Code Snippets Library

Academic Tools

citation_parser.py

python

Accessibility

Accessible Theme Switcher Pattern

accessible_theme_switcher.js

Comprehensive theme switching implementation with accessibility features including screen reader announcements, keyboard navigation, localStorage pers...

javascript 3 deps 5 use cases

altflow_accessible_alt_text.py

python

Keyboard Navigation Patterns

keyboard_navigation_pattern.js

Comprehensive patterns for implementing keyboard navigation, including smooth scrolling with offset, focus management, and WCAG-compliant keyboard int...

javascript 2 deps 7 use cases

link_remediation_pattern.py

python

modal-focus-trap-aria-overlay.js

javascript

Non-Invasive FocusTrap via MutationObserver

mutation-observer-focus-trap.js

Attaches a focus trap to a panel/drawer whose open/close state is controlled by a third-party script (or any code you don't want to modify). The Mutat...

javascript

numeric-shortcut-guard-typing-target.js

javascript

Screen Reader Announcement Patterns

screen_reader_announcements.js

Comprehensive patterns for dynamically announcing content changes to screen readers using ARIA live regions. Essential for accessible SPAs and dynamic...

javascript 2 deps 7 use cases

Skip Links and Landmark Navigation Pattern

skip_links_and_landmarks.html

Comprehensive pattern for implementing skip navigation links and proper HTML5 landmark regions for keyboard and screen reader accessibility.

html 3 deps 6 use cases

Single-Button Theme Cycle Pattern

theme-cycle-single-button.js

Cycles through N themes with one button instead of one button per theme. The button's aria-label always tells screen readers both the current state an...

javascript

url_validation_pattern.py

python

Hex Picker Accessibility Pattern (WordBlocks)

wordblocks-hex-picker-a11y-pattern.md

markdown

Admin Patterns

================================================

admin-dashboard.html

html

express-bearer-admin-router.ts

typescript

health-check-pattern.py

python

hybrid-process-management.py

python

service-registry-pattern.py

python

Agent Orchestration

agent_lifecycle_management.py

python

Citation-aware document generation (PDF + DOCX from agent reports)

citation_aware_document_generation.md

markdown

CitationMonitor: live URL verification across agent outputs

citation_monitor_url_verification.md

markdown

hierarchical_agent_coordination.py

python

Hierarchical Drummer/Camina synthesis (three-tier rollup)

hierarchical_drummer_camina_synthesis.md

markdown

multi_agent_data_models.py

python

multi_platform_bot_adapter.py

python

parallel_agent_execution.py

python

phased_workflow_orchestrator.py

python

provider_abstraction_pattern.py

python

task_decomposition_pattern.py

python

task_tool_dispatch_pattern.py

python

Api Clients

Data Fetching Patterns Guide

DATA_FETCHING_PATTERNS_GUIDE.md

markdown

api-gateway-llm-wrapper.ts

typescript

arxiv_client.py

python

base_provider_pattern.py

python

batch-profile-enrichment-atproto.ts

typescript

bbc_news_client.py

python

bluesky-client-to-server-auth-sync.ts

typescript

cost_optimized_model_selection.py

python

Daily USD spend kill-switch for an LLM proxy

daily-usd-spend-killswitch.md

markdown

hybrid_free_api_provider.py

python

jina_web_scraper.py

python

lazy_loading_provider_factory.py

python

LLM Call with Cache + Offline Fallback (WordBlocks)

llm-cache-with-fallback-pattern.md

markdown

LLM tactic-cycling retry for content-filter recovery

llm-tactic-cycling-retry.md

markdown

llm_temperature_rejection_retry.py

python

location_services_client.py

python

manus-task-api-client.py

python

multi-provider-llm-client.js

javascript

multi_provider_abstraction.py

python

noaa-arcgis-rest-api.py

python

Open-Meteo browser client — keyless forecast + UV + air quality

open-meteo-browser-client.md

markdown

openfoodfacts-api-pagination.py

python

openstreetmap-overpass-api.py

python

paleobiology-database-api.py

python

Multi-Provider Fallback on Recoverable Errors

provider-fallback-on-recoverable-error.md

markdown

provider_adapter_pattern.py

python

Runware API Reference (cross-project)

runware-api-reference.md

markdown

ssrf_protected_og_scraper.ts

typescript

third-party-session-sync-client.ts

typescript

Token-gated provider federation with graceful degradation

token-gated-provider-federation.md

markdown

trpc_blob_upload_bluesky.ts

typescript

unesco-xml-api-parser.py

python

wikipedia_client.py

python

wolfram_alpha_client.py

python

xai_vision_api_integration.py

python

Async Patterns

async_context_managers.py

python

async_llm_operations.py

python

asyncio-singleton-lock.py

python

asyncio_background_thread.py

python

cancelled-flag-useeffect-cleanup.ts

typescript

flask_asyncio_background_thread.py

python

IframePostMessageBridge — promise-based request/response envelope over postMessage.

