Pre-request & Test Scripts (vx API)

Run JavaScript before and after every request with the vx API — assertions, variable manipulation, and Postman-compatible script conversion.

Two scripts per request

Pre-request script — runs before the request is sent. Use it to compute signatures, set headers, or seed variables.
Test script — runs after the response. Use it for assertions and to chain dependent requests.

The `vx` object

Call	What it does
`vx.response.json()`	Parse the response body as JSON.
`vx.response.to.have.status(200)`	Chai-style status assertion.
`vx.clusterVariables.set(key, value)`	Save a value into the cluster's variable store.
`vx.clusterVariables.get(key)`	Read a previously-saved variable.
`vx.test(name, fn)`	Define a named test that shows pass/fail in the response panel.
`vx.expect(value)`	Chai-style expect assertion (`.to.equal`, `.to.be.greaterThan`, etc.).

Example: extract a token and chain

// Pre-request: nothing
// Test:
const data = vx.response.json();
vx.test('login succeeds', () => {
    vx.response.to.have.status(200);
    vx.expect(data.token).to.be.a('string');
});
vx.clusterVariables.set('token', data.token);

Postman compatibility

Imported Postman collections work out of the box: pm.environment → vx.clusterVariables, pm.response → vx.response, pm.test → vx.test, pm.expect → vx.expect. Conversion is automatic and reversible.

Editor UX

Full JS tokenizer-based syntax highlight: keywords, API objects (vx, pm, console, JSON, Math, Date), strings, comments, numbers, arrow functions.
Gutter line numbers with synced scrolling between the textarea and highlight layer.
Tab inserts spaces (no focus loss).
console.log() output streams into the script panel.

Sandbox note: Scripts execute in a renderer-level sandbox with access to the cluster's variables, the request, the response, and a small standard-library surface — no Node APIs.