JSON Formatter
Clean, validate, and convert JSON with instant previews, YAML and CSV export, and a collapsible tree viewer.
Pretty printMinifyYAML/CSVTree view
Privacy-first dev tools
Developer utilities that live in your browser.
DevTools Today is a collection of privacy-first helpers for formatting data, converting API calls, decoding tokens, and wiring growth pages. Nothing leaves your tab, every tool uses the same polished layout, and each page ships with SEO-ready content out of the box.
Pick a tool to get started — results update instantly and you can switch between utilities without losing focus.
JSON Formatter
Pretty print · Minify · YAML/CSV
curl to fetch converter
Fetch · axios · Python
JWT Decoder
Header & payload · Expiry insight · Signature formats
Base64 Encoder & Decoder
UTF-8 safe · URL friendly · Instant copy
UUID Generator
UUIDv4 · Batch output · Uppercase option
URL Encoder & Decoder
Percent encode · Decode · Plus-space toggle
Featured tools
Launch-ready utilities built to attract organic traffic, showcase ads politely, and earn repeat visits from your team.
curl to fetch converter
Turn curl commands into JavaScript fetch, axios, or Python requests snippets without leaving the browser.
FetchaxiosPythonPrivacy-first
JWT Decoder
Decode JSON Web Tokens, inspect registered claims, and copy payloads without exposing secrets to a server.
Header & payloadExpiry insightSignature formatsLocal only
Base64 Encoder & Decoder
Convert text to Base64 or decode existing payloads with Unicode-safe processing and clipboard shortcuts.
UTF-8 safeURL friendlyInstant copyOffline
UUID Generator
Generate batches of RFC 4122 UUIDv4 identifiers using the browser crypto API and copy them in one click.
UUIDv4Batch outputUppercase optionClipboard ready
URL Encoder & Decoder
Percent-encode URLs and query strings or decode existing values with plus-space support for form data.
Percent encodeDecodePlus-space toggleQuery helpers
Built for recurring traffic and monetization
Each tool keeps ad slots lightweight and positions FAQs with JSON-LD schema out of the box. Add more utilities as you grow and the design stays cohesive.
Privacy by default
Every transformation happens in your browser so keys, payloads, and headers never leave your machine.
Ready for focus
A clean interface with dark mode, keyboard shortcuts, and mobile-friendly layouts keeps you in flow.
Designed for growth
SEO-friendly copy, FAQ schema, and ad-ready slots make it easy to launch and monetize fast.
7-day launch plan
- Spin up Next.js and Tailwind shell.
- Ship JSON formatter core flow.
- Launch curl conversion and JWT decoding tools.
- Add Base64 and URL encoding utilities.
- Generate UUID batches with clipboard shortcuts.
- Polish dark mode, navigation, and mobile layouts.
- Wire metadata, FAQ schema, ads, and sitemap.
What is next?
The roadmap now targets cron expression debuggers, screenshot helpers, and HTML-to-JSX converters. Each ships inside the same layout so visitors exploring one tool can discover the rest.