diff --git a/cmd/tools/fuzz/fuzz.sh b/cmd/tools/fuzz/fuzz.sh
new file mode 100644
index 0000000000..cbba7d722f
--- /dev/null
+++ b/cmd/tools/fuzz/fuzz.sh
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+cores=$(nproc --all)
+
+echo Number of cores: $cores
+echo Compiling...
+./v -cc clang -o cmd/tools/fuzz/map_fuzz cmd/tools/fuzz/map_fuzz.v -prod -cflags "-fsanitize=memory"
+
+echo Fuzzing:
+while true
+do
+  for ((i=1;i<=cores;++i))
+  do
+    sleep 0.001
+    ./cmd/tools/fuzz/map_fuzz &
+  done
+  wait
+done
diff --git a/cmd/tools/fuzz/map_fuzz.v b/cmd/tools/fuzz/map_fuzz.v
new file mode 100644
index 0000000000..f1c62f2d56
--- /dev/null
+++ b/cmd/tools/fuzz/map_fuzz.v
@@ -0,0 +1,144 @@
+import rand
+import time
+
+fn generate_strings(str_len int, arr_len int) []string {
+	mut arr := []string{len: arr_len}
+	for i in 0 .. arr_len {
+		arr[i] = rand.string(str_len)
+	}
+	return arr
+}
+
+fn fuzz1() {
+	amount := 200000 - rand.intn(100000)
+	amount2 := 200000 - rand.intn(100000)
+	len := 25 - rand.intn(10)
+	arr := generate_strings(len, amount)
+	arr2 := generate_strings(len, amount2)
+	mut m := map[string]int{}
+	for i in 0 .. amount {
+		m[arr[i]] = i
+		assert i == m[arr[i]]
+	}
+	for i in 0 .. amount {
+		assert i == m[arr[i]]
+	}
+	for i in 0 .. amount2 {
+		assert 0 == m[arr2[i]]
+	}
+	unsafe {
+		m.free()
+		arr.free()
+	}
+}
+
+fn fuzz2() {
+	mut m := map[string]int{}
+	amount := rand.intn(500000) + 1
+	len := 25 - rand.intn(10)
+	arr := generate_strings(len, amount)
+	for i, x in arr {
+		m[x] = i
+	}
+	mut i := 0
+	for key, val in m {
+		assert key == arr[i]
+		assert val == i
+		i++
+	}
+	unsafe {
+		m.free()
+		arr.free()
+	}
+}
+
+fn fuzz3() {
+	mut m := map[string]int{}
+	amount := rand.intn(500000) + 1
+	len := 25 - rand.intn(10)
+	arr := generate_strings(len, amount)
+	for i, x in arr {
+		if (i % 10000) == 0 {
+			keys := m.keys()
+			assert keys.len == i
+			assert keys == arr[0..i]
+		}
+		m[x] = i
+	}
+	assert m.keys() == arr
+	assert m.keys().len == amount
+	unsafe {
+		m.free()
+		arr.free()
+	}
+}
+
+fn fuzz4() {
+	amount := rand.intn(500000)
+	len := 25 - rand.intn(10)
+	arr := generate_strings(len, amount)
+	mut m := map[string]int{}
+	for i in 0 .. amount {
+		m[arr[i]] = i
+	}
+	for i in 0 .. amount {
+		m.delete(arr[i])
+		assert m[arr[i]] == 0
+	}
+	assert m.len == 0
+	unsafe {
+		m.free()
+		arr.free()
+	}
+}
+
+fn fuzz5() {
+	amount := rand.intn(500000) + 1
+	arr := generate_strings(20, amount)
+	mut m := map[string]int{}
+	for i in 0 .. amount {
+		m[arr[i]] = i
+		assert (arr[i] in m) == true
+	}
+	for i in 0 .. amount {
+		m.delete(arr[i])
+		assert (arr[i] !in m) == true
+		assert m.len == amount - i - 1
+	}
+	assert m.len == 0
+	unsafe {
+		m.free()
+		arr.free()
+	}
+}
+
+fn fuzz6() {
+	mut m := map[string]int{}
+	amount := rand.intn(500000) + 1
+	len := 25 - rand.intn(10)
+	arr := generate_strings(len, amount)
+	for i, x in arr {
+		m[x]++
+		m[x] += i
+		assert m[x] == i + 1
+	}
+	for i, x in arr {
+		assert m[x] == i + 1
+	}
+	unsafe {
+		m.free()
+		arr.free()
+	}
+}
+
+fn main() {
+	seed := u32(time.ticks())
+	println('seed: $seed.hex()')
+	rand.seed([seed, seed])
+	fuzz1()
+	fuzz2()
+	fuzz3()
+	fuzz4()
+	fuzz5()
+	fuzz6()
+}