diff --git a/common/test/run-json_remove.c b/common/test/run-json_remove.c
new file mode 100644
index 000000000..5328e684a
--- /dev/null
+++ b/common/test/run-json_remove.c
@@ -0,0 +1,155 @@
+#include "config.h"
+#include <common/utils.h>
+#include <common/json.c>
+
+/* AUTOGENERATED MOCKS START */
+/* AUTOGENERATED MOCKS END */
+
+struct json {
+	jsmntok_t *toks;
+	char *buffer;
+};
+
+static void convert_quotes(char *first)
+{
+	while (*first != '\0') {
+		if (*first == '\'')
+			*first = '"';
+		first++;
+	}
+}
+
+static struct json *json_parse(const tal_t * ctx, const char *str)
+{
+	struct json *j = tal(ctx, struct json);
+	j->buffer = tal_strdup(j, str);
+	convert_quotes(j->buffer);
+	bool ok;
+	j->toks = json_parse_input(j->buffer, strlen(j->buffer), &ok);
+	assert(ok);
+	j->toks = json_tok_copy(j, j->toks);
+	return j;
+}
+
+static void test_toks(const struct json *j, ...)
+{
+	const jsmntok_t * tok = j->toks + 1;
+	const char *value;
+	va_list(ap);
+	va_start(ap, j);
+	while ((value = va_arg(ap, char *)) != NULL) {
+		assert(json_tok_streq(j->buffer, tok, value));
+		tok++;
+	}
+}
+
+static void sanity(void)
+{
+	struct json *j = json_parse(tmpctx, "[]");
+	json_tok_remove(&j->toks, j->toks, 0);
+	assert(j);
+}
+
+static void remove_one(void)
+{
+	struct json *j = json_parse(tmpctx, "['invoice']");
+	json_tok_remove(&j->toks, j->toks + 1, 1);
+	assert(j);
+}
+
+static void remove_first(void)
+{
+	struct json *j = json_parse(tmpctx, "['one', 'two', 'three']");
+	assert(j);
+	json_tok_remove(&j->toks, j->toks + 1, 1);
+	assert(j->toks);
+
+	test_toks(j, "two", "three", NULL);
+	assert(tal_count(j->toks) == 3);
+
+	j = json_parse(tmpctx, "{'1':'one', '2':'two', '3':'three'}");
+	assert(j);
+
+	json_tok_remove(&j->toks, j->toks + 1, 1);
+	assert(j);
+	test_toks(j, "2", "two", "3", "three", NULL);
+	assert(tal_count(j->toks) == 5);
+
+	j = json_parse(tmpctx, "{'1':'one', '2':'two', '3':'three'}");
+	json_tok_remove(&j->toks, j->toks + 1, 1);
+	assert(j);
+	test_toks(j, "2", "two", "3", "three",  NULL);
+	assert(tal_count(j->toks) == 5);
+
+}
+
+static void remove_last(void)
+{
+	struct json *j = json_parse(tmpctx, "['one', 'two', 'three']");
+	json_tok_remove(&j->toks, j->toks + 3, 1);
+	test_toks(j, "one", "two", NULL);
+	assert(tal_count(j->toks) == 3);
+
+	j = json_parse(tmpctx, "{'1':'one', '2':'two', '3':'three'}");
+	json_tok_remove(&j->toks, j->toks + 5, 1);
+	assert(j);
+	test_toks(j, "1", "one", "2", "two", NULL);
+	assert(tal_count(j->toks) == 5);
+}
+
+static void remove_multiple(void)
+{
+	struct json *j = json_parse(tmpctx, "['a', 'b', 'c', 'd', 'e']");
+	json_tok_remove(&j->toks, j->toks + 1, 2);
+	test_toks(j, "c", "d", "e", NULL);
+
+	j = json_parse(tmpctx, "['a', 'b', 'c', 'd', 'e']");
+	json_tok_remove(&j->toks, j->toks + 2, 2);
+	test_toks(j, "a", "d", "e", NULL);
+
+	j = json_parse(tmpctx, "{'1':'one', '2':'two', '3':'three', '4':'four'}");
+	json_tok_remove(&j->toks, j->toks + 3, 2);
+	assert(j);
+	test_toks(j, "1", "one", "4", "four", NULL);
+	assert(tal_count(j->toks) == 5);
+}
+
+static void remove_all(void)
+{
+	struct json *j = json_parse(tmpctx, "['a', 'b', 'c', 'd', 'e']");
+	json_tok_remove(&j->toks, j->toks + 1, 5);
+	assert(tal_count(j->toks) == 1);
+
+	j = json_parse(tmpctx, "{'1':'one', '2':'two', '3':'three', '4':'four'}");
+	json_tok_remove(&j->toks, j->toks + 1, 4);
+	assert(tal_count(j->toks) == 1);
+}
+
+static void remove_complex(void)
+{
+	struct json *j = json_parse(tmpctx,
+	"{'1':'one', '2':'two',"
+		"'3': { '3.1': 'a', '3.2':'b', '3.3':'c' }, "
+		"'4': { '4.1': 'a', '4.2':'b', '4.3':'c' }, "
+	"'5':'five'}");
+
+	json_tok_remove(&j->toks, j->toks + 5, 2);
+	test_toks(j, "1", "one", "2", "two", "5", "five", NULL);
+}
+
+int main(void)
+{
+	setup_locale();
+	setup_tmpctx();
+
+	sanity();
+	remove_one();
+	remove_first();
+	remove_last();
+	remove_multiple();
+	remove_all();
+	remove_complex();
+
+	tal_free(tmpctx);
+	printf("run-json_remove ok\n");
+}
diff --git a/lightningd/test/run-param.c b/lightningd/test/run-param.c
index d7f652222..c46c64c68 100644
--- a/lightningd/test/run-param.c
+++ b/lightningd/test/run-param.c
@@ -561,6 +561,7 @@ int main(void)
 	setup_tmpctx();
 	cmd = tal(tmpctx, struct command);
 	cmd->mode = CMD_NORMAL;
+	cmd->allow_unused = false;
 	fail_msg = tal_arr(cmd, char, 10000);
 
 	zero_params();