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Browser SDK troubleshooting

Use this page when the collector does not start, does not collect, or collects less than you expect. Every symptom below comes from an error body, a result code, an event or a console message that the collector produces. Start with the console checks, then find your symptom in the tables.

What it is

Availability: Evaluation access. Availability depends on your plan, role and the modules enabled for your organisation.

The core script fails open. A problem in the collector does not block your page, and most failures show up as a missing event, a reason and code in a result, a noxtica:error event, or an HTTP error on a /client/* call. This page maps those signals to causes. Concepts are on Install and Browser Runtime; the full reference is on the other pages of this section.

Prerequisites

A browser with DevTools (Console and Network).
The page that shows the problem, served from the origin registered for the Site Key.
Your Site Key. It is public. Never post a Server API key (sk_…), a session token or a cookie value in a ticket.
For consent questions, the consent mode of the domain: Backoffice → Integrations & API → Script & Consent → Consent & extensions.

Steps

1. Read the loader state

Run this in the console of the affected page:

({
	version: window.noxtica && window.noxtica.v,                 // loader version, set by the initial core script
	loader: typeof window.NoxticaCollector,                       // 'object' when a core script ran
	client: typeof window.noxticaClient,                          // 'object' when a data-auto-init tag bound
	consent: window.noxticaClient && window.noxticaClient.getConsent(),
	extensions: window.noxticaClient && window.noxticaClient.getExtensionsState(), // 'not-loaded' | 'attached' | 'built-in'
	lastResult: window.noxticaResult,
	lastError: window.noxticaLastError,                           // { source, message, time }
	logLevel: window.NoxticaCollector && window.NoxticaCollector.getLogLevel(),
});

To see more, set the log level to debug with data-log-level="debug" on the tag and reload. The loader is silent by default. See Script attributes and client options.

2. Check the Network tab

Filter by your collector host. A working page shows the core script and POST /client/token with status 200. After consent in a gated mode it also shows the extensions script, engine files and POST /client/submit. An error body from the collector carries a requestId; keep it for support.

Read getConsent(): mode, modeResolved and the four categories. Then call await window.noxticaClient.loadExtensions() and read ok, reason and code. The tables below explain each value.

4. Check the policy

Open the console on a page with the policy in force and look for violations that name a Noxtica host. See Content Security Policy, hosts and first-party relay.

5. Collect what support needs

Send: your Site Key, the page URL without query strings, the loader version (window.noxtica.v), the output of step 1, the failing request with its status and requestId, and the time. Contact your account team or use Contact. Platform incidents are listed on status.noxtica.com.

6. Check the browser

The collector needs WebAssembly and blob: workers for its engines. GPU attestation also needs WebGPU: without it the loader logs WebGPU not available and skips that step. The Web Locks API is optional; a browser without it falls back to a localStorage lock for the cross-tab check. A privacy mode, an extension or a network rule that blocks cross-origin requests, storage, workers or WebAssembly reduces the evidence or stops collection, and the page keeps working.

Headless and automated browsers are scored as bots, and your CDN may challenge them. Do not compare risk scores from headless runs. Test on a lab page, as described in Release checks, testing and versions.

Noxtica does not publish a verified minimum browser version list in this documentation. Test the browsers and privacy modes your own application supports.

Verify it works

After a fix, reload the page with a clean profile and check:

typeof window.noxticaClient is 'object' and window.noxtica.v holds a version.
POST /client/token answers 200.
window.noxticaLastError is undefined.
In a gated mode, getConsent().modeResolved is true; after consent getExtensionsState() is 'attached'.
Exactly one noxtica:collected event fires for the page.

Troubleshooting

The script does not start

Symptom	Cause	Fix
`window.noxticaClient` undefined and no `noxtica:*` events	The tag lacks `data-auto-init` or `data-site-key`, or the `src` file name has neither `noxtica-collector` nor `/noxtica.js`	Add the attributes and keep the file name. A tag without a Site Key is skipped silently.
`window.NoxticaCollector` undefined	The core script did not load: blocked by CSP or a network rule, a `404`, or an integrity failure	Read the failed request in Network and the console. See the CSP page.
Pinned tag blocked with an integrity error	The pin is more than three releases old, or the hash was copied from a document	Copy the tag again from Script & Consent → Snippets, or use the stable tag.
`NX001: already loaded (v…), duplicate tag v… ignored.`	A second core or combined tag on the page	Remove it. The initial tag keeps running and its version is `window.noxtica.v`.
`window.noxtica(...)` does nothing	`window.noxtica` is a plain object without `q`, or the tag lacks `data-auto-init`	Define the stub as a function or array.
`NoxticaCollector: siteKey is required`	`createClient` found no Site Key	Pass `siteKey` or keep `data-site-key` on a collector tag.
A relay or proxy path loads the script but nothing binds	The proxied file name lost `noxtica-collector`	Keep the file name when you proxy the script.

`POST /client/token` fails

Status and body	Cause	Fix
`403` `Origin not allowed`	The request had no `Origin` header, so it did not come from a normal browser page	Test from a real page on the registered origin.
`403` `Origin mismatch`	The page origin differs from the origin registered for the Site Key	Use the key of the exact origin. Staging needs its own domain and key.
`400` `Missing siteKey`	The request body had no Site Key	Check the tag’s `data-site-key` or the `siteKey` option.
`401` `Invalid siteKey`	The Site Key is unknown or inactive	Copy the key again from Backoffice → Domains.
`403` `Tenant suspended` or `Domain disabled`	The account or the domain is not active	Contact your account team.
`429` `Rate limit exceeded`, with `Retry-After`	The tenant and client address hit the token rate limit	Wait for `Retry-After`.
`429` `quota_exceeded` with code `COLLECTOR_REQUESTS_QUOTA_EXCEEDED`	The monthly collector request quota is used up, when quota enforcement is enabled	Check usage in Backoffice and see Usage, quotas and metering.
`413` `Payload too large` or `415` `Content-Type must be application/json`	A custom client or proxy changed the request	Do not rewrite collector requests.

