{
"url": "https://example.com/",
"finalUrl": "https://example.com/",
"statusCode": 200,
"enforced": false,
"verdict": "no_csp",
"scriptProtection": "none",
"grade": "F",
"score": 40,
"summary": {
"errors": 1,
"warnings": 0,
"infos": 0
},
"policies": [],
"issues": [
{
"severity": "error",
"code": "csp_missing",
"message": "No Content-Security-Policy header and no <meta http-equiv=\"Content-Security-Policy\"> tag was found, so the browser applies no CSP and nothing limits where scripts load from. Basis: W3C Content Security Policy Level 3, \"Content-Security-Policy header\".",
"docs": "https://www.w3.org/TR/CSP3/#csp-header"
}
],
"metaPolicies": 0,
"cached": false,
"checkedAt": "2026-10-21T15:38:39.223Z",
"note": "Evaluates the Content Security Policy that the page declares in its HTTP response headers (Content-Security-Policy and Content-Security-Policy-Report-Only) and in <meta http-equiv> tags in the HTML head, using the W3C Content Security Policy Level 3 rules. The page is fetched with this API's own user agent, so a site that serves different headers to other clients can look different to real browsers. Policies set by scripts at runtime are not seen. Findings are static analysis of the policy text: they do not prove that a page is exploitable or safe, and a clean report is not a security guarantee."
}
curl --location --request GET 'https://zylalabs.com/api/14379/csp+evaluator+api/36041/evaluate+the+content+security+policy+of+a+website?url=https://example.com' --header 'Authorization: Bearer YOUR_API_KEY'
After signing up, every developer is assigned a personal API access key, a unique combination of letters and digits provided to access to our API endpoint. To authenticate with the CSP Evaluator API simply include your bearer token in the Authorization header.
| Header | Description |
|---|---|
Authorization
|
Required
Should be Bearer access_key. See "Your API Access Key" above when you are subscribed.
|
No long-term commitment. Upgrade, downgrade, or cancel anytime. Free Trial includes up to 50 requests.
Finds the weak points in a website Content Security Policy that undermine script-injection protection. Returns one graded JSON report with a verdict, grade and stable issue codes.
The Content Security Policy of a web page, read from the response headers and from meta tags in the HTML head. It returns a verdict, a script protection level, a grade, the parsed policies and coded issues, each linked to the W3C CSP Level 3 section it is based on.
No. It is a static assessment of the policy text. A clean report is not a security guarantee, and policies that scripts add at runtime are not seen.
Strict means scripts are guarded by nonces or hashes, allowlist means only a host allowlist guards them, none means no effective script protection and unknown means it could not be determined, for example because the page returned an error status.
Yes. A bare domain such as example.com is treated as https. Parameter aliases such as u, link, target and site are accepted as well.
Yes. Results are cached for 15 minutes. Add the fresh parameter set to 1 to bypass the cache, for example right after you change your policy.
To obtain your API key, first sign in to your account and navigate to the API you want to use. From the API's Pricing section, choose a plan and complete the subscription process. Once subscribed, return to the API page and you will see your API Access Key displayed at the top of the documentation page. You can use this key to authenticate your requests.
You can’t switch APIs during the free trial. If you subscribe to a different API, your trial will end and the new subscription will start as a paid plan.
The free trial lasts for 7 days and allows you to make up to 50 API requests.
No, the free trial is available only once, so we recommend using it on the API that interests you the most. Most of our APIs offer a free trial, but some may not include this option.
Yes. If the API offers a free trial, you will see a "Free 7-Day Trial" option in its Pricing section. The trial lasts for 7 days and allows up to 50 API requests, enabling you to evaluate the API before subscribing to a paid plan.
Zyla API Hub is like a big store for APIs, where you can find thousands of them all in one place. We also offer dedicated support and real-time monitoring of all APIs. Once you sign up, you can pick and choose which APIs you want to use. Just remember, each API needs its own subscription. But if you subscribe to multiple ones, you'll use the same key for all of them, making things easier for you.
You can monitor your API usage through the response headers included with every request:
x-zyla-api-calls-monthly-used: Shows the total number of API requests you have used during the current billing period.
x-zyla-api-calls-monthly-remaining: Shows the number of API requests you have remaining for the current billing period.
Yes, you can cancel your subscription at any time. Simply go to the Pricing section of the API you're subscribed to and click the "Unsubscribe" button.
Please note that upgrades, downgrades, and cancellations take effect immediately. Once your subscription is canceled, access to the service will end immediately, regardless of any remaining API calls in your quota.
Please have a look at our Refund Policy: https://zylalabs.com/terms#refund