JSON Formatter
Format, validate, and minify JSON locally in your browser.
Developer Essentials
Encoding, hashing, regex, UUIDs, JWT inspection, and other daily browser utilities for engineers. Browse this curated wowTools collection of local browser
Overview
Developer Essentials is a curated set of browser utilities for the chores that interrupt coding flow: encode a string, explain a cron expression, generate a UUID, inspect a JWT, or test a regex—without installing another CLI or pasting secrets into a random website. Everything here is designed to stay on-device whenever possible.
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Base64 Encode/Decode
Unicode-safe Base64 encode/decode for text and files locally.
URL Encode/Decode
URL percent-encoding with component and URI modes locally.
Hash Generator
SHA-256/512 hashing for text and files via Web Crypto.
UUID Generator
Generate UUID v4 and v7 IDs locally with bulk output.
JWT Decoder
Inspect JWT header and payload locally—no signature verify.
Regex Tester
Test regex patterns with flags, highlights, and safe timeout protection.
Password Generator
Secure local password generator with strength meter.
Diff Checker
Line-level text diff with inline and side-by-side views.
Timestamp Converter
Convert Unix timestamps and dates with timezone display.
Why these tools
These tools map to high-frequency developer intents. Encoding and hashing cover transport and integrity checks. UUID and password generators create identifiers and secrets locally. JWT Decoder and Regex Tester help you inspect tokens and patterns safely. Diff and timestamp helpers round out everyday debugging.
Related articles
- What is JWT?Understand JSON Web Tokens—header, payload, signature—and how to inspect claims locally without treating decoding as verification.
- What is a UUID?Learn what UUIDs are, how versions differ (especially v4 vs v7), and how to generate identifiers locally without a server.
- What is Regex?Learn regular expressions—what they are good for, when parsers are safer, and how to test patterns locally without pasting sensitive data.
- What is Base64?Learn Base64 encoding—why APIs use it, how it differs from encryption, and how to encode or decode strings locally in your browser.
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Frequently asked questions
- Do these developer tools upload my code or secrets?
- No. They run in your browser with Web APIs such as Web Crypto and TextEncoder. Sensitive tools like JWT Decoder and Password Generator keep history disabled until you explicitly opt in on this device.
- When should I use a browser tool versus an IDE plugin?
- Use these for quick, one-off tasks—formatting a payload, checking a hash, explaining a cron string—without opening a project. Prefer your IDE for large refactors, versioned workflows, and team-shared configurations.
- Are generated passwords and UUIDs cryptographically sound?
- Password Generator and UUID Generator use browser crypto APIs where available. Treat outputs as helpers for local use, and follow your organization’s secret-handling policy before production deployment.
- Can I decode JWTs without verifying signatures?
- JWT Decoder inspects header and payload claims locally. It does not verify signatures unless a tool explicitly documents verification. Never paste production tokens into shared machines.
- How do I find related tools quickly?
- Each tool page lists related utilities from the same category and tags. Use site search (Ctrl/Cmd+K) to jump by keyword such as base64, uuid, or regex.