iframe-postmessage-bridge-with-timeouts.js

javascript

LLM prepass → overlap downstream gens with full payload

llm-prepass-then-full-overlap.md

markdown

multi-lane-priority-queue-with-abort.js

javascript

Parallel coding agents with a consensus safety gate

parallel-coding-agents-with-consensus-gate.md

markdown

parallel_task_execution.py

python

pendingRef: Pass Context Across an Async Cascade Without Threading

pending-ref-across-async-cascade.md

markdown

speculative-prefetch-depth-n-tree.js

javascript

sse-streaming-client.js

javascript

task_cancellation_timeout.py

python

threadpool_concurrent_execution.py

python

useref-for-high-frequency-event-tracking.ts

typescript

useref-stale-closure-cleanup.ts

typescript

Bipolar Dashboard

Multi-Source Data Generator Orchestration

multi-source-data-generator-orchestration.md

markdown

Realistic Content Generation Helpers

realistic-content-generation-helpers.md

markdown

Sine Wave Mood Cycle Pattern

sine-wave-mood-cycle-pattern.md

markdown

By Category

Bluesky / AT Protocol Patterns

bluesky-patterns.md

markdown

Document Processing Snippets

document-processing.md

markdown

Git Index Repair Patterns

git-index-repair.md

markdown

Repository Maintenance Patterns

repository-maintenance.md

markdown

By Domain

Accessibility Planning Patterns

accessibility-planning-patterns.md

markdown

By Pattern

132

Async upstream → local artifact with poll endpoint

async-upstream-to-local-artifact-with-poll.md

markdown

Autosave preserves architecture neutrality during an in-flight council

autosave-preserves-architecture-neutrality.md

markdown

Bearer token in URL hash — shared-secret auth without a login screen

bearer-token-in-url-hash.md

markdown

Pattern: Flask Monolith to Blueprint Extraction

blueprint-extraction-pattern.md

markdown

Build-and-hold: animate a deterministic render by time-slicing its own compute

build-and-hold-deterministic-animation.md

markdown

Build stamp in /health: detecting stale installed PWAs

build-stamp-stale-pwa-reload.md

markdown

Cache-Buster Mismatch Trap (CSS bumped, JS not)

cache-buster-mismatch-trap.md

markdown

Cache + listeners + write-through localStorage — remote pulls trigger React re-renders

cache-listener-write-through.md

markdown

Caddy on_demand TLS permission (Caddy 2.7+)

caddy-on-demand-tls-permission.md

markdown

Merge Canonical + LLM Choices: Dedup by Label, Cap, Distinct Behavior

canonical-vs-llm-choice-merge.md

markdown

Canvas hit-testing via inverse geometry + in-context legend

canvas-lens-probe-and-legend.md

markdown

Pattern: Canonical Capability Registry

capability-registry-pattern.md

markdown

Capacitor 8 → iOS shipping recipe (Vite web app)

capacitor-ios-shipping-recipe.md

markdown

Pattern: Compaction with Re-Attachment

compaction-reattachment-pattern.md

markdown

Composite graph keys when same surface form appears in multiple languages

composite-graph-keys-for-same-spelled-nodes.md

markdown

Consensus-of-Four: adversarial review process

consensus-of-four-adversarial-review.md

markdown

Content Safety Classifier — SSE Buffer Split + Verdict Extraction Pattern

content-safety-classifier-sse-pattern.md

markdown

Context Pill + editingTarget: visible LLM scope bias

context-pill-and-editing-target-for-llm-scope.md

markdown

Server-wide credential-leak sweep

credential-leak-server-sweep.md

markdown

Cross-platform shell gotchas when diffing/syncing over SSH

cross-platform-shell-gotchas-ssh-sync.md

markdown

Cross-repo contract drift gate (copy + checksum manifest + sibling test)

cross-repo-contract-drift-gate.md

markdown

Cynic's binding dissent overriding external consensus

cynic-binding-dissent-over-external-consensus.md

markdown

Data-attribute theme cycle with CSS custom properties

data-attribute-theme-cycle.md

markdown

Dataset divergence composite score

dataset-divergence-composite-score.md

markdown

Date-seeded "X of the day" picker.

