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Bugfender SDK for Svelte

info

A Svelte Sample app is available at Github Bugfender Svelte

Bugfender is a game-changing platform that logs every detail your users experience and feeds the data directly to an easy-to-use web console. Bugfender SDK is multi-platform and available for mobile and web apps, so you can use the same tool for all your apps.

Specifically for Svelte developers, Bugfender offers powerful capabilities to remotely monitor and debug any log or error. You can easily reproduce and fix issues using our detailed log viewer and the stack trace of exceptions.

If you don't have a Bugfender account yet, go to Bugfender Signup and come back here.

Install​

The SDK captures data at the runtime from your Svelte application. You can easily install it as an NPM module.

npm install @bugfender/sdk

In case you are using yarn for dependency management, please use

yarn add @bugfender/sdk

Configure​

Configuring the Bugfender SDK for your Svelte application is super easy!

Open the App.svelte file and import the Bugfender SDK along with other imports required by your app inside the script tag.

<script>
    import { Bugfender } from '@bugfender/sdk';

  // --- other existing imports ---
</script>

Then initialize the BugFender service by calling the init method. We pass the API key to this method. To do this, place the following code after the imports.

Bugfender.init({
  appKey: 'YOUR_APP_KEY_HERE'
  // apiURL: 'https://api.bugfender.com/', //Usually not required, should be used for on-premises or custom data centers
  // baseURL: 'https://dashboard.bugfender.com',  //Usually not required, should be used for on-premises or custom data centers
  // overrideConsoleMethods: true,
  // printToConsole: true,
  // registerErrorHandler: true,
  // version: '',
  // build: '',
});
note

Remember to change YOUR_APP_KEY_HERE with the app key of your app. You can get an app key by signing up to Bugfender. For all the available options see our reference.

Now you can start adding logs of different levels (info, warn, error, etc) in your application code.

Usage​

Send logs​

After the successful installation and configuration, you can now use our APIs in your JavaScript files.

Bugfender.log('This is a log');

Similarly, the SDK provides other methods to send logs to the server:

Bugfender.trace()
Bugfender.info()
Bugfender.log()
Bugfender.warn()
Bugfender.error()
Bugfender.fatal()

The signature of these methods is the same as the window.console equivalents.

Bugfender also accepts string substitutions like the console object does:

for (var i=0; i<5; i++) {
  Bugfender.log("Hello, %s. You've called me %d times.", "Bob", i+1);
}

For more information, check out the MDN docs on console.

Capturing console logs​

Probably you might want to get all you app logs in your log viewer, to do this, when you init Bugfender you can enable the console override. For this there’s the overrideConsoleMethods option you can enable/enable. By default the SDK will capture window.console calls.

Device associated data​

Once your application is running on several devices, it will be useful to know which device belongs to whom. You can associate information to a device as if it were a dictionary:

Bugfender.setDeviceKey('key', 'value');
Bugfender.removeDeviceKey('key');

This will later on let you search this device by “key” in the Bugfender Dashboard and you can use any of the associated data to filter our your device list.

Send issues​

Bugfender allows you to send issues to the server. An issue is similar to an exception but they are showed in the issues section and you can send issues any time from the app, even if the device is not enabled in the system. Issues are useful to keep track of important errors that you can detect in your code.

Bugfender.sendIssue('Issue title', 'Description of the issue');

Issues are displayed in a separate section of the Dashboard. When you send an issue, all logs in cache for the current session are displayed in the Dashboard, even if the device is not enabled for sending logs.

Collect user feedback​

Getting feedback from the final users is one of the most important things for an app developer. Good user feedback allows you to detect errors in your app and helps you to understand better your product.

Sending User Feedback automatically sends all cached logs for the current session, even if the device is not enabled for sending logs.

Built-in feedback modal​

You can send user feedback with our ready-made UI like this:

Bugfender.getUserFeedback().then((result) => {
     if (result.isSent) {
         // User sent the feedback
         // `result.feedbackURL` contains the Bugfender feedback URL
     } else {
         // User closed the modal without sending the feedback
     }
 });

And you will get something like this:

This method accepts an options object which allows to customise the modal strings. We also provide CSS variables to customise the styling (see below).

--bf-backdrop-bg: rgba(0, 0, 0, .5);
--bf-border-radius: 4px;
--bf-color: #222;
--bf-font-heading: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
--bf-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
--bf-input-border: 1px solid #ccc;
--bf-modal-shadow: 0px 4px 12px 0px rgba(0, 0, 0, 0.25);
--bf-placeholder-color: #757575;
--bf-submit-bg: #ff5060;
--bf-submit-color: #fff;
--bf-submit-shadow: 0 2px 0 0 #a93e48;
--bf-z-index: 9999;

Send feedback using your UI​

You can send user feedback directly if you got the feedback with your own view controller. To send it, you should do like this:

Bugfender.sendUserFeedback('Love the App!', 'You are doing a great job with it.')

Advanced Usage​

Send logs with tags​

Bugfender has a more advanced logging system than console.log() which allows you to add tags, specify the file name, line name or function name.

For example, adding a tag will allow you find and filter logs easily in the Bugfender log viewer.

Bugfender.sendLog({ tag: 'tag1', text: 'this is my log' });

Please note in this case the function is sendLog() and the passed parameter is an ILogEntry. All of the fields in the object are optional, if you do not fill them, they will be automatically populated by Bugfender.

Using LogLevel enum​

The way you access the LogLevel enum depends on how you're consuming the Bugfender SDK.

NPM package, ES6 import:

import { LogLevel } from '@bugfender/sdk';

NPM package, CommonJS require:

const LogLevel = require('@bugfender/sdk').LogLevel;

Browser <script> tag:

Bugfender.LogLevel

Disable UI events logging​

Bugfender logs some UI events by default. This includes: clicks, field focus/blur, field keypresses with the resulting value (except for password fields) and form submissions. To disable this behaviour set logUIEvents option to false on Bugfender initialization.

Ignore keypress value for sensitive fields​

Bugfender already ignores password fields from keypress logging, but if you need to ignore a sensitive field you can use the data-bf-ignore-keypress attribute. Note that this can be applied to a single field or a group of fields. If you want to disable this behavior for the whole page add the attribute to the html or body element.

<!-- Ignore a single field -->
<input placeholder="Sensitive field…" data-bf-ignore-keypress>

<!-- Ignore a group of fields. Note that all children of `form` are ignored. -->
<form data-bf-ignore-keypress>
    <input placeholder="Superhero name">
    <input placeholder="Superhero HQ address">
</form>

<!-- Ignore on all the fields -->
<body data-bf-ignore-keypress>
    ...
</body>

Note: that what's being ignored is the value of the field. The keypress event will still be registered.

Send a Crash manually​

You can also manually send crash information. Usually you do not want to use this, enable automated crash reporting instead using the registerErrorHandler option. This will force all logs in the current session to be sent, even if log sending is disabled.

Bugfender.sendCrash('Crash Title', `Ops, the app crashed, better check what's wrong.`);

API Reference​

For a complete API Reference you can visit: https://js.bugfender.com.

Content Security Policy​

If you have CSP enabled you'll need to grant access to api.bugfender.com for the Bugfender API.

Content-Security-Policy: default-src api.bugfender.com;

For more information on how to configure CSP please refer to the MDN documentation.