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next-axiom

Send WebVitals from your Next.js project to Axiom.

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next-axiom

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Axiom unlocks observability at any scale.

  • Ingest with ease, store without limits: Axiom’s next-generation datastore enables ingesting petabytes of data with ultimate efficiency. Ship logs from Kubernetes, AWS, Azure, Google Cloud, DigitalOcean, Nomad, and others.
  • Query everything, all the time: Whether DevOps, SecOps, or EverythingOps, query all your data no matter its age. No provisioning, no moving data from cold/archive to “hot”, and no worrying about slow queries. All your data, all. the. time.
  • Powerful dashboards, for continuous observability: Build dashboards to collect related queries and present information that’s quick and easy to digest for you and your team. Dashboards can be kept private or shared with others, and are the perfect way to bring together data from different sources.

For more information, check out the official documentation.

Introduction

This library allows you to send Web Vitals as well as structured logs from your Next.js application to Axiom.

Using the Pages Router? Use version 0.* which continues to receive security patches. Here's the README for 0.x.

Prerequisites

Install next-axiom

  • In your terminal, go to the root folder of your Next.js app, and then run npm install --save next-axiom to install the latest version of next-axiom.
  • Add the following environment variables to your Next.js app. For more information, see the Vercel documentation.
    • NEXT_PUBLIC_AXIOM_DATASET is the name of the Axiom dataset where you want to send data.
    • NEXT_PUBLIC_AXIOM_TOKEN is the Axiom API token you have generated.
  • In the next.config.ts file, wrap your Next.js configuration in withAxiom:
const { withAxiom } = require('next-axiom');

module.exports = withAxiom({
  // Your existing configuration.
});

Capture traffic requests

To capture traffic requests, create a middleware.ts file in the root folder of your Next.js app:

import { Logger } from 'next-axiom'
import { NextResponse } from 'next/server'
import type { NextFetchEvent, NextRequest } from 'next/server'

export async function middleware(request: NextRequest, event: NextFetchEvent) {
    const logger = new Logger({ source: 'middleware' }); // traffic, request
    logger.middleware(request)

    event.waitUntil(logger.flush())
    return NextResponse.next()

// For more information, see Matching Paths below
export const config = {
}

logger.middleware accepts a configuration object as the second argument. This object can contain the following properties:

  • logRequestDetails: Accepts a boolean or an array of keys. If you pass true, it will add all the request details to the log (method, URL, headers, etc.). If you pass an array of strings, it will only add the specified keys. See Request and NextRequest for documentation on the available keys. If logRequestDetails is enabled the function will return a Promise that needs to be awaited.
export async function middleware(request: NextRequest, event: NextFetchEvent) {
  const logger = new Logger({ source: "middleware" });
  await logger.middleware(request, { logRequestDetails: ["body", "nextUrl"] });

  event.waitUntil(logger.flush());
  return NextResponse.next();
}

Web Vitals

To send Web Vitals to Axiom, add the AxiomWebVitals component from next-axiom to the app/layout.tsx file:

import { AxiomWebVitals } from 'next-axiom';

export default function RootLayout() {
  return (
    <html>
      ...
      <AxiomWebVitals />
      <div>...</div>
    </html>
  );
}

Web Vitals are only sent from production deployments.

Logs

Send logs to Axiom from different parts of your app. Each log function call takes a message and an optional fields object.

log.debug('Login attempt', { user: 'j_doe', status: 'success' }); // Results in {"message": "Login attempt", "fields": {"user": "j_doe", "status": "success"}}
log.info('Payment completed', { userID: '123', amount: '25USD' });
log.warn('API rate limit exceeded', { endpoint: '/users/1', rateLimitRemaining: 0 });
log.error('System Error', { code: '500', message: 'Internal server error' });

Route handlers

Wrap your route handlers in withAxiom to add a logger to your request and log exceptions automatically:

import { withAxiom, AxiomRequest } from 'next-axiom';

export const GET = withAxiom((req: AxiomRequest) => {
  req.log.info('Login function called');

  // You can create intermediate loggers
  const log = req.log.with({ scope: 'user' });
  log.info('User logged in', { userId: 42 });

  return NextResponse.json({ hello: 'world' });
});

Route handlers accept a configuration object as the second argument. This object can contain the following properties:

  • logRequestDetails: Accepts a boolean or an array of keys. If you pass true, it will add all the request details to the log (method, URL, headers, etc.). If you pass an array of strings, it will only add the specified keys. See Request and NextRequest for documentation on the available keys.

