Developer Tools
Developer utilities and debugging tools
Why Developer Tools Matter
Developer tools should reduce friction in the middle of debugging, not force you into a separate research project. This category is strongest when it helps you move from a broken payload or unreadable query to a clean, inspectable result in seconds.
The priority pages here are centered on API and backend work: SQL cleanup, JSON inspection, token decoding, and protocol reference tasks that developers repeat constantly.
Best tools to start with
Curated entry points for the strongest developer workflows.
SQL Formatter
Format and beautify SQL queries.
JSON Tree Viewer
Visualize JSON data in an interactive tree structure.
JWT Decoder
Decode and inspect JSON Web Tokens (JWT) without validation.
JSON Path Tester
Test JSONPath expressions against your JSON.
JSON to TypeScript Interface
Convert any JSON object into TypeScript interfaces instantly — handles nested objects, arrays, union types, optional fields, and generics.
HTTP Status Code Reference
Searchable reference for all HTTP status codes — with meaning, common causes, and fix recommendations.
Developer Tool Collections
Grouped workflows that connect developer tools to adjacent tasks.
API & Backend Pack
The developer tools you open every day: JWT decoder, JSON formatter, HTTP status codes, cron builder, SQL formatter, and more.
Security & Privacy Kit
Password generators, strength checkers, hash functions, and token decoders — all running entirely in your browser, never touching a server.
Developer Guides & Posts
In-depth guides and tips for getting the most out of developer tools.
Developer FAQ
Common questions about developer tools and how to use them.
Which developer tools should most users start with?
SQL Formatter, JSON Formatter, JSON Tree Viewer, JWT Decoder, and JavaScript or HTML beautifiers cover the most common debugging and inspection jobs for web developers.
Why are some related tools in other categories?
Real workflows cross category boundaries. A backend debugging session often touches converter, security, and generator tools, so the category hub intentionally links across those boundaries.
Are these tools safe for private payloads or internal code snippets?
Most of the core developer tools on WebToolsPlanet run locally in the browser, which is useful when you are inspecting tokens, JSON payloads, or messy code that should not be pasted into a server-backed app.
All Developer tools
23 free tools — no sign-up required.
JWT Decoder
Decode and inspect JSON Web Tokens (JWT) without validation.
Cron Expression Generator
Build and decode cron schedule expressions visually — get human-readable descriptions and next run times.
HTTP Status Code Reference
Searchable reference for all HTTP status codes — with meaning, common causes, and fix recommendations.
User Agent Parser
Decode any User-Agent string — identify browser, engine, OS, device type, and bot classification.
SQL Formatter
Format and beautify SQL queries.
Unix Timestamp Converter
Convert Unix epoch timestamps to human-readable dates and vice versa — with timezone support.
JSON Path Tester
Test JSONPath expressions against your JSON.
JavaScript Minifier
Compress and minify JavaScript using Terser — with variable mangling, dead-code removal, and size stats.
JavaScript Beautifier
Format and beautify minified or messy JavaScript code.
HTML Minifier
Compress HTML by removing whitespace, comments, and redundant attributes — with size reduction stats.
HTML Beautifier
Format and beautify minified or messy HTML code.
Code to Image Converter
Convert code snippets to beautiful images for sharing.
JSON Tree Viewer
Visualize JSON data in an interactive tree structure.
MD5 Generator
Instantly generate MD5 hashes from any text for checksums and data verification.
SHA Hash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text instantly in your browser.
React Native Shadow Generator
Generate cross-platform React Native shadow styles — iOS shadowColor/shadowOffset and Android elevation in one StyleSheet object.
JSON to TypeScript Interface
Convert any JSON object into TypeScript interfaces instantly — handles nested objects, arrays, union types, optional fields, and generics.
IP Address Lookup
Look up geolocation, ISP, ASN, and timezone data for any IPv4 or IPv6 address — with automatic detection of your current IP.
Regex Visualizer
Visualize regular expressions as interactive railroad diagrams — understand complex patterns with a clear SVG flowchart, live match testing, and flag explanations.
DNS Lookup Tool
Query A, AAAA, MX, TXT, CNAME, NS, and SOA DNS records globally using Cloudflare DoH — for email, SSL, and domain debugging.
Cron Expression Explainer
Translate cron expressions to plain English — see next run times, validate schedules, and learn cron syntax with live examples.
JWT Debugger
Decode, inspect, and verify JSON Web Tokens (JWT) locally.
Webhook Tester
Receive, inspect, and debug incoming webhooks in real-time — see headers, body, query params, and method for any HTTP request sent to your unique endpoint.