IUDEX Web

Next generation observability. For Node compatible IUDEX, use iudex-node.

Table of contents

• IUDEX Web
  • Table of contents
• Getting Started
  • NextJS
  • Create React App (CRA)
  • Autoinstrument
  • Cloudflare Workers
  • Console
  • Custom logger
  • Tracing functions
• Session Replay
• Slack Alerts
• API reference
  • instrument
    • Options
  • emitOtelLog
    • Options
  • trackAttribute
  • withTracing
    • Example
    • Arguments
  • useTracing
    • Example

Getting Started

Instrumenting your code with IUDEX just takes a few steps.

1. Install dependencies.

npm install iudex-web

2. Follow the below instructions for your frameworks or use autoinstrumentation.
3. Make sure your app has access to the environment variable IUDEX_API_KEY. You can manually add this to instrument as well if you use something like a secrets manager.
4. You should be all set! Go to https://app.iudex.ai/ and enter your API key.
5. Go to https://app.iudex.ai/logs and press Search to view your logs.

NextJS

We will follow the first half of NextJS's OpenTelemetry Guide then make a few changes to introduce IUDEX features and pipe the telemetry to the IUDEX backend which then can be viewed at https://app.iudex.ai/traces.

1. Add experimental.instrumentationHook = true; in your next.config.js
2. Install vercel otel and iudex-web npm install @vercel/otel iudex-web
3. Create a file instrumentation.ts in your project source root (or src if you're using one).
4. Add this to instrumentation.ts

import { registerOTel } from '@vercel/otel';
import { registerOTelOptions } from 'iudex-web';

export function register() {
  const options = registerOTelOptions({
    serviceName: 'YOUR_SERVICE_NAME', // highly encouraged
      publicWriteOnlyIudexApiKey: 'YOUR_PUBLIC_WRITE_ONLY_KEY', // only ever commit your WRITE ONLY key
  });
  registerOTel(options);
}

5. Go to https://app.iudex.ai/traces to view your NextJS traces.

Create React App (CRA)

1. Add this code to the top your entrypoint file (likely index.ts).

import { instrument } from 'iudex-web';
instrument({
  serviceName: 'YOUR_SERVICE_NAME', // highly encouraged
  publicWriteOnlyIudexApiKey: 'YOUR_PUBLIC_WRITE_ONLY_KEY', // only ever commit your WRITE ONLY key
});

console.log('Hello Iudex!'); // Test logging

2. Go to https://app.iudex.ai/logs to view your React app logs.

Autoinstrument

Some functions are automatically tracked:

✅ console ✅ document.onload ✅ fetch ✅ addEventListener ✅ xmlHttpRequest

Add this code to the top your entrypoint file (likely index.ts).

import { instrument } from 'iudex-web';
instrument({
  serviceName: 'YOUR_SERVICE_NAME', // highly encouraged
  publicWriteOnlyIudexApiKey: 'YOUR_PUBLIC_WRITE_ONLY_KEY', // only ever commit your WRITE ONLY key
});

You should be all set! IUDEX will now record logs and trace the entire life cycle for each request.

Go to https://app.iudex.ai/ to start viewing your logs and traces!

For libraries that are not autoinstrumented or if your project uses 'type': 'module', follow the instructions from the table of contents for that specific library.

Cloudflare Workers

Cloudflare workers operate differently than the browser environment due to how the environment is loaded and what global objects are available. Wrap your export handler object with trace to trace all ExportHandler functions.

import { instrument, iudexCloudflare } from 'iudex-web';
instrument({
  serviceName: 'YOUR_SERVICE_NAME', // highly encouraged
  publicWriteOnlyIudexApiKey: 'YOUR_PUBLIC_WRITE_ONLY_KEY', // only ever commit your WRITE ONLY key
});
const { trace, withTracing } = iudexCloudflare;
import { ExportedHandler } from '@cloudflare/workers-types';

export default trace({
  fetch: async (request, env, ctx) => {
    // Your fetch handler goes here
  },
} satisfies ExportedHandler, { name: <your_service_name> });

