Developer Parsers & Encoders

Format, encode, parse, and inspect developer data entirely client-side. Protect sensitive code and tokens with these secure, zero-upload dev tools.

ZERO UPLOAD · ALL LOCAL
Developer Parsers & Encoders Format, encode, parse, and inspect developer data entirely client-side. Protect sensitive code and tokens with these secure, zero-upload dev tools.
Live Tools Last Update
JSON Formatter, Validator & Tree Viewer Pretty-print, minify, and browse JSON in a collapsible tree with syntax highlighting.
2026-07-10
Regex Tester & Match Debugger Live match highlighting, capture groups, and step-through debugging for any pattern.
2026-07-10
UUID v1, v4 & v7 Generator Five display formats, cryptographically random output, and 100% local generation.
2026-06-28
Hash Generator: MD5, SHA-1, SHA-256 & SHA-512 MD5, SHA-1, SHA-256, SHA-512 hashes and HMAC — all computed locally, nothing uploaded.
2026-05-20
Big Log Explorer Filter, search, and graph 500 MB+ log and JSONL files locally — Web Workers and IndexedDB, nothing uploaded.
2026-05-19
Prompt Token Counter Count tokens for GPT-5.6, Claude Opus 5, Gemini 3.6, Kimi K3, and 33+ more AI models — live pricing updated daily, nothing leaves your browser.
2026-05-19
SQL Data Workbench Query local files with SQL — Parquet, Arrow, Feather, Avro, DBF, Excel, CSV, JSON and more. Zero upload, runs entirely in your browser.
2026-05-15
Base64 Text & File Encoder/Decoder Converts between raw data and Base64 entirely client-side, so nothing ever leaves your browser.
2026-05-06
Cron Expression Parser & Next-Run Preview Translate cron syntax into plain English and see upcoming run times at a glance.
2026-04-25
JWT Decoder & Claims Inspector Decode the header and payload, check expiry and claims, all client-side.
2026-04-24
In Development Planned Release
Text / Code Diff Viewer Side-by-side and unified diff with line-level highlighting.
2026-08
Binary Package Differ Diff two ZIP archives or build artifacts in-browser — file-level tree view, size delta, and byte-level changes. Zero upload.
2026-08
WASM Binary Inspector Inspect and decompile WebAssembly binaries to WAT in your browser — memory map, exports, imports, zero upload.
2026-08
About This Category

Why use offline developer utilities?

Every time you paste a JWT token, a private key, or a customer record into an online tool, you are trusting a server you cannot audit. Browser-based developer utilities eliminate that risk entirely because they run as client-side JavaScript, which means your data never leaves the tab.

The tools in this category cover the most common data-wrangling tasks: validating JSON before feeding it to an API, encoding a binary blob as Base64 for transport, generating collision-resistant UUIDs without relying on a remote service, and inspecting cron expressions in plain English. All of it happens locally, with no logging, no analytics on your inputs, and no rate limits.

Because the tools are statically served, they also work offline after the initial page load. Bookmark them once and you have a reliable local toolbox that is available even when your internet connection is not.

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