diff --git a/sapling_generators.py b/sapling_generators.py
index 3007c6d..dd416bc 100644
--- a/sapling_generators.py
+++ b/sapling_generators.py
@@ -2,7 +2,7 @@
 from pyblake2 import blake2s
 
 from sapling_jubjub import Point, JUBJUB_COFACTOR
-from tv_output import tv_rust
+from tv_output import render_args, render_tv
 
 # First 64 bytes of the BLAKE2s input during group hash.
 # This is chosen to be some random string that we couldn't have
@@ -50,7 +50,8 @@ VALUE_COMMITMENT_RANDOMNESS_BASE = find_group_hash(b'Zcash_cv', b'r')
 
 
 def main():
-    tv_rust(
+    render_tv(
+        render_args(),
         'sapling_generators',
         (
             ('skb', '[u8; 32]'),
diff --git a/sapling_key_components.py b/sapling_key_components.py
index 40ada1f..3264029 100644
--- a/sapling_key_components.py
+++ b/sapling_key_components.py
@@ -6,7 +6,7 @@ from sapling_jubjub import Fr
 from sapling_merkle_tree import MERKLE_DEPTH
 from sapling_notes import note_commit, note_nullifier
 from sapling_utils import leos2bsp, leos2ip
-from tv_output import tv_rust
+from tv_output import render_args, render_tv
 
 #
 # Utilities
@@ -91,6 +91,8 @@ class SpendingKey(object):
 
 
 def main():
+    args = render_args()
+
     test_vectors = []
     for i in range(0, 10):
         sk = SpendingKey(bytes([i] * 32))
@@ -120,7 +122,8 @@ def main():
             'note_nf': note_nf,
         })
 
-    tv_rust(
+    render_tv(
+        args,
         'sapling_key_components',
         (
             ('sk', '[u8; 32]'),
diff --git a/sapling_signatures.py b/sapling_signatures.py
index 3088417..ead3bfd 100644
--- a/sapling_signatures.py
+++ b/sapling_signatures.py
@@ -6,7 +6,7 @@ from sapling_generators import SPENDING_KEY_BASE
 from sapling_jubjub import Fr, Point, r_j
 from sapling_key_components import to_scalar
 from sapling_utils import cldiv, leos2ip
-from tv_output import tv_rust
+from tv_output import render_args, render_tv
 
 
 def H(x):
@@ -65,6 +65,8 @@ class RedJubjub(object):
 
 
 def main():
+    args = render_args()
+
     from random import Random
     rng = Random(0xabad533d)
     def randbytes(l):
@@ -101,7 +103,8 @@ def main():
             'rsig': rsig,
         })
 
-    tv_rust(
+    render_tv(
+        args,
         'sapling_signatures',
         (
             ('sk', '[u8; 32]'),
diff --git a/tv_output.py b/tv_output.py
index 53c09b7..791934a 100644
--- a/tv_output.py
+++ b/tv_output.py
@@ -1,10 +1,42 @@
+import argparse
 from binascii import hexlify
+import json
 
 
 def chunk(h):
     h = str(h, 'utf-8')
     return '0x' + ', 0x'.join([h[i:i+2] for i in range(0, len(h), 2)])
 
+
+#
+# JSON (with string comments)
+#
+
+def tv_value_json(value):
+    if type(value) == bytes:
+        value = hexlify(value).decode()
+    return value
+
+def tv_json(filename, parts, vectors):
+    if type(vectors) == type({}):
+        vectors = [vectors]
+
+    print('''[
+    ["From https://github.com/zcash-hackworks/zcash-test-vectors/blob/master/%s.py"],
+    ["%s"],''' % (
+        filename,
+        ', '.join([p[0] for p in parts])
+    ))
+    print('    ' + ',\n    '.join([
+        json.dumps([tv_value_json(v[p[0]]) for p in parts]) for v in vectors
+    ]))
+    print(']')
+
+
+#
+# Rust
+#
+
 def tv_bytes_rust(name, value, pad):
     print('''%s%s: [
     %s%s
@@ -49,3 +81,19 @@ def tv_rust(filename, parts, vectors):
         print('        ];')
     else:
         raise ValueError('Invalid type(vectors)')
+
+
+#
+# Rendering functions
+#
+
+def render_args():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-t', '--target', choices=['json', 'rust'], default='rust')
+    return parser.parse_args()
+
+def render_tv(args, filename, parts, vectors):
+    if args.target == 'rust':
+        tv_rust(filename, parts, vectors)
+    elif args.target == 'json':
+        tv_json(filename, parts, vectors)