If you only want to trace specific ExportHandler functions, you can wrap the specific functions with withTracing.

import { instrument, iudexCloudflare } from 'iudex-web';
instrument({
  serviceName: 'YOUR_SERVICE_NAME', // highly encouraged
  publicWriteOnlyIudexApiKey: 'YOUR_PUBLIC_WRITE_ONLY_KEY', // only ever commit your WRITE ONLY key
});
const { trace, withTracing } = iudexCloudflare;
import { ExportedHandler, ExportedHandlerFetchHandler } from '@cloudflare/workers-types';

export default {
  fetch: withTracing(async (request, env, ctx) => {
    // Your fetch handler goes here
  }, { name: <your_service_name> }) satisfies ExportedHandlerFetchHandler,
} satisfies ExportedHandler;

Console

Add this code snippet to the top your entry point file (likely index.ts). Skip this step if you already call instrument on your server.

import { instrument, iudexFastify } from 'iudex-web';
instrument({
  serviceName: 'YOUR_SERVICE_NAME', // highly encouraged
  publicWriteOnlyIudexApiKey: 'YOUR_PUBLIC_WRITE_ONLY_KEY', // only ever commit your WRITE ONLY key
});

Objects with the key ctx will have values in ctx added as attributes to the log. Example:

console.log('hello', { ctx: { userId: '123' } })

will create a log line with the userId attribute set to 123.

Custom logger

Use emitOtelLog to send logs to iudex. You have have called instrument somewhere before emitOtelLog.

import { emitOtelLog } from 'iudex-web';

/**
 * Custom logger example
 */
function createLogger(level: keyof typeof console) {
  return function logger(body: string, attributes: Record<string, any>) {
    console[level](body, attributes);
    emitOtelLog({ level, body, attributes })
  };
}

Tracing functions

Its recommended that you trace functions that are not called extremely frequently and that tends to be an 'entry point' for complex functionality. Examples of this are API routes, service controllers, and database clients. You can trace your function by wrapping it with withTracing.

import { withTracing } from 'iudex-web';

const myFunction = withTracing(async () => {
  console.log('I am traced');
}, { name: 'myFunction', trackArgs: true });

await myFunction();
// console: I am traced

Anytime myFunction is called, it will create a span layer in a trace. trackArgs will also track the arguments for the function. Tracked arguments will be truncated at 5000 characters. If you want to track specific parameters, it is recommended that you log them at the beginning of the function.

Session replay

IUDEX comes with session replay functionality out of the box. Session replay enhances observability by allowing teams to visually reconstruct user interactions, providing crucial context for debugging, performance analysis, and user experience improvement.

Privacy

Privacy is an important consideration when it comes to session replay. By default, IUDEX does not collect any password information and masks PII on the client side. If there are any elements that you want to totally hide/redact from the session replay, you can add the iudex-block CSS class to the elements you want to remove.

<div class="iudex-block">Secrets!</div>

If you want to opt out of session replay entirely, you can disable it in the settings.

instrument({
  serviceName: 'YOUR_SERVICE_NAME',
  publicWriteOnlyIudexApiKey: 'YOUR_PUBLIC_WRITE_ONLY_KEY', 
  settings: {
    disableSessionReplay: true
  }
});

Sampling

By default, IUDEX records all user interactions. For cost or bandwidth considerations, you can set a sample rate to only collect a subset of sessions.

instrument({
  serviceName: 'YOUR_SERVICE_NAME',
  publicWriteOnlyIudexApiKey: 'YOUR_PUBLIC_WRITE_ONLY_KEY', 
  settings: {
    sessionReplaySampleRate: 0.1 // 10% of sessions will be recorded
  }
});

Slack Alerts

You can easily configure Slack alerts on a per-log basis with custom filters an logic by adding it in code.