Symptom	Cause	Fix
`noxtica:collected` has `skipped: 'consent_required'`	A gated mode and `deviceId` not granted	Call `setConsent({ deviceId: 'granted' })` after the visitor agrees. Not an error.
`getConsent().mode` is `not_required` on an `api` domain	`modeResolved` is `false`: the saved mode has not arrived	Wait for `noxtica:consent-changed`, or declare `data-consent-mode`.
`setConsent` throws `NoxticaCollector.setConsent requires granted, denied, or { analytics, replay, deviceId, behavioral }`	A boolean or another shape	Pass `'granted'` or `'denied'`.
`setConsent` throws `unknown consent category` or `… must be granted or denied`	A wrong key or value	Use the four category names with the two strings.
Extensions load for visitors who declined	Not required mode with automatic loading, or a legacy script URL	See Consent modes.
Two `noxtica:collected` events with different ids	Loader older than 3.8.1	Update to the current loader; take the id from the server verify call.
`fingerprintId` in the browser differs from the server	The core and the extensions mint different ids	Use the id from `POST /v1/protected-actions/verify`.

Extensions: `loadExtensions()` results

loadExtensions() never rejects. It resolves { ok: true, loaded } or { ok: false, reason, code, … }. A later call retries after a failure.

`reason`	`code`	Cause	Fix
`consent_missing`	`consent_required`	You passed `{ requireConsent: true }` in a gated mode and no category is granted	Grant a category before you call it, or drop the option.
`consent_missing`	`consent_withdrawn`	A queued `loadExtensions` was dropped because the queued consent denies all four categories (loader 3.8.1 and later)	Call `loadExtensions()` after a grant.
`csp_blocked`	`script-src-elem` or `script-src`	An enforced CSP blocked the script	Allow the collector host in that directive.
`integrity_mismatch`	`sha384_mismatch`	A pinned file’s bytes differ from its hash	Copy the pinned tag again.
`network`	`http_<status>`, `fetch_failed`	The file returned an HTTP error or no response	Check the host, the proxy and `connect-src`.
`timeout`	`script_timeout`	No load or error event within 20 seconds	Retry. Check the network path.
`already_loaded`	`script_present`	A `<script>` for the extensions URL is in the page but nothing registered	Remove your own extensions tag, or fix why it did not run.
`unknown`	`build_mismatch`	The extensions come from another build than the core	Load core and extensions from the same collector release.
`unknown`	`invalid_extensions`, `handoff_failed`, `not_registered`	The extensions did not register or take over	Reload; report with the `error` text.
`unknown`	`script_exception`, `script_error`	The browser rejected a file that is reachable, or the script threw	Check the console.
`unknown`	`no_pinned_manifest`, `no_document`, `client_destroyed`	The core has no extensions manifest, there is no document, or the client was destroyed	Use a current core, call from a browser page, create a new client.
`unknown`	`legacy_loader`	The typed wrapper normalised a boolean from a loader older than 3.8.0	Update the loader.

error is human text. Do not parse it. The classification is approximate, because the browser’s error event carries no cause.

Protected actions

Symptom	Cause	Fix
`protect()` resolves `error: 'undeclared_protected_action'`	The name is not declared for the domain	Declare it and reload.
`protect()` rejects with `NoxticaCollector.protect: invalid protected action name`	The name does not match the action grammar	Use lowercase letters, digits, `-` and `_`, starting with a letter.
A form posts without `nox_request_id`	The check exceeded the hold time or the script was blocked	Treat it as no client signal. See Protected actions.
Verify returns `409`, `404` or `422`	Replay, expired or foreign id, or an action or domain mismatch	See the status table on the protected-actions page.

Responses and signatures

Symptom	Cause	Fix
Console warnings `Policy signature verification failed` or `Result signature verification failed`, or errors that mention `Missing policySigned envelope` or `Missing resultSigned envelope`	A response without its signed envelope, or whose signature does not verify. A rule or proxy that rewrites collector responses can cause it.	Stop rewriting collector responses. Keep `signatureMode` at `require`.
`noxtica:error` with source `Auto-init failed`, `Auto-check-once failed`, `Auto-collect failed` or `Deferred page check failed`	The automatic step threw; `message` holds the cause, cut to 200 characters	Read `window.noxticaLastError.message`, then match it to a row above.

Challenges and blocks

Symptom	Cause	Fix
`noxtica:challenge` with `status: 'unsupported'`	The browser cannot run the requested method (`gpu-pow` or `turnstile`)	Informational. The server decides what happens next.
A full-page overlay or a redirect	The server issued a block for the visit; `noxtica:block` reports `overlay` or `redirect`	Review the risk decision in Backoffice. The page cannot dismiss the overlay.

Install and Browser Runtime: install, consent and the check list.
Script attributes and client options: every attribute and option.
Client API, events and the command queue: events and result shapes.
Consent modes, GPC and Google Consent Mode: modes and categories.
Content Security Policy, hosts and first-party relay: policy and relay setup.
SDK Changelog: behaviour that changed between loader releases.

Browser SDK troubleshooting

What it is

Prerequisites

Steps

1. Read the loader state

2. Check the Network tab

3. Check consent and the extensions

4. Check the policy

5. Collect what support needs

6. Check the browser

Verify it works

Troubleshooting

The script does not start

POST /client/token fails

Consent and gated modes

Extensions: loadExtensions() results

Protected actions

Responses and signatures

Challenges and blocks

Related

`POST /client/token` fails

Extensions: `loadExtensions()` results