date-seeded-word-of-day.js

javascript

Debounced server sync with local-storage fallback

debounced-server-sync-with-local-fallback.md

markdown

Declarative Tray API with `[data-tray-section]` Buttons

declarative-tray-with-data-attribute-buttons.md

markdown

Default-off opt-in flip with localStorage backward-compat

default-off-opt-in-localstorage-flip.md

markdown

degenerate-result-rejection.py

python

Design-spec "pixel-perfect" clause admits two readings

design-spec-pixel-perfect-clause-two-readings.md

markdown

Diff-acknowledgment prompt rule for LLM-driven branching narratives

diff-acknowledgment-prompt-rule.md

markdown

Dual time-zone display: render the same instant in two zones

dual-timezone-display-via-intl.md

markdown

Pattern: Durable System Prompt Instructions

durable-system-prompt-instructions.md

markdown

Pattern: Execution Spine Event Model

execution-spine-event-model.md

markdown

Pattern: Fail-Closed Shell Command Analysis

fail-closed-shell-command-analysis.md

markdown

Fail-open LLM pipeline with errors-as-data

fail-open-insight-pipeline.md

markdown

Fastlane: metadata-only uploads + device-prefix screenshot staging

fastlane-deliver-screenshot-staging.md

markdown

Tiny in-process job runner for Flask

flask-inmemory-job-runner.md

markdown

Flask Input Validation Pattern

flask-input-validation.md

markdown

Prefix-aware Flask under Caddy `handle_path`

flask-reverse-proxy-script-name.md

markdown

Font scale accessibility control

font-scale-a11y-control.md

markdown

`@functools.cache` singleton factory

functools-cache-singleton.md

markdown

git-filter-repo-key-scrub.md

markdown

Pattern: Git Log as Structured Status Feed

git-log-structured-status-feed.md

markdown

GitHub 100 MB-per-file limit: when binary assets exceed it

github-100mb-binary-asset-strategy.md

markdown

Global Default + Per-Entity Metadata Override

global-default-with-per-entity-metadata-override.md

markdown

GoatCounter Snippet Injection

goatcounter-snippet-injection.md

markdown

Headless Chrome FPS A/B measurement (and the idle-throttle trap)

headless-chrome-fps-ab-measurement.md

markdown

HuggingFace `load_dataset` with streaming fallback

hf-dataset-load-with-streaming-fallback.md

markdown

Pattern: Hook Lifecycle Infrastructure

hook-lifecycle-infrastructure.md

markdown

htm + ESM single-file React app (no build step)

htm-esm-single-file-react.md

markdown

IIFE-wrap classic `<script>` "modules" to avoid top-level const collisions

iife-wrap-classic-script-modules.md

markdown

Interactive seeded to-do list with check, edit, hide, reset, add

interactive-seeded-todo-with-overrides.md

markdown

iOS PWA: Composing safe-area-inset Into Bottom-Anchored Chrome

ios-pwa-safe-area-composition.md

markdown

Leaflet custom "locate me" control

leaflet-custom-locate-control.md

markdown

LLM-backed structured-edit engine with deterministic fallback

llm-backed-structured-edit-engine-with-fallback.md

markdown

Hard timeout on a (possibly hung) LLM call, with deterministic fallback — Flask/WSGI

llm-call-hard-timeout-with-fallback.md

markdown

LLM-emitted condition name guard (fail-open on phantoms)

llm-condition-name-guard-fail-open.md

markdown

LLM Content Guardrails Pattern

llm-content-guardrails.md

markdown

LLM gateway: module-level semaphore + 429 exp-backoff

llm-gateway-concurrency-and-retry.md

markdown

LLM Tool Calling Loop Pattern

llm-tool-calling-loop.md

markdown

Pattern: Memory with Path-Scoped Rules

memory-path-scoped-rules.md

markdown

Merge ranked lists from N sources, dedup, sort by priority + score

merge-ranked-sources-with-priority.md

markdown

Pattern: Multi-Source Drift Detection

multi-source-drift-detection.md

markdown

Pattern: Named-Array → Lookup Map Helper

named-array-lookup-helper.md

markdown

@Observable settings with UserDefaults write-through (no Combine)

observable-userdefaults-settings.md

markdown

Ollama "local" sentinel for keyless BYOK

ollama-local-sentinel-byok.md

markdown

Open-mode trusted-pair: dropping auth when the URL is the access boundary

open-mode-no-auth-trusted-pair.md

markdown

Package Independence Test

package-independence-test.md

markdown

Pattern: Parallel-Scaffold Blueprint Migration

parallel-scaffold-blueprint-migration.md

markdown

Partial-column-coverage surface-form fallback with per-row match_mode

partial-column-coverage-matchmode-fallback.md

markdown

Patch-id subset check for branch safety

patch-id-subset-check-for-branch-safety.md

markdown

Per-theme WCAG contrast locked in by unit tests

per-theme-wcag-contrast-test.md

markdown

Per-Turn Rule Prepend: surviving long-system-prompt drift

per-turn-rule-prepend-for-llm-drift.md

markdown

Snippet: Periodic Repo Hygiene Sweep

periodic-repo-hygiene.md

markdown

Pillow Dynamic Card Renderer Pattern

pillow-dynamic-card-renderer.md

markdown

Pillow PNG-thumb → JPEG sweep, bomb-safe

pillow-thumb-sweep-png-to-jpeg.md

markdown

Pattern: Plugin Enablement Precedence

plugin-enablement-precedence.md

markdown

pre-commit-untracked-secret-audit.md

markdown

Pattern: Prompt Boundary Splitting

prompt-boundary-pattern.md

markdown

Prose-Diff Above the JSON: making an op-based contract readable

prose-diff-for-op-proposals.md

markdown

Pattern: Provider Gateway Normalization

provider-gateway-normalization.md

markdown

Provider-Spec table collapse for multi-provider HTTP APIs

provider-spec-table-collapse.md

markdown

Snippet: Public Repo Cleanup Workflow

public-repo-cleanup-workflow.md

markdown

PWA Icon Generator: SVG → Raster PNGs With Maskable Variants

pwa-icon-generator-from-svg.md

markdown

PWA Rich Android Install Dialog Requirements

pwa-rich-android-install-dialog.md

markdown

PWA → iOS via xcodegen + WKWebView (bundled assets)

