10 Free Developer Tools You Need in 2026 — No Signup Required

📋 What it does

Paste messy JSON and instantly get formatted, syntax-highlighted output. Validates structure, sorts keys alphabetically, and can minify for production use.

Key features:

• Pretty-print with configurable indentation
• Syntax error detection with line numbers
• One-click minification
• Key sorting for diff-friendly output
• Tree view for nested structures

Common use case: You get a blob of JSON from an API response. Paste it in, instantly see the structure, find the nested field you need.

Try JSON Formatter →

🔓 What it does

Paste a JWT token and instantly see the decoded header, payload, and expiration status. No libraries needed — works entirely in-browser.

Key features:

• Decode header and payload sections
• Show token expiration time and status
• Display all standard claims (iss, sub, aud, exp, iat)
• Sample tokens for testing
• Copy decoded sections

Common use case: Debugging auth issues. Is the token expired? Does it have the right claims? Paste and check in 2 seconds.

Try JWT Decoder →

🔤 What it does

Write regular expressions with real-time match highlighting. See capture groups, test against sample text, and use the built-in cheatsheet.

Key features:

• Real-time match highlighting as you type
• Capture group extraction and display
• Flag toggles (global, case-insensitive, multiline)
• Preset patterns (email, URL, IP address, etc.)
• Comprehensive regex cheatsheet

Common use case: Building a validation pattern for email or phone numbers. Test it live against real examples before putting it in code.

Try Regex Tester →

🔒 What it does

Generate cryptographic hashes using SHA-1, SHA-256, SHA-384, or SHA-512. Compare two hashes to verify file integrity.

Key features:

• Multiple algorithms: SHA-1, SHA-256, SHA-384, SHA-512
• Side-by-side hash comparison
• Instant generation as you type
• One-click copy to clipboard

Common use case: Verifying a downloaded file's checksum matches what the publisher listed. Or generating a SHA-256 hash for an API signature.

Try Hash Generator →

🔐 What it does

Encode text to Base64 or decode Base64 strings back to text. Supports URL-safe encoding and file encoding.

Key features:

• Standard and URL-safe Base64
• Encode and decode modes
• Handle multi-line text
• Character count and size display

Common use case: Encoding credentials for a Basic Auth header, or decoding a Base64 blob from an API response.

Try Base64 Encoder →

🔑 What it does

Generate UUID v4 identifiers in single or bulk mode. Multiple output formats available.

Key features:

• Single UUID or batch generation (up to 100)
• Standard, no-dash, and uppercase formats
• One-click copy
• Cryptographically random using Web Crypto API

Try UUID Generator →

⏰ What it does

Build cron expressions with a visual interface. Get plain-English descriptions and preview the next scheduled runs.

Key features:

• Visual field builder with dropdowns
• Human-readable descriptions
• Next 5 run time preview
• Quick preset buttons (every minute, hourly, daily, weekly)
• Supports both 5-field and 6-field cron formats

Common use case: Setting up a cron job but can never remember the syntax. Pick your schedule visually and copy the expression.

Try Cron Builder →

🔗 What it does

Encode and decode URLs with a clear explanation of when to use encodeURI vs encodeURIComponent.

Key features:

• Full URI encoding and component encoding
• Side-by-side comparison of encoding modes
• Special character reference table
• Auto-detect and decode percent-encoded strings

Try URL Encoder →

💡 What it does

A curated collection of effective prompts for ChatGPT, Claude, and other AI assistants. Organized by category with one-click copy.

Categories:

• Code generation and debugging
• Writing and editing
• Data analysis
• Creative tasks
• Business and marketing

Browse Prompts →

📊 What it does

Paste any AI prompt and get a quality score. Evaluates clarity, specificity, context, and actionability.

What it checks:

• Clarity: Is the intent obvious?
• Specificity: Are constraints and details provided?
• Context: Is background information included?
• Actionability: Can the AI act on it directly?

Try Prompt Grader →