1. Visit https://app.iudex.ai/logs and click on the Add to Slack button in the top right.

2. Once installed to your workspace, tag your logs with the iudex.slack_channel_id attribute.

// Example using logger
logger.info({ 'iudex.slack_channel_id': 'YOUR_SLACK_CHANNEL_ID' }, 'Hello from Slack!');
// Example using console, you must set { ctx }
console.log('Hello from Slack!', { ctx: { 'iudex.slack_channel_id': 'YOUR_SLACK_CHANNEL_ID' } });

3. Your channel ID can be found by clicking the name of the channel in the top left, then at the bottom of the dialog that pops up.

4. As long as the channel is public or you've invited the IUDEX app, logs will be sent as messages to their tagged channel any time they are logged.

API reference

The iudex package contains the function instrument which automatically attaches to libraries you use and starts sending trace data to iudex. Separately, logs sent via console are also sent. If you use another logger library, find its instrumentation instructions or manually call emitOtelLog to send a log.

instrument

instrument is a function that automatically attaches to libraries you use and starts sending trace data to iudex.

Options

• baseUrl?: string
  • Sets the url to send the trace and log events to.
  • By default this is api.iudex.ai.
• iudexApiKey?: string
  • Sets the api key to send logs.
  • By default this looks for an api key in process.env.IUDEX_API_KEY.
• publicWriteOnlyIudexApiKey?: string
  • Sets the api key to send logs.
  • By default this looks for an api key in process.env.PUBLIC_WRITE_ONLY_IUDEX_API_KEY.
• serviceName?: string
  • Sets the service name for the instrumented logs.
  • While optional, setting this is highly recommended.
• instanceId?: string
  • Sets the id of the runtime instance.
• gitCommit?: string
  • Sets the associated git commit hash for the runtime.
  • This is optional but setting it will help track deployments.
  • By default this parses the commit from the runtime's git instance if available.
• githubUrl?: string
  • Sets the GitHub url so logs with associated filenames can be hyperlinked.
  • Git commit hash is also required for the hyperlinking.
• env?: string
  • Sets the environment of the logs and traces
  • While optional, this is highly recommended because separating development vs production logs denoises both.
  • By default uses process.env.NODE_ENV
• headers?: Record<string, string>
  • Merges into the header object for the fetch that targets the baseUrl.
• settings?: Record<string, boolean>
  • Optionally turn off specified instrumentations by setting it to false.
    • instrumentConsole

emitOtelLog

emitOtelLog is a function that sends a log to iudex.

Options

• level: string
  • Sets level (INFO, WARN, ERROR, FATAL, DEBUG) of the log.
• body: any
  • Sets the content of the log.
• severityNumber?: number
  • Sets the severity of the log as a number.
  • level overwrites this.
• attributes?: Record<string, any>
  • Sets attributes of the log.
    • We highly recommend sending at least userId and requestId.
    • We suggest sending function or file name.
  • Attributes cannot contain nonserializable objects.

trackAttribute

trackAttribute adds an attribute to the current active span.

• key: string
• value: any

withTracing

withTracing instruments a function by wrapping with a trace context. Wrapped functions can be called elsewhere and will always be traced.

Example

import { withTracing } from 'iudex-web';

const myFunction = withTracing(async () => {
  console.log('I am traced');
}, { name: 'myFunction' });

await myFunction();
// console: I am traced

Arguments

• fn: Function
  • Function to trace.
• opts
  • name?: string
    • Name of the trace.
  • trackArgs?: boolean
    • Toggles whether or not to track arguments passed into the function.
    • Tracked args are stored in attributes.arg or attributes.args if there are multiple arguments.
    • Defaults to false.
  • attributes?: Record<string, any>
    • Sets attributes of the trace.
  • setSpan?: (span: Span, ret: ReturnType<Function>) => void
    • Overrides handling the span.

useTracing

useTracing instruments and runs a function with trace context. The arguments are the same as withTracing

Example

import { useTracing } from 'iudex-web';

await useTracing(async () => {
  console.log('I am traced');
}, { name: 'myFunction' });
// console: I am traced