Free Developer Tools & Utilities
Essential tools for developers and programmers. Format and beautify code, convert between data formats, test regular expressions, decode tokens, and generate configuration files. All tools run in your browser with no data sent to servers.
All Developer Tools
XML Formatter
Format and prettify XML documents
YAML to JSON Converter
Convert YAML data to JSON format
SQL Formatter
Format and beautify SQL queries
JavaScript Obfuscator
Scramble JS code to protect logic
Regex Tester
Test and debug regular expressions
JWT Decoder
Decode and inspect JWT tokens
Crontab Generator
Generate cron expressions visually
JSON to CSV Converter
Convert JSON arrays to CSV format
HTML Entity Encoder
Convert characters to HTML entities
PHP Serialized Data Viewer
Decode PHP/WordPress serialized data
Epoch Converter
Convert between Unix timestamps and dates
GraphQL Prettifier
Format GraphQL queries for readability
Universal Markdown Converter
Convert Markdown to HTML, PDF, and DOCX privately in your browser
Client-Side Log Analyzer
Open large log files locally, inspect JSON logs, and analyze repeated issues without uploads
Static Site Playground
Run a multi-file Node.js static site sandbox in your browser with terminal output and live preview
Browser-Based File Encryptor
Encrypt files with AES-256 in your browser and unlock them later with the same password
Offline-First Pomodoro & Data Tracker
Run a private Pomodoro timer with local history, daily stats, and offline-first browser storage
Client-Side CSV to SQL
Convert CSV files to SQL scripts and SQLite locally in your browser
Overview
Developer workflows often require quick transformations: formatting JSON, validating regex, decoding tokens, or building cron expressions. This catalog provides a reliable toolbox for debugging, data conversion, and configuration tasks without leaving your browser. Everything runs client-side to protect proprietary code and data.
Developer tasks pile up quickly
Small formatting and validation tasks interrupt deep work and can slow engineering teams. Jumping between IDE plugins and external services introduces friction and inconsistency.
Data interchange formats like JSON, YAML, XML, and CSV often require conversion and cleanup. A dedicated toolkit simplifies this process and reduces errors.
Security is also critical. Decoding tokens or obfuscating code should happen locally to avoid leaking sensitive information.
Catalog Breakdown
Formatting and prettifying
Keep data and code readable with standardized formatting.
- Beautify XML and SQL
- Format GraphQL queries
- Clean up JSON for reviews
Data conversion and extraction
Translate between formats for integration and analysis.
- Convert YAML to JSON
- Transform JSON to CSV
- Decode HTML entities safely
Debugging and validation
Test regex, decode tokens, and parse serialized data.
- Validate regex patterns
- Decode JWT payloads
- Inspect PHP serialized strings
Automation helpers
Support scheduling, timestamps, and code protection workflows.
- Generate cron expressions
- Convert epoch timestamps
- Obfuscate JavaScript snippets
How to Use These Tools
Select the developer task
Choose formatting, conversion, validation, or automation tools.
Paste your data or code
Work directly in the tool to avoid data leaks.
Adjust parameters
Set indentation, delimiters, or validation patterns.
Review and verify output
Check that the transformed data still matches expectations.
Copy the result
Export the output back into your project or pipeline.
Document changes
Note any transformations for team visibility.
Use Cases
API debugging
Format JSON responses and inspect tokens quickly.
Data migrations
Convert YAML to JSON or JSON to CSV for ETL steps.
Regex development
Test complex patterns against sample strings.
Cron scheduling
Build schedules without manual cron syntax errors.
Legacy system support
Decode PHP serialized data for migrations.
Security hygiene
Obfuscate snippets or inspect JWT headers locally.
Professional Applications
Backend engineering
Validate payloads and translate formats in pipelines.
DevOps
Generate cron schedules and analyze timestamps.
Security engineering
Inspect tokens and obfuscate exposed code.
Data engineering
Convert and clean structured data.
QA automation
Validate outputs and compare structured data.
Best Practices
- Validate outputs before pushing them to production.
- Avoid placing secrets in any tooling, even client-side.
- Use consistent formatting rules across your team.
- Document conversions in commit messages or PR notes.
- Test cron schedules in a staging environment first.
- Use JSON or YAML schemas when available to validate structure.
- Remember that obfuscation is not encryption.
FAQs
Is my code uploaded to servers?
No. All processing is client-side.
Can I use these tools for large files?
Yes, but performance depends on your device and file size.
Are these tools safe for production secrets?
They do not transmit data, but you should still avoid exposing secrets unnecessarily.
Is JavaScript obfuscation a security feature?
Obfuscation adds friction but is not a substitute for real security controls.
Do formatters change semantics?
They only adjust formatting, not logic.
Can I trust the conversions?
Conversions use deterministic parsing rules based on standard formats.
Do the tools support modern syntax?
They support common, modern versions of each format.
Can I export results?
Yes. Copy results directly into your codebase or data files.