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How To ▶ Content Security Policy (CSP)

Content Security Policy (CSP)

Content Security Policy (CSP) is an optional security feature built into modern browsers. It lets you set limits on the browser, such as the locations where it can load scripts from, by sending a Content-Security-Policy response header.

If you use Content Security Policy on your site, the following restrictions affect your use of JSNLog:

  1. unsafe-eval - jsnlog.js does not use eval, or versions of setTimeout and setInterval that take strings. So there is no need to use unsafe-eval to make your use of JSNLog compliant with CSP.
  2. unsafe-inline - jsnlog.js itself is a single file library that doesn't load any other JavaScript. It can be loaded into your page in a variety of ways.

    If you use ASP.NET MVC, one of these ways is via the Configure method. This allows you to configure JSNLog in your ASP.NET web.config file. It reads the configuration and translates this to inline JavaScript, which then does the actual configuration.

    This means that JSNLog is CSP compliant, except if you use the Configure method.

Documentation Menu

  1. Installation
  2. Getting Started
  3. Configuration
    1. On the client
    2. On the server
      1. JSNLog
      2. Logger
      3. AjaxAppender
      4. ConsoleAppender
  4. How To
    1. Adding request headers
    2. AJAX error handling
    3. Angular 2+ logging to the server
    4. AngularJs Error Handling
    5. Console log
    6. Content Security Policy (CSP)
    7. Setting the url to send logs to
    8. Logging cyclic references
    9. Demos and sample code
    10. Lost connection handling
    11. JavaScript Error Handling
    12. Javascript Try Catch
    13. Loading jsnlog.js
      1. AMD
      2. Browserify
      3. Bundles
      4. Free CDN
      5. CommonJS
      6. ES6
      7. Script tag
      8. SystemJS
    14. Log Message Batching
    15. Log Message Format
    16. Numeric Severities
    17. Obfuscated Script Errors
    18. Using Request Ids
    19. Structured JavaScript Logging
  5. jsnlogjs.js
    1. AjaxAppender Object
      1. sendBatch Method
      2. setOptions Method
    2. __jsnlog_configure function
    3. ConsoleAppender Object
      1. sendBatch Method
      2. setOptions Method
    4. Exception Object
    5. JL Namespace and Method
      1. createAjaxAppender Method
      2. createConsoleAppender Method
      3. getAllLevel Method
      4. getDebugLevel Method
      5. getErrorLevel Method
      6. getFatalLevel Method
      7. getInfoLevel Method
      8. getOffLevel Method
      9. getTraceLevel Method
      10. getWarnLevel Method
      11. JL Method
      12. setOptions Method
    6. Logger Object
      1. debug Method
      2. error Method
      3. fatal Method
      4. fatalException Method
      5. info Method
      6. log Method
      7. setOptions Method
      8. trace Method
      9. warn Method
  6. JavascriptLogging Class
    1. Configure Method
    2. OnLogging Event
    3. RequestId Method
    4. SetJsnlogConfiguration Method
  7. Tag Helpers
    1. jl-javascript-logger-definitions