ProxyCeptor vs Postman Interceptor: Modify Traffic vs Capture Traffic
Postman Interceptor is a companion browser extension that captures requests and syncs cookies from your browser into Postman, so you can replay them as API requests. ProxyCeptor is an interceptor that changes live traffic in the browser: it mocks responses, deep-merges JSON, injects headers, adds delays and redirects URLs, so your running app sees different data.
Recommendation: Use Postman Interceptor if your goal is to collect real browser requests into Postman collections. Use ProxyCeptor if your goal is to change what your app receives while you develop or test it.
Side-by-Side Capability Matrix
| Feature | ProxyCeptor | Postman Interceptor |
|---|---|---|
| Capture browser requests | Yes (Network tab, HAR export) | Yes (into Postman history/collections) |
| Sync browser cookies to an API client | No | Yes |
| Mock responses in the running app | Yes | No |
| Partial JSON edits (deep merge) | Yes | No |
| Latency and error simulation | Yes | No |
| Redirect or rewrite URLs | Yes | No |
| Requires desktop app | No | Postman app for full workflow |
| Built-in API client | Commander (browser-based) | Postman |
Why Engineering Teams Choose ProxyCeptor over Postman Interceptor
Changes what the app sees
Mocks and modifications apply to the real running UI, which is what front-end and QA work needs.
Scenario rules for the team
Named rules in a cloud workspace let anyone reproduce the same API state.
When Postman Interceptor is the better choice
- Your team lives in Postman and you want to turn browser traffic into collections and tests.
- You need authenticated cookies from the browser inside an API client.
Frequently Asked Questions
Can Postman Interceptor modify responses?
No. It captures requests and cookies. Response mocking in Postman is done through Postman mock servers, which requires pointing your app at a different URL.
Can I use both?
Yes. Capture with Postman Interceptor for API tests, and use ProxyCeptor to change live responses while you work in the app.
Related comparisons and guides
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