IPRout

Browser Integration and CORS

Direct browser requests expose the API credential to the browser and should be used only when that risk is intentionally accepted. Starter and Pro can restrict keys to exact allowed origins, but CORS is an additional browser boundary rather than secret storage. Server-side lookup remains safer for confidential credentials and controlled enrichment.

Last updated September 12, 2026

What can users see in browser code?

Any key delivered to JavaScript can be inspected through source, developer tools, extensions, or intercepted application state. Obfuscation does not make it secret. Use a dedicated restricted key, monitor its consumption, and choose a Pro cap when direct browser access is unavoidable.

How are origins configured?

An origin includes scheme, hostname, and port. List development, preview, and production origins explicitly within the plan allowance. Settings are immutable for the credential, so create and rotate a replacement when hosting or origin requirements change.

What is the safer architecture?

Call IPRout from an authenticated server endpoint, validate what the browser may request, and return only necessary fields. This keeps the upstream secret private and lets the application enforce user, tenant, rate, logging, and retention policies that CORS alone cannot provide.

How should intentional direct-browser lookup be implemented?

Use a dedicated paid-plan key with exact origins only when direct browser access is a deliberate tradeoff. Request the narrowest product data and avoid reusing the credential elsewhere. Keep this responsibility close to the IPRout client so the behavior documented in Browser Integration and CORS remains consistent across web requests, workers, and scheduled jobs.

How should intentional direct-browser lookup be verified?

Inspect the production bundle and developer tools to acknowledge that the key is visible, then test allowed and denied origins plus cap behavior from a real browser. Automate the stable cases and reserve live checks for controlled environments so verification is repeatable without consuming unnecessary production allowance.

How should intentional direct-browser lookup be operated?

Monitor the browser key independently, size a Pro cap to expected public traffic, and keep a replacement procedure ready. Rejected origins should not consume lookup allowance. Write down the owner and expected behavior so an alert or product change can be handled without reconstructing the original integration decisions.

Where does intentional direct-browser lookup stop?

CORS limits which web origins can read a response; it is not cryptographic secret storage and does not govern ordinary non-browser clients. Sensitive workflows should proxy through trusted server code. Treat that limit as part of the feature contract and direct callers to the related guide when they need a different guarantee or control.

What belongs in the release review for intentional direct-browser lookup?

Review the deployed implementation of Browser Integration and CORS, not only a local sample. Confirm the intended endpoint, credential source, timeout, response model, and fallback from the environment that will carry real traffic. Use the verification cases above as release evidence, inspect generated browser assets and logs for secret exposure, and make sure dashboards identify the workload without storing raw credentials or unnecessary IP data. Record the configuration owner and rollback action before enabling the feature broadly.

When should intentional direct-browser lookup be revisited?

Revisit intentional direct-browser lookup when traffic volume, plan capacity, application ownership, deployment regions, browser origins, data retention, or the product consequence of a lookup changes. Compare the current implementation with the documented operating boundary rather than assuming the original decision still fits. Update tests and internal runbooks together, then verify the public API contract and related IPRout guides before rolling the change across every service that shares the client or account.

External references

Continue with the standards and official documentation most relevant to this guide.

Continue building with IPRout

Test the API, browse runnable examples, or return to the documentation directory.