pwa-to-ios-bundled-wkwebview.md

markdown

PWA → iOS phone UX checklist

pwa-to-ios-phone-ux-checklist.md

markdown

Pattern: Reconstruct `.py` Source from `.pyc` Bytecode

pyc-to-py-source-reconstruction.md

markdown

Pattern: Recovery from Context Overflow and Failures

recovery-patterns-context-overflow.md

markdown

Redacted LLM error hints in UI

redacted-llm-error-hint.md

markdown

Migrate CDN-hosted thumbnails to local without re-downloading

regenerate-thumbnails-from-existing-fulls.md

markdown

Pattern: Registry-Driven Artifact Generation

registry-artifact-generators.md

markdown

Pattern: Remote Tool Caching

remote-tool-caching.md

markdown

Schema-Driven Form Renderer with Target Descriptors

schema-driven-form-renderer.md

markdown

Scrub-not-reimport when derived data has drifted from source-of-truth

scrub-not-reimport-when-derived-data-drifted.md

markdown

Self-healing LLM authoring pipeline

self-healing-llm-authoring-pipeline.md

markdown

Shell-adapter monkey-patch-render pattern

shell-adapter-monkey-patch-render.md

markdown

Sidecar markdown notes

sidecar-markdown-notes.md

markdown

Single-file canonical nav for static + Flask multi-page sites

single-file-canonical-nav.md

markdown

Single-user server-JSON persistence

single-user-server-json-persistence.md

markdown

Pattern: Skills as Executable Specs

skills-as-executable-specs.md

markdown

SSH probe via stdin-fed bash

ssh-stdin-fed-bash-probe.md

markdown

SSH tar-pipe through a relay host

ssh-tar-pipe-through-relay.md

markdown

Detecting Stale CLAUDE.md After Rebuild / Swap Commits

stale-claudemd-after-rebuild-commits.md

markdown

Stale-serve for caches keyed on a fast-rotating revision

stale-serve-rev-keyed-cache.md

markdown

streamed-json-prefix-extract.js

javascript

Pattern: Streaming Tool Execution

streaming-tool-execution.md

markdown

Bidirectional subpath-prefix helper for Caddy-mounted services

subpath-prefix-bidirectional.md

markdown

Generative-app core: value types, shareable seeds, off-main render

swift-generative-core-value-types.md

markdown

SwiftUI offscreen snapshot for visual QA of a Canvas view

swiftui-offscreen-face-snapshot.md

markdown

Swiss Design Timeline Component

swiss-design-timeline.md

markdown

Text-Length-Scaled Auto-Advance

text-length-scaled-auto-advance.md

markdown

Text-rolodex attribution pattern

text-rolodex-attribution.md

markdown

Thorny-first rebase conflict ordering

thorny-first-rebase-conflict-ordering.md

markdown

Three-runtime parity contract (Python ↔ JS ↔ Swift)

three-runtime-parity-contract.md

markdown

Three-theme CSS with legacy alias compatibility shim

three-theme-css-with-legacy-aliases.md

markdown

Gerstner waves that stay stable when the water plane follows the camera

threejs-gerstner-follow-cam.md

markdown

Three.js scene-depth pre-pass (packed RGBA8)

threejs-scene-depth-prepass.md

markdown

Tolerant JSON extraction from LLM output

tolerant-llm-json-extraction.md

markdown

Pattern: Topocentric Overlay on a Heliocentric Scene

topocentric-overlay-on-heliocentric-scene.md

markdown

Pattern: URL-Driven Entry Mode for SPAs

url-driven-entry-mode.md

markdown

useOverrides + InlineEdit — editable-blocks pattern over seeded data

use-overrides-edit-hook.md

markdown

Vanilla bottom sheet with breakpoint reparenting (no duplicate DOM)

vanilla-bottom-sheet-breakpoint-reparent.md

markdown

Vanilla JavaScript State Management Pattern

vanilla-js-state-management.md

markdown

`visibilitychange` → sync on tab focus

visibilitychange-sync-on-tab-focus.md

markdown

Vite + Caddy + wouter — SPA at a non-root sub-path

vite-caddy-subpath-spa-with-wouter-base.md

markdown

Installable PWA served at a subpath (vite-plugin-pwa + Caddy handle_path)

vite-plugin-pwa-installable-at-subpath.md

markdown

Vite PWA: precache `public/` static assets for true offline + the config-shadowing footgun

