Home/Developer Tools

Developer Utilities

Free Developer Tools

Fast local utilities for formatting, encoding, decoding, validating, hashing, testing, and generating common developer outputs.

{} JSON Formatter

Format, validate, minify and download JSON.

{ } Base64 Encoder / Decoder

Encode and decode Base64 text locally.

🔗 URL Encoder / Decoder

Encode and decode URLs and URI components.

# Hash Generator

Generate SHA hashes and checksums from text.

.* Regex Tester

Test regex patterns and replacement previews.

⏲️ Cron Expression Builder

Build and explain cron expressions.

🔑 JWT Decoder

Decode JWT header, payload and common claims locally.

< HTML Entity Encoder

Encode and decode HTML entities safely.

🌈 CSS Gradient Generator

Create CSS gradients with live previews.

Why use browser developer tools?

Browser-powered developer tools are useful for quick debugging, formatting and testing without installing packages or sending simple inputs to a server.

FAQ

Do these developer tools upload my code?

Many ToolNest developer tools run locally in your browser and do not upload your input.

Can I use these for production work?

Yes for utility tasks, but always review outputs before using them in production projects.