LogNest — Local Log Analysis for Backend Developers

 — How it works —

  LogNest has two parts: a desktop app that runs the dashboard and log storage,

  and a client library for your backend that forwards logs over localhost.

  Java / Spring Boot: add one Maven dependency and set your service name in

  application.properties. That's it — zero code changes. Every log.info,

  log.warn, and log.error call auto-forwards, including MDC values like

  trace IDs and request IDs.

  Node.js: two lines of code, or use the zero-change option that patches

  console.log so existing code forwards without modification. ESM and CommonJS

  both supported, no dependencies.

  Python: one line — lognest.setup(service="my-service"). Works with Django,

  Flask, FastAPI, and the standard logging module. Stdlib only, Python 3.7+.

  — Why local-first matters —

  Sending debug logs to a third-party SaaS is a liability most developers

  don't think about until it's too late. Debug logs regularly contain fragments

  of real data — request bodies, validation errors, stack traces with user input,

  internal IDs. If you're working on anything that touches GDPR, HIPAA, PCI,

  or enterprise security policy, forwarding those logs off-machine creates

  compliance exposure.

  LogNest keeps everything on localhost. Nothing is transmitted, nothing is

  stored off-device. You get the full power of a modern log dashboard without

  any of the data risk.

  It also works 100% offline. No telemetry, no license server ping,

  no cloud dependency of any kind.

  — What you get —

  Real-time log stream with color-coded levels, service filters, and instant

  full-text search. Log detail panel with metadata. Saved filter presets.

  CSV and JSON export. Error rate charts and alert rules. Session clear mode

  that wipes all logs on startup — useful for shared machines or

  privacy-sensitive workflows.

  Free tier is active out of the box: 50,000 logs and 7-day retention,

  which covers most local development workflows. Paid tiers unlock higher

  limits, charts, alerts, and export.

  One-time purchase. No subscription. Mac and Windows.