vite-pwa-offline-static-assets.md

markdown

Brace-balanced wikitext template tokenizer

wikitext-brace-balanced-tokenizer.md

markdown

WKWebView native shell: the hardening delegates

wkwebview-native-shell-delegates.md

markdown

XCUITest screenshot automation for WKWebView apps

xcuitest-webview-screenshot-automation.md

markdown

By Project

Snippet: Public Release Gitignore — FastAPI + SvelteKit Project

blueballs-public-release-gitignore.md

markdown

Snippets: linguistic-api Phase 1 Consolidation

linguistic-api-phase1-consolidation.md

markdown

Cli Tools

analyze-distribution.py

python

Bash ANSI Cursor Animation Skeleton

bash-ansi-cursor-animation-skeleton.md

markdown

Bash ANSI Modular Effect Library

bash-ansi-modular-effect-library.md

markdown

Bash: Cron + cURL API Automation

bash-cron-api-automation.md

markdown

Snippet: Formatted Terminal Output with Colors and Boxes

bash-formatted-output.md

markdown

Bash: Multi-Platform Skill Sync

bash-multi-platform-skill-sync.md

markdown

Bash: Publish Each Entry from a JSON Manifest

bash-publish-from-json-manifest.md

markdown

Bash Terminal Coordinate Geometry

bash-terminal-coordinate-geometry.md

markdown

Snippet: CLI Output Parsing from Noisy Sources

cli-output-parsing.md

markdown

color-palette.py

python

d3-scaffold.py

python

fetch-arxiv.py

python

interactive_cli_with_llm.py

python

Multi-Repo Bash Sweep with GitHub Visibility Filter

multi-repo-sweep-public-only.md

markdown

Snippet: Parallel CLI Execution

parallel-cli-execution.md

markdown

Configuration

SPA auth strategy: which pattern fits

spa-auth-strategy-decision-tree.md

markdown

vite-strict-port-caddy-proxy.js

javascript

Configuration Management

Cross-host git-repo parity when one host can't reach the remote

cross-host-git-repo-parity.md

markdown

Cross-runtime precedence ladder (JS + Python must agree)

cross-runtime-precedence-ladder.md

markdown

Dead-letter field detection (storage → wire → renderer)

dead-letter-field-detection.md

markdown

Bump the localStorage key version to unpin a changed default

localstorage-key-version-bump-to-unpin-defaults.md

markdown

Multi-host config sync preserving per-host secrets

multi_host_config_sync.md

markdown

multi_source_config.py

python

Run a service from its source repo, not a deployed copy

run-service-from-repo-not-a-copy.md

markdown

Version-control an /etc config dir and prune its backup pile

version-control-etc-config-and-prune-backups.md

markdown

Controls

Reset Button Pattern for Visualizations

reset-button-pattern.md

markdown

Css

Adopt a design system on a legacy page by aliasing its existing CSS vars

design-system-adoption-via-var-aliasing.md

markdown

Strip dead CSS rules by selector (brace-matched, assertion-guarded)

strip-dead-css-rules-by-selector.md

markdown

Tabs: active-indicator + divider hairline overlap

tab-active-indicator-hairline-overlap.md

markdown

Terminal-green theme (the `dr.eamer.dev/clocks` ASCII look)

terminal-green-theme.md

markdown

Theme variants via body class — single shared CSS, multiple palettes

theme-variants-via-body-class.md

markdown

Data Pipelines

multi-strategy-geocoding.py

python

Notion-export Markdown → HTML (python-markdown)

notion-markdown-to-html.md

markdown

Single-seam canonical → prototype adapter

single-seam-canonical-prototype-adapter.md

markdown

world-bank-api-refresh.py

python

Data Processing

auto-metadata-generation.py

python

canonical_key_reconciliation.py

python

Casual Data Annotations Pattern

casual-data-annotations.md

markdown

data_aggregation_pipeline_patterns.py

python

data_sanitization_patterns.py

python

dataset-quality-validation.py

python

format_conversion_patterns.py

python

json_narrative_parser.py

python

json_validation_patterns.py

python

llm-json-parse-with-regex-fallback.ts

typescript

polars-dataset-profiling-at-scale.py

python

pydantic_validation_patterns.py

python

Rolling History Summary from Flat Event Log

rolling-history-summary-from-event-log.md

markdown

sibling_db_heavy_load_sqlite.py

python

Data Visualization

Canvas Migration Pattern for Large Point Datasets

canvas-migration-pattern.md

markdown

Canvas2D neon-peg glow renderer

canvas2d-neon-peg-glow.md

markdown

Chart.js Responsive Dashboard Patterns with Theme Support

chart-js-responsive-dashboards.js

Complete patterns for creating interactive, themeable dashboards using Chart.js. Includes bar charts, radar charts, bubble charts, and theme switching...

javascript 2 deps 5 use cases

Chronological Visualization Date Assignment Pattern

chronological-visualization-date-assignment.md

markdown

D3.js Force-Directed Network Visualization with Mobile Support

d3-force-network-visualization.js

Complete pattern for creating interactive force-directed graphs showing relationships between entities. Includes mobile touch handling, filtering, too...

