Developer Tools
Essential tools for software developers and engineers. Format JSON, decode JWTs, test regex patterns, encode/decode Base64, format SQL queries, and streamline your workflow.
No sign-up · No data sent to servers · Instant results
JSON Formatter
Format, validate, and beautify JSON data
Use tool →Base64 Encoder/Decoder
Encode and decode Base64 strings
Use tool →Regex Tester
Test and debug regular expressions in real-time
Use tool →URL Encoder/Decoder
Encode and decode URL strings
Use tool →Cron Expression Builder
Build and explain cron expressions visually
Use tool →JWT Decoder
Decode and inspect JSON Web Tokens
Use tool →HTML Entity Encoder/Decoder
Encode and decode HTML entities
Use tool →SQL Formatter
Format and beautify SQL queries
Use tool →Hex Color Picker
Pick colors with HEX, RGB, HSL output and WCAG contrast checker
Use tool →CSS Gradient Generator
Create beautiful CSS gradients with a visual editor — linear, radial, and conic
Use tool →Cron Expression Generator
Build and test cron expressions visually with human-readable descriptions and next run times
Use tool →Frequently Asked Questions
What developer tools does NexTool provide?▾
NexTool provides essential developer tools such as JSON formatter, Base64 encoder/decoder, JWT decoder, regex tester, SQL formatter, and more. All tools are free and require no installation.
Do these developer tools send my code to a server?▾
No. All developer tools process data entirely in your browser. Your code, tokens, and data never leave your device, ensuring complete privacy.
Can I use NexTool developer tools for production work?▾
Yes. NexTool developer tools are built with accuracy and reliability in mind. They handle real-world inputs and edge cases, making them suitable for day-to-day development tasks.
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