Redirect by pattern
Use wildcard rules for simple paths or regex rules for capture groups to precisely target and reroute API calls to your local environment.
Chromium Extension MV3
Route app requests to local backends faster.
Altreurl helps backend developers redirect API calls, forward debugging credentials, and switch rules from the browser without changing application code.
chrome-extension://altreurl/options
Core workflow
Everything needed to debug
request routing in one place.
Set headers manually
Add Authorization and custom headers when local services need explicit context.
Learn credentials
Sync selected headers, bearer tokens, cookies, or storage values from source requests.
Toggle relevant rules
The popup intelligently shows rules only for the current active tab and lets you enable or disable them with a single click, without leaving your context.
Import and export safely
Preview changes, handle conflicts, and redact sensitive credentials automatically before sharing rule configuration files with your team.
Copy diagnostics
Review dynamic rule state and local logs when a setup behaves unexpectedly.
Interface preview
Options page, popup, import,
export, and diagnostics.
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Options add rule manual
Options add rule manual
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Example rule
Point a remote API route
Point a remote API route
at localhost.
Create a source pattern, choose the local target, then decide whether credentials should be manual or synced from the source request. It's that simple.
Privacy stance
Your rules stay in the browser.
Altreurl stores rules, synced values, and diagnostics locally. Exports happen only when you create them.
Read privacy policyrule-configuration.json
// Source pattern to intercept
"source_url": "https://api.example.com/users/*",
"source_url": "https://api.example.com/users/*",
// Where to redirect it
"target_url": "http://localhost:3000/users/*",
"target_url": "http://localhost:3000/users/*",
// Automatically attach cookies/headers
"credential_mode": "sync_from_source",
"credential_mode": "sync_from_source",
// Safe sharing mode
"export_safety": "redact_credentials"
"export_safety": "redact_credentials"