javascript 2 deps 5 use cases

D3.js Geographic Point Sampling Patterns

d3-geographic-point-sampling.md

markdown

D3.js Radial Tree Pattern

d3-radial-tree-pattern.md

markdown

D3.js Sankey Flow Diagram Pattern

d3-sankey-flow-pattern.md

markdown

Data Transformation and Utility Functions for Visualizations

data-transformation-utils.js

Comprehensive collection of utility functions for data loading, parsing, formatting, filtering, and state management in data visualization projects. P...

javascript 1 deps 6 use cases

Pattern: Date-Based Radial Positioning for Tree Nodes

date-based-positioning.md

markdown

leaflet-choropleth-map.js

javascript

Non-Linear Time Axis + Wide-Range Magnitude Encoding

nonlinear-time-axis-and-magnitude-encoding.md

markdown

Pattern: Radial Constraint with Clamped Offsets

radial-constraint-pattern.md

markdown

Radial Force Constraint Tuning Pattern

radial-force-constraint-tuning.md

markdown

Snippet: README Generation for Data Visualizations

readme-generation-datavis.md

markdown

SVG Performance Sampling Pattern

svg-performance-sampling.md

markdown

Interactive Timeline Animation with Projection Capability

timeline-animation-interactive.js

Complete pattern for creating animated timelines showing historical progression with future projections. Includes playback controls, speed adjustment,...

javascript 3 deps 5 use cases

Viewport Culling Pattern for Map Visualizations

viewport-culling-pattern.md

markdown

Database Patterns

dexie-indexeddb-typed-crud.ts

typescript

indexeddb-eviction-sentinel.ts

typescript

The NULL-distinct UNIQUE-index footgun (and the deterministic-key fix)

null-distinct-unique-index-dedupe.md

markdown

SQLite WAL Mode Performance Configuration

sqlite-wal-performance.md

markdown

sqlite_flask_simple_pattern.py

python

sqlite_threading_safe.py

python

Datavis

Aurora Hover Sync Pattern

aurora-hover-sync.md

markdown

Branch Color Mapping for Tree Visualizations

branch-color-mapping.md

markdown

Geocoding Cache Pattern for Data Pipelines

geocoding-cache-pattern.md

markdown

French Republican decimal time + equinox-true calendar (JS)

republican-decimal-time-and-calendar.md

markdown

Social Card Generator (Pillow)

social-card-generator-pil.md

markdown

Social Card Meta Tags Pattern

social-card-meta-tags.md

markdown

Three.js readPixels → ASCII pipeline

threejs-readpixels-to-ascii.md

markdown

Time Markers Overlay Pattern

time-markers-overlay.md

markdown

Drift-free UTC clock tick loop (with a11y minute-gating)

utc-clock-tick-loop.md

markdown

Deduplication

file_deduplication.py

python

pillow_ahash_dedup.py

python

Design Systems

Snippet: Collapsible Details Pattern (Pure HTML/CSS)

collapsible-details-pattern.md

markdown

Dashboard Variant Design Patterns

dashboard-variant-patterns-2026-02-14.md

markdown

Filing Cabinet Interface Pattern

filing-cabinet-interface.md

markdown

Glassmorphism CSS Design Pattern

glassmorphism-css-pattern.md

markdown

mobile-first-responsive-controls.md

markdown

Snippet: Sidebar UX Restructure Pattern

sidebar-ux-restructure.md

markdown

Typewriter Animation Pattern

typewriter-animation.md

markdown

Error Handling

graceful_import_fallbacks.py

python

File Operations

base64-datauri-download.js

javascript

client-side-file-size-validation.js

javascript

comprehensive_document_parser.py

python

config_file_loading.py

python

Directory Cleanup Patterns

directory-cleanup-patterns.md

markdown

module_discovery.py

python

path_handling_utils.py

python

yaml_frontmatter_markdown_parser.py

python

Geepers Chat Demo

Bottom-Anchored Peek Notification

bottom-peek-pill.md

markdown

Cross-Surface Pin Sync (Hex Tile → Magic Panel)

cross-surface-pin-sync.md

markdown

Smart Hex Expansion (Open-Slot Aware)

