Skip to main content

rand_string

Purpose​

rand_string creates a random string that would match a particular regular expression. Most regular expression patterns are supported but for edge cases check out the goregen documentation. A new string is generated with every call.

Usage​

"type": "rand_string",
"config": {
    "pattern": "<regular expression>"
}

Example​

Before and After Example​

Configuration​

{
   "type": "rand_string",
   "config": {
       "pattern": "user_[a-z0-9]{10,20}"
   }
}

Example Chains​

req_body() -> json_path(path="userId") -> rand_string(pattern="user_[a-z0-9]{10,20}")

This will extract the userId field from the request body and replace it with a random string matching the pattern.

res_body() -> json_path(path="sessionId") -> rand_string(pattern="[A-Z0-9]{32}")

This will extract the sessionId field from the response body and replace it with a random 32-character alphanumeric string.

http_req_header(header="X-Request-ID") -> rand_string(pattern="req_[0-9]{16}")

This will extract the X-Request-ID header value and replace it with a random request ID pattern.

Before (Original Values)​

  • User ID: user_john_doe_123
  • Session ID: ABC123XYZ789DEF456GHI789JKL012MN
  • Request ID: req_1234567890123456
  • Email: john.doe@example.com

After (Random String Generated)​

  • User ID: user_2mkfazc946jz5o
  • Session ID: K8J3H7F9D2S1A6Q4Z9X8C7V5B3N1M0P2
  • Request ID: req_8765432109876543
  • Email: user847@testdomain92.co