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8 Interactive Browser & CLI Utilities

Online Developer Tools & Format Viewers

Paste Nginx or Docker logs, CSV datasets, HTML/SVG artifacts, Markdown + KaTeX specs, JSON payloads, or .env configs to inspect immediately and share a clean Supanote link.

Logs & SRE Observability & Logs

Nginx Access & Error Log Analyzer

Parse Nginx combined access logs and upstream error traces instantly with HTTP status colorizing and secret scanning.

  • ✓ Automatic HTTP 2xx, 3xx, 4xx, and 5xx status code color badges
  • ✓ Severity filtering across ERROR, WARN, INFO, and upstream socket failures
  • ✓ Built-in heuristic detection for leaked Bearer tokens, cookies, and IPs
Containers Observability & Logs

Docker Container & JSON Log Viewer

Inspect Docker Compose stdout/stderr streams, JSON log drivers, ANSI color codes, and multi-line stack traces.

  • ✓ Clean rendering of ANSI escape colors without garbled `[31m` sequences
  • ✓ Automatic stack trace indentation for Node.js, Python, Go, and Java containers
  • ✓ Instant severity filtering (Errors only, Warnings+, or All events)
Data Grid Data & Spreadsheets

Online CSV & TSV Table Viewer

Turn raw comma, tab, or semicolon-delimited text into a fast, sortable spreadsheet table in one paste.

  • ✓ RFC 4180 state-machine parser supporting quoted commas and multi-line cells
  • ✓ Automatic delimiter detection across comma (,), tab (\t), semicolon (;), and pipe (|)
  • ✓ Instant client-side column sorting (numeric & lexical) and live row search
Artifact View Frontend & Artifacts

Live HTML, CSS & JS Artifact Sandbox

Preview self-contained HTML, CSS, and JavaScript snippets live and share them as Claude-style `/v/:id` artifacts.

  • ✓ Opaque null-origin iframe sandbox (`sandbox="allow-scripts"`) prevents cookie or storage access
  • ✓ Instant Claude Artifact-style full-viewport sharing via `/v/:id`
  • ✓ Supports single-file HTML5, inline CSS, Canvas/WebGL, and vanilla JS
Vector & Diagrams Frontend & Artifacts

Online SVG Code Viewer & Vector Sandbox

Paste raw `<svg>` code to inspect crisp vector rendering, viewBox dimensions, and byte size immediately.

  • ✓ Automatic extraction of `viewBox`, intrinsic `width`/`height`, element count, and byte size
  • ✓ Toggleable checkerboard, dark, and light canvas backgrounds for transparent icons
  • ✓ Sandboxed vector rendering prevents embedded `<script>` or `onload` XSS vectors from touching host origin
Docs & Math Docs & Structured Text

Markdown & KaTeX Math Live Previewer

Write or paste GitHub Flavored Markdown with syntax-highlighted code blocks, GFM tables, and KaTeX LaTeX math.

  • ✓ GitHub Flavored Markdown tables, task lists, callouts, and fenced code highlighting
  • ✓ Native inline (`$...$`) and display (`$$...$$`) KaTeX math typesetting without client lag
  • ✓ Editorial Pure Reader View (`/v/:id`) with clean typography and zero chrome
Security Security & Privacy

.env, Log & API Key Secret Scanner

Detect and redact leaked AWS keys, JWTs, database URIs, private keys, and Bearer tokens before sharing.

  • ✓ Detects AWS `AKIA*` keys, PEM private keys, JWTs, GitHub `ghp_*` PATs, and Slack `xox*` tokens
  • ✓ Flags embedded `postgres://`, `mysql://`, `mongodb://`, and `redis://` connection passwords
  • ✓ Counts low-severity PII exposure (emails and public IPv4 addresses) separately

Prefer Piping Straight from Terminal or AI Agents?

Every format viewer on this page is automatically triggered when you pipe output to https://supanote.app/paste or connect via MCP.

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