diff -r add8358fc3c3 -r 56eb7da4f3e1 src/json.c
--- a/src/json.c	Sun Dec 15 13:44:08 2024 +0100
+++ b/src/json.c	Sun Dec 15 14:32:39 2024 +0100
@@ -30,6 +30,7 @@
 #include <ctype.h>
 #include <assert.h>
 #include <stdio.h>
+#include <errno.h>
 
 #include "cx/json.h"
 
@@ -38,8 +39,6 @@
  * https://tools.ietf.org/html/rfc8259
  */
 
-#define PARSER_READVALUE_ALLOC 32
-
 static CxJsonValue cx_json_value_nothing = {.type = CX_JSON_NOTHING};
 
 static void token_destroy(CxJsonToken *token) {
@@ -300,10 +299,15 @@
     str.ptr[str.length] = 0;
 
     if (asint) {
+        errno = 0;
         long long v = strtoll(str.ptr, &endptr, 10);
+        if (errno == ERANGE) {
+            return 1;
+        }
         *((int64_t*)value) = (int64_t) v;
     } else {
         // TODO: proper JSON spec number parser
+        // TODO: also return an error when loss of precision is high
         double v = strtod(str.ptr, &endptr);
         *((double*)value) = v;
     }