15+ Tools
100% Free
๐ŸŒณ

JSON Tree Visualizer

Visualize JSON as an interactive tree structure with collapsible nodes

INPUT JSON
TREE VIEW
๐Ÿ”

JWT Decoder

Decode and inspect JSON Web Tokens with expiration checking

JWT TOKEN
DECODED PAYLOAD
๐ŸŽฏ

Regex Debugger

Test and debug regular expressions with real-time matching

REGEX PATTERN
/ /
TEST STRING
MATCHES 0 matches
๐Ÿ—„๏ธ

SQL Formatter

Format and beautify SQL queries with syntax highlighting

INPUT SQL
FORMATTED SQL
๐Ÿ“ธ

Code Screenshot Generator

Create beautiful code images for social media and documentation

CODE INPUT
PREVIEW

                            
๐Ÿ“Š

Text Diff Checker

Compare two texts and highlight differences

ORIGINAL TEXT
MODIFIED TEXT
๐ŸŽจ

Color Palette Generator

Generate beautiful color palettes and check contrast ratios

BASE COLOR
CONTRAST CHECKER
โฐ

Cron Expression Builder

Build and understand cron expressions with visual preview

BUILD CRON
EXPRESSION
0 * * * *
NEXT EXECUTIONS
COMMON PRESETS

Every Hour

0 * * * *

Daily at Midnight

0 0 * * *

Weekly on Sunday

0 0 * * 0

Monthly on 1st

0 0 1 * *

๐Ÿ•

Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates

CURRENT TIMESTAMP
CONVERT
๐Ÿ”ข

Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes

INPUT TEXT
HASH OUTPUT
๐Ÿค–

AI Developer Tools

Essential tools for AI/ML development and prompt engineering

๐Ÿ’ฌ Prompt Optimizer

Optimize and improve your AI prompts for better results

๐ŸŽซ Token Counter

Count tokens for OpenAI, Claude, and other LLMs

๐Ÿ“‹ JSON Schema Generator

Generate JSON Schema from sample data for Function Calling

๐ŸŽฏ Regex Generator

Generate regular expressions from natural language

๐Ÿ“ Text Tools

Word counter, character count, reading time calculator

๐ŸŽจ Color Palette Generator

Generate harmonious color palettes from base color

๐Ÿ’ฌ

Prompt Optimizer

Transform vague prompts into effective, structured instructions

YOUR PROMPT
OPTIMIZED PROMPT
๐ŸŽซ

Token Counter

Count tokens and estimate API costs for OpenAI, Claude, and more

INPUT TEXT
TOKEN ANALYSIS
PRICING REFERENCE
GPT-4o
Input: $2.50 / 1M tokens
Output: $10.00 / 1M tokens
GPT-4o-mini
Input: $0.15 / 1M tokens
Output: $0.60 / 1M tokens
Claude 3.5 Sonnet
Input: $3.00 / 1M tokens
Output: $15.00 / 1M tokens
Llama 3.1 70B
Input: $0.88 / 1M tokens
Output: $0.88 / 1M tokens
๐Ÿ“‹

JSON Schema Generator

Generate JSON Schema from sample data for OpenAI Function Calling

SAMPLE JSON
JSON SCHEMA
๐ŸŽฏ

Regex Generator

Generate regular expressions from natural language descriptions

DESCRIPTION
COMMON PATTERNS

๐Ÿ“ง Email Address

^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$

๐Ÿ“ฑ Phone Number (US)

^\\(?\\d{3}\\)?[-.\\s]?\\d{3}[-.\\s]?\\d{4}$

๐Ÿ”— URL

^https?:\\/\\/[\\w\\-]+(\\.[\\w\\-]+)+[\\/\\w\\-.~:/?#[\\]@!$&'()*+,;=%]*$

๐ŸŒ IPv4 Address

^((25[0-5]|2[0-4]\\d|[01]?\\d\\d?)\\.){3}(25[0-5]|2[0-4]\\d|[01]?\\d\\d?)$

๐Ÿ“… Date (YYYY-MM-DD)

^\\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12]\\d|3[01])$

๐ŸŽจ Hex Color

^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$

GENERATED PATTERN
๐Ÿ“

Text Analysis Tools

Word count, character count, reading time, and text statistics

INPUT TEXT
ANALYSIS RESULTS
๐ŸŽจ

Color Palette Generator

Generate harmonious color palettes from a base color

BASE COLOR
GENERATED PALETTE
โ„น๏ธ

About DevTools Hub

Professional developer tools for everyone

Welcome to DevTools Hub

DevTools Hub is a free collection of professional developer tools designed to boost your productivity. Whether you're a seasoned developer or just starting out, our tools help you work faster and smarter.

Our Mission

We believe developer tools should be fast, free, and easy to use. No sign-ups required, no ads cluttering your workspace โ€” just pure utility at your fingertips.

Features

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Legal

Please review our Privacy Policy and Terms of Service.

๐Ÿ”’

Privacy Policy

Last updated: June 2026

Privacy Policy for DevTools Hub

Introduction

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๐Ÿ“‹

Terms of Service

Last updated: June 2026

Terms of Service for DevTools Hub

1. Acceptance of Terms

By accessing and using DevTools Hub (the "Service"), you accept and agree to be bound by the terms and provision of this agreement. If you do not agree to these terms, please do not use our Service.

2. Description of Service

DevTools Hub provides a collection of free online developer tools including but not limited to:

  • JSON formatting and visualization tools
  • Code screenshot generation
  • Text diff comparison
  • Color palette generation
  • AI prompt optimization tools
  • Various encoding/decoding utilities

3. User Responsibilities

You are responsible for:

  • Ensuring your use of the Service complies with applicable laws
  • Maintaining the confidentiality of any data you process using our tools
  • Not using the Service for any illegal or unauthorized purpose

4. Intellectual Property

The Service and its original content, features, and functionality are owned by DevTools Hub and are protected by international copyright, trademark, patent, trade secret, and other intellectual property laws.

5. Data Processing

All data processing occurs locally in your browser. We do not store, transmit, or have access to any data you input into our tools. You retain full ownership and responsibility for your data.

6. Disclaimer of Warranties

The Service is provided "as is" and "as available" without warranties of any kind, whether express or implied, including but not limited to implied warranties of merchantability, fitness for a particular purpose, or non-infringement.

7. Limitation of Liability

In no event shall DevTools Hub be liable for any indirect, incidental, special, consequential, or punitive damages resulting from your use of or inability to use the Service.

8. Changes to Terms

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9. Contact Information

For any questions about these Terms of Service, please contact us at legal@devtoolshub.com.

โœ‰๏ธ

Contact Us

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SEND US A MESSAGE
CONTACT INFORMATION

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