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backend/node_modules/fast-json-stringify/lib/serializer.js

@@ -92,7 +92,9 @@ module.exports = class Serializer {
 
   asString (str) {
     const len = str.length
-    if (len < 42) {
+    if (len === 0) {
+      return '""'
+    } else if (len < 42) {
       // magically escape strings for json
       // relying on their charCodeAt
       // everything below 32 needs JSON.stringify()
@@ -102,8 +104,7 @@ module.exports = class Serializer {
       let result = ''
       let last = -1
       let point = 255
-      // eslint-disable-next-line
-      for (var i = 0; i < len; i++) {
+      for (let i = 0; i < len; i++) {
         point = str.charCodeAt(i)
         if (
           point === 0x22 || // '"'

backend/node_modules/fast-json-stringify/lib/validator.js

@@ -21,8 +21,8 @@ class Validator {
       keyword: 'fjs_type',
       type: 'object',
       errors: false,
-      validate: (type, date) => {
-        return date instanceof Date
+      validate: (_type, data) => {
+        return data && typeof data.toJSON === 'function'
       }
     })
 
@@ -51,8 +51,10 @@ class Validator {
     return this.ajv.validate(schemaRef, data)
   }
 
-  // Ajv does not support js date format. In order to properly validate objects containing a date,
-  // it needs to replace all occurrences of the string date format with a custom keyword fjs_type.
+  // Ajv does not natively support JavaScript objects like Date or other types
+  // that rely on a custom .toJSON() representation. To properly validate schemas
+  // that may contain such objects (e.g. Date, ObjectId, etc.), we replace all
+  // occurrences of the string type with a custom keyword fjs_type
   // (see https://github.com/fastify/fast-json-stringify/pull/441)
   convertSchemaToAjvFormat (schema) {
     if (schema === null) return