A marketplace-style toolbox for JSON, JWT, APIs, logs, prompts, files, audio workflows, and WASM-powered utilities.
Core Developer
Format, validate, and inspect API payloads and config files.
Core Developer
Decode JWT headers and claims locally without sending tokens anywhere.
Core Developer
Encode and decode Unicode-safe Base64 strings.
Core Developer
Encode and decode URLs, query strings, redirects, and webhook payloads.
Core Developer
Convert Unix timestamps to local and UTC date strings.
Core Developer
Generate UUID v4 values using the browser crypto API.
Core Developer
Format, validate, and inspect API payloads and config files.
Core Developer
Decode JWT headers and claims locally without sending tokens anywhere.
Core Developer
Encode and decode Unicode-safe Base64 strings.
Core Developer
Encode and decode URLs, query strings, redirects, and webhook payloads.
Core Developer
Convert Unix timestamps to local and UTC date strings.
Core Developer
Generate UUID v4 values using the browser crypto API.
API and Data
Validate OpenAPI JSON/YAML and surface schema issues.
API and Data
Convert cURL commands to C#, JavaScript, Python, or fetch.
AI Engineering
Compare prompt versions and highlight behavioral changes.
AI Engineering
Convert EPUB/PDF chapters into podcast-style audio.
AI Engineering
Turn a public article or site into narrated audio.
Files and Media
Convert PDF documents into EPUB packages.
Daily API, auth, encoding, text, and config utilities.
Core Developer
Format, validate, and inspect API payloads and config files.
Core Developer
Decode JWT headers and claims locally without sending tokens anywhere.
Core Developer
Encode and decode Unicode-safe Base64 strings.
Core Developer
Encode and decode URLs, query strings, redirects, and webhook payloads.
Core Developer
Convert Unix timestamps to local and UTC date strings.
Core Developer
Generate UUID v4 values using the browser crypto API.
Converters and validators for backend/API workflows.
API and Data
Convert YAML to JSON and JSON to YAML.
API and Data
Convert CSV to JSON and JSON arrays to CSV.
API and Data
Format and validate XML using browser DOM parsing.
API and Data
Convert the first Excel worksheet to CSV in the browser.
API and Data
Convert Excel worksheets to JSON locally.
API and Data
Validate OpenAPI JSON/YAML and surface schema issues.
Privacy-aware AI utilities, local where possible and opt-in online where needed.
AI Engineering
Estimate prompt tokens and approximate model cost locally.
AI Engineering
Compare prompt versions and highlight behavioral changes.
AI Engineering
Generate JSON Schema from sample JSON for API and LLM outputs.
AI Engineering
Convert EPUB/PDF chapters into podcast-style audio.
AI Engineering
Turn a public article or site into narrated audio.
Browser runtimes first, with explicit Online Mode for full backend compilers.
Code and Runtime
Run Python snippets with Pyodide in a worker, with optional online fallback later.
Code and Runtime
Execute JavaScript snippets inside an isolated worker with timeout protection.
Code and Runtime
Transpile TypeScript in the browser and inspect JavaScript output.
Code and Runtime
Preview frontend snippets in a sandboxed iframe.
Code and Runtime
Run SQLite queries locally with SQLite WASM.
Code and Runtime
Inspect and run simple no-import WASM modules locally.
WASM-backed file, PDF, archive, calendar, and image tools.
Files and Media
Combine PDF files locally with QPDF WASM inside a worker.
Files and Media
Convert PDF documents into EPUB packages.
Files and Media
Convert PNG, JPG, and WebP with WASM image codecs.
Files and Media
Compress PNG, JPG, and WebP images locally with WASM codecs.
Files and Media
Resize images locally while preserving the input format.
Files and Media
Convert images to and from Base64 data URLs.
Browser-only helpers for auth, keys, certificates, and headers.