Streamline your dev workflow — format JSON, test regex, encode Base64, generate UUIDs, decode JWTs, parse cron expressions, format SQL, and more. All in your browser.
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Convert between JSON and CSV formats
Use tool →Convert between YAML and JSON formats
Use tool →Encode and decode Base64 strings
Use tool →Build and explain cron expressions visually
Use tool →Build and test cron expressions visually with human-readable descriptions and next run times
Use tool →Visual cron expression builder with human-readable explanations
Use tool →Format, validate, and beautify JSON data
Use tool →Decode and inspect JSON Web Tokens
Use tool →Test and debug regular expressions in real-time
Use tool →Format and beautify SQL queries
Use tool →Generate relevant hashtags for Instagram, TikTok, and Twitter to boost engagement
Use tool →Generate unique UUIDs and GUIDs
Use tool →Calculate daily protein, carbs, and fat needs for your fitness goal
Use tool →Generate MD5, SHA-1, SHA-256, and other hashes
Use tool →Step-by-step guide to calculating your macronutrient needs. Learn how to set protein, carbs, and fat targets for weight loss, maintenance, or muscle building.
Read guide →Calculate your daily protein needs based on weight, activity level, and fitness goals. Includes protein-rich food lists, meal timing tips, and common myths debunked.
Read guide →Learn how to calculate your keto diet macros step by step. Understand net carbs, ideal fat-to-protein ratios, fat adaptation, and common keto mistakes to avoid.
Read guide →Master JSON formatting with best practices for syntax, nesting, and validation. Learn common errors, debugging tips, and how to write clean JSON data.
Read guide →NexTool offers 30+ free developer tools including JSON formatter, regex tester, Base64 encoder/decoder, UUID generator, hash generator, cron expression parser, SQL formatter, JWT decoder, YAML converter, and many more.
Yes. All developer tools process data entirely in your browser using client-side JavaScript. Your code, tokens, API keys, and data never leave your device. There is zero server-side processing.
Absolutely. NexTool developer tools handle real-world inputs and edge cases. They are built for daily use by professional developers for formatting, decoding, testing, and debugging tasks.
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