npm/<=0.9.6"
+  },
+  {
+    "test_index": 866,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 867,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 868,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 869,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 870,
+    "scheme": "npm",
+    "npm_native": ">=2.4.2",
+    "expected_vers": "vers:npm/>=2.4.2"
+  },
+  {
+    "test_index": 871,
+    "scheme": "npm",
+    "npm_native": "<2.4.2",
+    "expected_vers": "vers:npm/<2.4.2"
+  },
+  {
+    "test_index": 872,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 873,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 874,
+    "scheme": "npm",
+    "npm_native": ">=1.2.2",
+    "expected_vers": "vers:npm/>=1.2.2"
+  },
+  {
+    "test_index": 875,
+    "scheme": "npm",
+    "npm_native": "<1.2.2",
+    "expected_vers": "vers:npm/<1.2.2"
+  },
+  {
+    "test_index": 876,
+    "scheme": "npm",
+    "npm_native": "<0.0.0",
+    "expected_vers": "vers:npm/<0.0.0"
+  },
+  {
+    "test_index": 877,
+    "scheme": "npm",
+    "npm_native": "<=99.999.99999",
+    "expected_vers": "vers:npm/<=99.999.99999"
+  },
+  {
+    "test_index": 878,
+    "scheme": "npm",
+    "npm_native": ">=3.0.1",
+    "expected_vers": "vers:npm/>=3.0.1"
+  },
+  {
+    "test_index": 879,
+    "scheme": "npm",
+    "npm_native": "<3.0.1",
+    "expected_vers": "vers:npm/<3.0.1"
+  },
+  {
+    "test_index": 880,
+    "scheme": "npm",
+    "npm_native": "^1.2.9",
+    "expected_vers": "vers:npm/>=1.2.9|<2.0.0"
+  },
+  {
+    "test_index": 881,
+    "scheme": "npm",
+    "npm_native": "~3.8.2",
+    "expected_vers": "vers:npm/>=3.8.2|<3.9.0"
+  },
+  {
+    "test_index": 882,
+    "scheme": "npm",
+    "npm_native": "5.0.0 - 7.2.3",
+    "expected_vers": "vers:npm/>=5.0.0|<=7.2.3"
+  },
+  {
+    "test_index": 883,
+    "scheme": "npm",
+    "npm_native": "2.1 || 2.6",
+    "expected_vers": "vers:npm/2.1.0|2.6.0"
+  },
+  {
+    "test_index": 884,
+    "scheme": "npm",
+    "npm_native": "1.1.2 1.2.2",
+    "expected_vers": "vers:npm/1.1.2|1.2.2"
+  },
+  {
+    "test_index": 885,
+    "scheme": "npm",
+    "npm_native": "<=2.1 >=1.1",
+    "expected_vers": "vers:npm/>=1.1.0|<=2.1.0"
+  }
+]
\ No newline at end of file
diff --git a/tests/test_version_range.py b/tests/test_version_range.py
index d56b7198..e2a02f37 100644
--- a/tests/test_version_range.py
+++ b/tests/test_version_range.py
@@ -281,7 +281,15 @@ def test_nuget_version_range(self):
 
 VERSION_RANGE_TESTS_BY_SCHEME = {
     "nginx": ["0.8.40+", "0.7.52-0.8.39", "0.9.10", "1.5.0+, 1.4.1+"],
-    "npm": ["^1.2.9", "~3.8.2", "5.0.0 - 7.2.3", "2.1 || 2.6", "1.1.2 1.2.2", "<=2.1 >=1.1"],
+    "npm": [
+        "^1.2.9",
+        "~3.8.2",
+        "5.0.0 - 7.2.3",
+        "2.1.0 || 2.6.0",
+        "1.1.2 1.2.2",
+        "<=2.1.0 >=1.1.0",
+        "1.2.x",
+    ],
     "openssl": ["1.1.1ak", "1.1.0", "3.0.2", "3.0.1, 0.9.7a", "1.0.2ck, 3.1.2"],
     "pypi": [">= 1.0", "<2.1.0", "!=5"],
 }
@@ -377,3 +385,11 @@ def test_composer_gitlab_version_range_parse(test_case):
         string=test_case["gitlab_native"],
     )
     assert str(result) == test_case["expected_vers"]
+
+
+@pytest.mark.parametrize("test_case", json.load(open("./tests/data/npm_advisory.json")))
+def test_npm_advisory_version_range_parse(test_case):
+    result = NpmVersionRange.from_native(
+        string=test_case["npm_native"],
+    )
+    assert str(result) == test_case["expected_vers"]