diff --git a/internal/magic/magic_test.go b/internal/magic/magic_test.go
new file mode 100644
index 00000000..f89aff84
--- /dev/null
+++ b/internal/magic/magic_test.go
@@ -0,0 +1,20 @@
+package magic
+
+import "testing"
+
+var magicTests = []struct {
+	raw      string
+	limit    uint32
+	res      bool
+	detector Detector
+}{
+	{`["an incomplete JSON array`, 0, false, JSON},
+}
+
+func TestMagic(t *testing.T) {
+	for i, tt := range magicTests {
+		if got := tt.detector([]byte(tt.raw), tt.limit); got != tt.res {
+			t.Errorf("Detector %d error: expected: %t; got: %t", i, tt.res, got)
+		}
+	}
+}
diff --git a/internal/magic/text.go b/internal/magic/text.go
index 026c6aad..40bfb190 100644
--- a/internal/magic/text.go
+++ b/internal/magic/text.go
@@ -155,12 +155,14 @@ func Php(raw []byte, limit uint32) bool {
 // JSON matches a JavaScript Object Notation file.
 func JSON(raw []byte, limit uint32) bool {
 	raw = trimLWS(raw)
-	if len(raw) == 0 || (raw[0] != '[' && raw[0] != '{') {
+	// #175 A single JSON string, number or bool is not considered JSON.
+	// JSON objects and arrays are reported as JSON.
+	if len(raw) < 2 || (raw[0] != '[' && raw[0] != '{') {
 		return false
 	}
 	parsed, err := json.Scan(raw)
 	// If the full file content was provided, check there is no error.
-	if len(raw) < int(limit) {
+	if limit == 0 || len(raw) < int(limit) {
 		return err == nil
 	}