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.
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
Color Converter
HEX ↔ RGB · HSL · Tailwind match
Online Diff
Line diff · Copy diff · Local only
Cron Explainer
Plain English · Next runs · Timezone aware
Regex Tester
Live highlights · Snippets · Groups
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
Color Converter
Convert between HEX, RGB, HSL, and Tailwind CSS tokens with instant previews for design handoffs.
HEX ↔ RGBHSLTailwind matchPreview
Online Diff
Compare two snippets or JSON payloads inline to spot additions and removals before committing changes.
Line diffCopy diffLocal onlyJSON friendly
Cron Explainer
Translate cron expressions into plain language summaries and upcoming run times across timezones.
Plain EnglishNext runsTimezone aware5-field
Regex Tester
Highlight regex matches, inspect capturing groups, and load handy snippets for common validation tasks.
Live highlightsSnippetsGroupsCopy matches
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.