Developer Tools
Format SQL, format JSON, decode JWT tokens, generate UUIDs, encode base64 text, and test regular expressions in-browser securely.
Category AI Summary & Takeaways
A collection of software developer utilities for encoding, formatting, parsing, and testing data formats securely without server-side leaks.
- No developer keys or credentials are sent over the network.
- Fast formatting and parsing of JSON, SQL, JWT, and Base64.
- UUID generators run locally using crypto API.
Browse All Developer Tools
Free JSON Formatter & Validator Online
Beautify, validate, and minify JSON structures locally.
Free Base64 Encoder/Decoder Online
Encode binary or text files into Base64 format and decode them back.
Free JWT Decoder Online
Inspect JSON Web Tokens (JWT) payload, headers, and signatures locally.
Free Text Diff Checker Online
Compare text blocks side-by-side to highlight line-by-line differences.
Free Hash Generator Online
Compute MD5, SHA-1, SHA-256, and SHA-512 hashes in your browser.
Free SQL Formatter Online
Beautify and indent SQL queries with custom indentation levels.
Free XML to JSON Online
Convert XML data structures into clean JSON objects in memory.
Free RegEx Tester Online
Test regular expressions with syntax highlights and match breakdowns.
Free HTML Entity Encoder Online
Encode special characters to HTML entities and decode them back.
Free UUID Generator Online
Bulk generate cryptographically secure UUID v4 tokens locally.
Knowledge Center & Overview
Topic Overview
Engineering diagnostics often involve handling sensitive secrets, database records, and authentication payloads. Pasting proprietary configs or JWT authorization headers into cloud formatters is a major compliance risk. ToolsAtZero Developer Tools resolve format strings, token decodings, and UUID parameters locally, preventing leaks.
Beginner's Guide
Choose a formatting utility, paste your JSON or SQL query into the edit canvas, customize spacing parameters, and immediately retrieve the formatted copy. JWT decoders present header, payload, and signature values in separate panels on input change.
Recommended Workflow
- Validate code block formatting using JSON validators.
- Strip developer keys before staging codes.
- Generate clean UUID parameters for test DB records.
Common Problems & Gotchas
- Syntax errors in raw data payloads can prevent correct formatting outputs.
- Invalid JSON formatting (e.g. single quotes) will trigger validation alarms.
Practical Use Cases
- Inspecting active JWT bearer tokens to view payload details during API debugging.
- Beautifying obfuscated JSON error configs or API responses.
- Generating multiple secure UUID v4 tokens for database seeds.
Industry Applications
- Software Engineering: Debugging API outputs and database logs.
- Security Audits: Inspecting base64 headers and authorization credentials.
- System Administration: Generating mock configs.
Glossary of Terms
Related Guides
Format Comparisons
Frequently Asked Questions
Q: Can I decode sensitive JWT tokens safely?
Yes. The JWT decoder splits the token signature locally. No tokens are sent over the network.
Q: Is the SQL formatter compliant with standard dialets?
Yes, it formats standard SQL syntax locally inside your browser.