smart-hex-expansion.md

markdown

Html

circle_menu_fanout.html

html

Snippet: Lazy Symbol Loader with IntersectionObserver + MutationObserver

lazy-symbol-loader-intersection-observer.md

markdown

Subresource Integrity (SRI) for CDN Scripts

sri-hash-cdn-security.html

html

Langgraph Patterns

react_agent_pattern.py

python

Llm Patterns

Rolling continuity "state bible" for long LLM conversations

rolling-continuity-state-bible.md

markdown

Mobile Capacitor

capacitor-platform-detection.ts

typescript

capacitor-plugin-bridge.ts

typescript

Patterns

Code Snippets - 2026-01-05 Checkpoint

2026-01-05-checkpoint.md

markdown

FastAPI CORS Security Pattern

fastapi-cors-security.md

markdown

FastAPI User Feedback System Pattern

fastapi-user-feedback-system.md

markdown

Groupchat Patterns — Harvested 2026-03-06

groupchat-patterns-2026-03-06.md

markdown

Python Specific Exception Handling Pattern

python-specific-exception-handling.md

markdown

Tree-Merge Cycle Guard

tree-merge-cycle-guard.md

markdown

Process Management

service-manager-pattern.py

python

Publishing

Audit a published package for vendored / secret leaks

audit-published-package-for-vendored-leaks.md

markdown

Snippet: Awesome-List PR Submission Workflow

awesome-list-pr-workflow.md

markdown

Snippet: Bulk GitHub Repository Creation

bulk-github-repo-creation.md

markdown

Snippet: Bulk GitHub Repo Humanize + README Audit

bulk-repo-humanize-audit.md

markdown

Multi-Platform Dataset Publishing

multi-platform-dataset-publishing.md

markdown

Snippet: Multi-Repo Skill Rename Convention

multi-repo-skill-rename-convention.md

markdown

New Public Repo Checklist

new-public-repo-checklist.md

markdown

Python

wordclock_span_solver.py

python

Python Test Patterns

Pattern: HTTP Client Test Fixtures with Realistic Mock Payloads

http-client-mock-conftest.md

markdown

Pattern: Mocking LLM Provider SDK Imports in pytest

llm-provider-mock-pattern.md

markdown

Per-test SQLite isolation for a module-global DB manager (pytest)

pytest-per-test-sqlite-isolation.md

markdown

Real Time Dashboards

chartjs_socketio_integration.html

html

dashboard_state_management.py

python

flask_socketio_broadcaster.py

python

socketio_emit_from_background.py

python

Security

api-key-env-scrub.py

python

Caddy `respond 404` regex: blocking server-side files inside a public web root

caddy-respond-404-regex-file-blocking.md

markdown

Pattern: Fail-Closed Shell Command Analysis

fail-closed-shell-analysis.md

markdown

sri-cdn-security.md

markdown

HTML Sanitization Function - XSS Prevention

xss-prevention-escapehtml.js

javascript

xss-prevention-tooltip.md

markdown

xss-safe-dom-construction.js

javascript

Sentiment Analysis

vader_sentiment_analyzer.py

python

Social Media Clients

at-protocol-uri-construction.ts

typescript

at_protocol_facet_computation.ts

typescript

Post an image + alt text to Bluesky from the browser — no SDK, no server.

bluesky-browser-post-with-alt.js

javascript

bluesky_at_protocol_client.py

python

Spatial Algorithms

hex-grid-smart-spawn.ts

typescript

inter-cluster-proximity-lines.ts

typescript

Streaming

paragraph_stream_buffer.py

python

section_stream_buffer.py

python

Streaming Patterns

anthropic-web-search-sse-citations.py

python

Buffered Tag Parser for Streaming Text

buffered-tag-parser.md

markdown

flask_sse_blueprint_ollama_provider.py

python

multi-provider-sse-mixed-yield-normalization.py

python

Hardened NDJSON→SSE streaming proxy (Flask)

ndjson-to-sse-hardened-proxy.md

markdown

Per-section unlock state machine for streaming generation UIs

per-section-unlock-state-machine.md

markdown

sse_streaming_responses.py

python

Telegram Bot Patterns

Privacy-Respecting Bot Patterns

privacy-patterns.md

markdown

Telegraph

telegraph_llm_tool.py

python

telegraph_publisher.py

python

Testing

Blob round-trip through fake-indexeddb in Vitest/jsdom (the {} gotcha)

fake-indexeddb-blob-roundtrip-vitest.md

markdown

pytest_fixtures_patterns.py

python

Tool Registration

Pattern: Deterministic Tool Pool Assembly

deterministic-tool-pool.md

markdown

mcp_stdio_server_pattern.py

python

swarm_module_pattern.py

python

Trpc

jwt-cookie-context.ts

typescript

procedure-tiers.ts

typescript

Typescript Package Exports

SNIPPET: Handling Major Version Dependency Upgrades

dependency-major-version-upgrade.md

markdown

Ui Patterns

Additive shell adapter — one app brain, many DOM geometries

additive-shell-adapter-render-monkeypatch.md

markdown

Chat-first editor onboarding affordances (creation lane, prompt deck, mood theming)

chat-first-editor-onboarding-affordances.md

markdown

Confirm-before-speak (never auto-speak generated output)

confirm-before-speak-aac.md

markdown

CSS-variable-driven SVG silhouettes with explicit-fill swatches

css-var-svg-silhouette-with-swatches.md

markdown

DOM-teleport overlay (focus-mode pattern)

dom-teleport-overlay.md

markdown

Focus-trap for modal overlays (vanilla JS)

focus-trap-modal.md

markdown

Host-agnostic mount module pattern

host-agnostic-mount-module.md

markdown

Long-Press Touch Drag vs Canvas Pan

long-press-drag-vs-canvas-pan.md

markdown

Multi-store fresh-start coordination

multi-store-fresh-start.md

markdown

Persistent floating "customer-service-bot" chat dock

persistent-floating-chat-dock.md

markdown

Platform-Gated Optional Prop (Hide UI Without Runtime Flags)

