--- a/Cargo.lock
+++ b/Cargo.lock
@@ -108,6 +108,7 @@
 name = "jrsonnet-evaluator"
 version = "1.0.0"
 dependencies = [
+ "base64",
  "bincode",
  "closure",
  "indexmap",
--- a/crates/jrsonnet-evaluator/Cargo.toml
+++ b/crates/jrsonnet-evaluator/Cargo.toml
@@ -24,6 +24,7 @@
 jrsonnet-stdlib = { path = "../jrsonnet-stdlib", version = "1.0.0" }
 indexmap = "1.4.0"
 md5 = "0.7.0"
+base64 = "0.12.3"
 
 serde = { version = "1.0.114", optional = true }
 bincode = { version = "1.3.1", optional = true }
--- a/crates/jrsonnet-evaluator/build.rs
+++ b/crates/jrsonnet-evaluator/build.rs
@@ -35,7 +35,7 @@
 								Member::Field(FieldMember {
 									name: FieldName::Fixed(name),
 									..
-								}) if **name == *"join" || **name == *"manifestJsonEx" || **name == *"escapeStringJson" || **name == *"equals"
+								}) if **name == *"join" || **name == *"manifestJsonEx" || **name == *"escapeStringJson" || **name == *"equals" || **name == *"base64"
 							)
 						})
 						.collect(),
--- a/crates/jrsonnet-evaluator/src/evaluate.rs
+++ b/crates/jrsonnet-evaluator/src/evaluate.rs
@@ -566,6 +566,22 @@
 				Ok(Val::Str(format!("{:x}", md5::compute(&str.as_bytes())).into()))
 			}))?,
 			// faster
+			("std", "base64") => parse_args!(context, "std.base64", args, 1, [
+				0, input: [Val::Str | Val::Arr], vec![ValType::Arr, ValType::Str];
+			], {
+				Val::Str(match input {
+					Val::Str(s) => {
+						base64::encode(s.bytes().collect::<Vec<_>>()).into()
+					},
+					Val::Arr(a) => {
+						base64::encode(a.iter().map(|v| {
+							Ok(v.clone().try_cast_num("base64 array")? as u8)
+						}).collect::<Result<Vec<_>>>()?).into()
+					},
+					_ => unreachable!()
+				})
+			}),
+			// faster
 			("std", "join") => noinline!(parse_args!(context, "std.join", args, 2, [
 				0, sep: [Val::Str|Val::Arr], vec![ValType::Str, ValType::Arr];
 				1, arr: [Val::Arr]!!Val::Arr, vec![ValType::Arr];