Scripting

Bruno allows you to write JavaScript code before sending a request (Pre-request) and after receiving a response (Post-response). Use scripts to generate dynamic data, manipulate requests, parse responses, and set variables.

pre-post-script

Pre-request Scripts

Pre-request scripts run before the request is sent. Use them to set headers, generate dynamic values, or modify the request.


// Generate a timestamp
const timestamp = Date.now();
req.setHeader("X-Timestamp", timestamp);
 
// Set a dynamic variable
bru.setVar("requestId", `req-${timestamp}`);
 
// Add authentication token
const token = bru.getEnvVar("authToken");
req.setHeader("Authorization", `Bearer ${token}`);

Post-response Scripts

Post-response scripts run after receiving the response. Use them to validate data, extract values, or set variables for subsequent requests.


// Extract and save data from response
const body = res.getBody();
bru.setVar("userId", body.user.id);
bru.setVar("accessToken", body.token);
 
// Log response details
console.log("Status:", res.getStatus());
console.log("Response time:", res.getResponseTime(), "ms");
 
// Conditional logic based on response
if (res.getStatus() === 200) {
  bru.setEnvVar("lastSuccessTime", new Date().toISOString());
}