  • NotFoundLogLevel: Override the log level for NOT_FOUND errors. Defaults to warn.

  • RedirectLogLevel: Override the log level for NEXT_REDIRECT errors. Defaults to info.

Config example:

export const GET = withAxiom(
  async () => {
    return new Response("Hello World!");
  },
  { 
    logRequestDetails: ['body', 'nextUrl'], // { logRequestDetails: true } is also valid
    NotFoundLogLevel: 'error',
    RedirectLogLevel: 'debug',
  }
);

Client components

To send logs from client components, add useLogger from next-axiom to your component:

'use client';
import { useLogger } from 'next-axiom';

export default function ClientComponent() {
  const log = useLogger();
  log.debug('User logged in', { userId: 42 });
  return <h1>Logged in</h1>;
}

Server components

To send logs from server components, add Logger from next-axiom to your component, and call flush before returning:

import { Logger } from 'next-axiom';

export default async function ServerComponent() {
  const log = new Logger();
  log.info('User logged in', { userId: 42 });

  // ...

  await log.flush();
  return <h1>Logged in</h1>;
}

Log levels

The log level defines the lowest level of logs sent to Axiom. Choose one of the following levels (from lowest to highest):

  • debug is the default setting. It means that you send all logs to Axiom.
  • info
  • warn
  • error means that you only send the highest-level logs to Axiom.
  • off means that you don't send any logs to Axiom.

For example, to send all logs except for debug logs to Axiom:

export NEXT_PUBLIC_AXIOM_LOG_LEVEL=info

Capture errors

To capture routing errors, use the error handling mechanism of Next.js:

  • Go to the app folder.
  • Create an error.tsx file.
  • Inside your component function, add useLogger from next-axiom to send the error to Axiom. For example:
"use client";

import { useLogger, LogLevel } from "next-axiom";
import { usePathname } from "next/navigation";

export default function ErrorPage({
  error,
}: {
  error: Error & { digest?: string };
}) {
  const pathname = usePathname()
  const log = useLogger({ source: "error.tsx" });
  let status =  error.message == 'Invalid URL' ? 404 : 500;

  log.logHttpRequest(
    LogLevel.error,
    error.message,
    {
      host: window.location.href,
      path: pathname,
      statusCode: status,
    },
    {
      error: error.name,
      cause: error.cause,
      stack: error.stack,
      digest: error.digest,
    },
  );

  return (
    <div className="p-8">
      Ops! An Error has occurred:{" "}
      <p className="text-red-400 px-8 py-2 text-lg">`{error.message}`</p>
      <div className="w-1/3 mt-8">
        <NavTable />
      </div>
    </div>
  );
}

Upgrade to the App Router

next-axiom switched to support the App Router starting with version 1.0. If you are upgrading a Pages Router app with next-axiom v0.x to the App Router, you will need to make the following changes:

  • Upgrade next-axiom to version 1.0.0 or higher
  • Make sure that exported variables has NEXT_PUBLIC_ prefix, e.g: NEXT_PUBLIC_AXIOM_TOKEN
  • Use useLogger hook in client components instead of log prop
  • For server side components, you will need to create an instance of Logger and flush the logs before component returns.
  • For web-vitals, remove reportWebVitals() and instead add the AxiomWebVitals component to your layout.

FAQ

How can I send logs from Vercel preview deployments?

The Axiom Vercel integration sets up an environment variable called NEXT_PUBLIC_AXIOM_INGEST_ENDPOINT, which by default is only enabled for the production environment. To send logs from preview deployments, go to your site settings in Vercel and enable preview deployments for that environment variable.

How can I extend the logger?

You can use log.with to create an intermediate logger, for example:

const logger = userLogger().with({ userId: 42 });
logger.info('Hi'); // will ingest { ..., "message": "Hi", "fields" { "userId": 42 }}

License

Distributed under the MIT License.

Keywords

web-vitals
axiom
observability
performance
nextjs

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Package last updated on 13 Jul 2025

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