Structured logging to Axiom for Val Town.

Set environment variables in your val:

• AXIOM_TOKEN - API token with ingest permission
• AXIOM_DATASET - Dataset name

import { Hono } from "npm:hono@4";
import {
  type AxiomEnv,
  axiomMiddleware,
} from "https://esm.town/v/kamalnrf/axiom-logger/hono.ts";

const app = new Hono<AxiomEnv>();
app.use(axiomMiddleware());

app.get("/", (c) => {
  c.var.log.info("hello", { userId: 123 });
  return c.json({ ok: true });
});

export default app.fetch;

import { H3 } from "npm:h3@^2";
import { axiomMiddleware } from "https://esm.town/v/kamalnrf/axiom-logger/h3.ts";

const app = new H3();
axiomMiddleware().forEach((m) => app.use(m));

app.get("/", (event) => {
  event.context.log.info("hello", { userId: 123 });
  return { ok: true };
});

export default app.fetch;

import { withLogger } from "https://esm.town/v/kamalnrf/axiom-logger/standalone.ts";

export default withLogger({ valName: "daily-cleanup" }, async (log) => {
  log.info("starting");
  // ... do work
  log.info("done", { processed: 42 });
});

axiomMiddleware({
  dataset: "my-dataset", // override env var
  token: "...", // override env var
  console: "warn", // console output level: "debug" | "info" | "warn" | "error" | "none"
  defaultFields: { env: "prod" },
  onError: (err) => console.error(err),
});

log.debug(message, fields?)
log.info(message, fields?)
log.warn(message, fields?)
log.error(message, fields?)