Developer tools for practical engineering workflows

JSON Viewer & Formatter

Validate, format, minify, and inspect JSON with a readable tree view in one place.

Regex Tester, Generator & Explainer

Test regex patterns, inspect capture groups, generate suggested patterns, and explain regex token-by-token in plain language.

Base64 Encode/Decode

Encode plain text to Base64 or decode Base64 to text.

Network Tools

UUID Generator & Inspector

Generate UUID v1, v4, and v7 values or inspect existing UUIDs to identify version, variant, and canonical format.

JWT Decoder & Inspector

Decode JWTs, inspect claims, interpret token timing, and verify HS256/HS384/HS512 signatures.

Markdown Editor & Live Preview

Write markdown with live preview, GitHub-style formatting, code highlighting, TOC, and export actions.

URL Encode/Decode

Encode or decode URL components with safe error handling.

Query String Parser

Parse URL query strings into readable key-value JSON.

Date & Time Tools

Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and back.

Date & Time Tools

Timezone Converter

Convert date-time values between IANA timezones.

JavaScript Formatter

Format JavaScript code with readable spacing and line breaks.

HTML Formatter

Beautify HTML markup with indentation and line breaks.

CSS Formatter

Format CSS rules with consistent spacing and indentation.

SQL Formatter

Format SQL queries into readable multi-line statements.

Password Generator

Generate secure random passwords with customizable options.

SHA256 Hash Generator

Generate SHA-256 hashes in your browser.

Text Diff Checker

Compare two text blocks with Git-style unified and split diff views, including inline change highlights.

JSON Minifier

Minify JSON safely by parsing first, then removing whitespace without changing data structure.

JSON to YAML Converter

Convert valid JSON into readable YAML for config files, documentation, and DevOps workflows.

YAML to JSON Converter

Parse YAML and convert it to formatted JSON for API payloads, scripts, and application data models.

JSON to TypeScript

Generate TypeScript interfaces and types from JSON input for faster model scaffolding.

Slug Generator

Convert text into clean URL-friendly slugs for routes, posts, and identifiers.

Remove Extra Spaces

Normalize repeated spaces and tabs while preserving line breaks by default.

Text Case Converter

Convert text into upper, lower, title, camel, snake, and kebab case.

Data Tools Text Tools Encoding & Conversion Tools Date & Time Tools Security Tools Network Tools

Online Developer Tools

A practical toolbox with 60+ tools in 10 categories

Developer Toolbox provides clear, browser-based utilities for JSON processing, Regex testing, Markdown workflows, JWT inspection, UUID generation, network checks, and conversion tasks.

Use this site when you need reliable output without spinning up a full IDE workflow.

Browse focused category collections to move faster through common engineering tasks.

Category collections

Extra resources

Explore all tools Examples Learn guides Regex examples Converter hub

Featured Tools

Popular tools from a broader developer toolbox

Start with six high-utility picks, then explore 60+ tools across 10 categories.

Explore all tools

JSON Viewer & Formatter

Validate, format, minify, and inspect JSON with a readable tree view in one place.

Regex Tester, Generator & Explainer

Test regex patterns, inspect capture groups, generate suggested patterns, and explain regex token-by-token in plain language.

Base64 Encode/Decode

Encode plain text to Base64 or decode Base64 to text.

Network Tools

UUID Generator & Inspector

Generate UUID v1, v4, and v7 values or inspect existing UUIDs to identify version, variant, and canonical format.

JWT Decoder & Inspector

Decode JWTs, inspect claims, interpret token timing, and verify HS256/HS384/HS512 signatures.

Markdown Editor & Live Preview

Write markdown with live preview, GitHub-style formatting, code highlighting, TOC, and export actions.

Explore all tools Examples Regex examples Converter hub Learn

Browse tools by category

Explore focused categories including JSON/Data, Regex/Text, Markdown/Formatting, JWT/Security, Date & Time, Network/Web, Encoding, and UI tools.

Explore all tools

Quick category links

Data Tools

Format, validate, and convert structured data like JSON and YAML directly in your browser.

6 tools

Encoding & Conversion Tools

Convert and encode values like Base64, binary, hex, ASCII, URLs, and query strings for safe transport and parsing.

9 tools

Security Tools

Inspect JWT tokens, generate strong passwords, and create SHA256 hashes using browser-first utilities.

3 tools

Text Tools

Analyze and transform plain text with regex testing, diff checking, case conversion, and duplicate removal.

6 tools

Formatting Tools

Format SQL, HTML, CSS, JavaScript, and Markdown for cleaner code and faster debugging.

5 tools

Date & Time Tools

Convert timestamps, compare timezones, and parse cron expressions for scheduling workflows.

7 tools

Network Tools

Run network diagnostics like ping, DNS, redirects, SSL checks, sitemap checks, and website status in one place.

11 tools

UI Tools

Create, convert, and preview CSS-friendly colors and visual styles like gradients, shadows, and border radius.

5 tools

Web Tools

Parse URLs, inspect headers and user agents, build request URLs, and understand redirect behavior.

4 tools

Developer Tools

Generate and test common developer patterns including cron schedules, regex patterns, JSON paths, and JWT structures.

7 tools