platform-gated-optional-prop.md

markdown

Recently-added filter + badge

recently-added-filter.md

markdown

Responsive Horizontal Controls Pattern

responsive-horizontal-controls.md

markdown

Singleton In-Flight Spinner

singleton-in-flight-spinner.md

markdown

Small pixel-art glyphs: hate-symbol hazard + reliable digit/flip patterns

small-pixel-glyph-hazards-and-flip-clocks.md

markdown

Sort dropdown that composes with `[hidden]` filtering

sort-composes-with-hidden-filter.md

markdown

SwiftUI WidgetKit + Canvas: two gotchas that bite

swiftui-widgetkit-canvas-face-gotchas.md

markdown

Web Speech API TTS wrapper (speak / cancel / support-check)

web-speech-tts-wrapper.md

markdown

Utilities

ascii-language-detection.ts

typescript

base-class-pattern.py

python

blob-url-lifecycle.js

javascript

cache_manager_redis_fallback.py

python

crypto_utilities.py

python

datetime_utilities.py

python

embedding_generation_similarity.py

python

env_config_utilities.py

python

ES6 Module Lazy Loading Pattern

es6-lazy-loading-pattern.md

markdown

flask_image_handling.py

python

logging_utilities.py

python

rate_limiter.py

python

redis_cache_manager.py

python

retry_decorator.py

python

scan-dir-build-platform-manifests.py

python

string_utilities.py

python

timezone_and_duration_utilities.py

python

TypeScript: JSON File State Persistence

typescript-json-state-persistence.md

markdown

Vision Patterns

Provenance bulk-classify pattern

provenance-bulk-classify.md

markdown

Snippet: Three.js Tooltip Guard Clause

threejs-tooltip-guard-clause.md

markdown

vision_client.py

python

vision_enrich_with_references.py

python

Web Clocks

Accessibility

accessibility.md

markdown

Canvas Animation & Rendering

canvas-animation.md

markdown

Color & Color-Space Math

color.md

markdown

CSS Effects & Tricks

css-tricks.md

markdown

Interaction & Input

interaction.md

markdown

Layout & Responsive Canvas

layout-responsive.md

markdown

Math, Easing & Interpolation

math.md

markdown

Miscellaneous

misc.md

markdown

Numeral Systems & Encoders

numeral-systems.md

markdown

Performance

performance.md

markdown

Physics & Simulation

physics.md

markdown

SVG

svg.md

markdown

Text Rendering

text-rendering.md

markdown

Time Math & Scheduling

time-math.md

markdown

WebGL & Shaders

webgl-shaders.md

markdown

Web Frameworks

Audio/Video Feature Quick Start Guide

AUDIO_VIDEO_QUICK_START.md

markdown

anonymous_owner_token_with_email_claim.py

python

Device Pairing → Opaque Bearer Token Auth (web-to-native handoff)

device-pairing-token-auth.md

markdown

Flask + SQLite-WAL versioned KV store — two-writer sync without a database

flask-sqlite-wal-kv-store.md

markdown

flask-sse-endpoint.py

python

flask-sse-passthrough.py

python

flask_api_gateway_route_templates.py

python

flask_audio_file_handler.py

python

flask_authentication_decorators.py

python

flask_blueprint_organization.py

python

flask_blueprint_with_url_prefix.py

python

flask_cross_db_attach_readonly.py

python

flask_factory_pattern_with_blueprints.py

python

flask_limiter_per_blueprint_key.py

python

flask_limiter_proxyfix_real_client_ip.py

python

flask_middleware_patterns.py

python

flask_multi_provider_api_proxy.py

python

flask_multipart_file_upload.py

python

flask_prefixed_cache_multi_tenant.py

python

flask_socketio_setup.py

python

flask_video_generation_handler.py

python

Gunicorn + Eventlet Deployment Guide for Flask-SocketIO

gunicorn_socketio_deployment.md

markdown

gunicorn_socketio_deployment.py

python

html_to_markdown_edit_roundtrip.py

python

Idempotent log-on-merge endpoint (buffer-then-patch client)

idempotent-log-on-merge.md

markdown

Loading States and Error Handling Pattern for API Calls

javascript_loading_states_pattern.js

Robust pattern for managing loading states, error handling, and success feedback in frontend applications.

javascript 1 deps 4 use cases

llm_image_proxy_subject_style_split.py

python

Playwright social-card / OG-image capture from a live page

playwright-social-card-capture.md

markdown

Quota-guarded speculative prefetch

quota-guarded-prefetch.md

markdown

Renderless Manager → React Event Bridge

renderless-manager-to-react-event-bridge.md

markdown

Self-registering renderer registry with shape-sniffing (vanilla JS)

self-registering-renderer-registry.md

markdown

telegram_html_formatter.py

python

Websocket Patterns

react-ws-collab-hook.ts

typescript

websocket_client_with_reconnect.py

python

websocket_firehose_reconnection.py

python