Developer Tools
Free online developer tools for coding, debugging, and data processing. JSON formatters, encoders, decoders, validators, converters, testers, and generators — everything a developer needs in one place.
Developer utilities for regex testing, JSON/XML/SQL formatting and validation, JSONPath queries, YAML conversion, JSON comparison, SSH key generation, UUID generation, AI prompt building, and Dockerfile generation. All tools process locally with instant results. Key tools: Regex Tester with explainer, JSON Formatter with schema validation, SSH Key Generator (RSA/Ed25519), JWT Decoder.
How to Choose the Right Developer Tool
JSON and Data Format Tools
| Goal | Best Tool | Why |
|---|---|---|
| Compress JSON for production | JSON Minifier | Strips whitespace, shows size savings |
| Generate JSON Schema | JSON Schema Generator | Infers schema from sample JSON |
| Compare two JSON files | JSON Compare | Side-by-side diff with highlighting |
| Query JSON with path expressions | JSONPath Tester | Test JSONPath queries in real time |
| Convert JSON to Java classes | JSON to Java POJO | Generates typed Java class files |
| Convert CSV to JSON | CSV to JSON Converter | Bidirectional CSV and JSON conversion |
| Format and validate XML | XML Formatter | Indent, validate, and beautify XML |
| Convert XML to JSON | XML to JSON Converter | Bidirectional XML and JSON |
| Validate YAML syntax | YAML Validator | Syntax check with error highlighting |
Encoding and Text Tools
| Goal | Best Tool | Why |
|---|---|---|
| Encode/decode Base64 | Base64 Encoder | Binary to text, Base64URL variant |
| Encode/decode URLs | URL Encoder | Percent-encode query parameters |
| Escape HTML characters | HTML Entity Encoder | Prevent XSS, embed code in pages |
| Compare text differences | Text Diff Checker | Line-by-line comparison with highlights |
| Change text case | Case Converter | Upper, lower, title, camel, snake case |
| Convert number bases | Number Base Converter | Binary, hex, octal, decimal |
Dev Utilities
| Goal | Best Tool | Why |
|---|---|---|
| Test regex patterns | Regex Tester | Real-time matching with group display |
| Understand a regex | Regex Explainer | Breaks patterns into plain English |
| Format SQL queries | SQL Formatter | Beautify SQL, multi-dialect support |
| Decode JWT tokens | JWT Decoder | Header and payload inspection |
| Generate UUIDs | UUID Generator | Cryptographically random v4 UUIDs |
| Convert Unix timestamps | Timestamp Converter | Unix time to human-readable, and back |
| Generate Dockerfiles | Dockerfile Generator | Interactive Dockerfile creation |
| Check public IP address | What Is My IP | IPv4, IPv6, ISP, and location |
All tools run client-side — your code and data never leave your browser.
Essential Developer Utilities
ToolStand developer tools cover the daily tasks that slow down development workflows: formatting and validating JSON, encoding and decoding Base64, converting between data formats, testing regular expressions, generating UUIDs, decoding JWTs, and much more. Each tool is optimized for speed — paste your data, get results instantly, and move on. No server round-trips, no API keys, no waiting.
Why Browser-Based Developer Tools?
Command-line tools are powerful but require context switching — open a terminal, remember the syntax, pipe output. Browser-based tools are always available in a tab next to your code editor. They work on any device, require no installation, and handle edge cases gracefully. For quick one-off tasks like "format this JSON blob" or "decode this JWT token," opening a browser tool is faster than writing a script or looking up CLI flags.
Data Privacy for Developers
Many online developer tools upload your data to a server for processing. That means potentially sensitive code, API keys embedded in JSON, or proprietary data structures are sitting on someone else machine. ToolStand developer tools process everything client-side. Your data stays in your browser — zero uploads, zero server processing. This is especially important when working with production data, authentication tokens, or proprietary algorithms.
All Developer Tools on ToolStand
- JSON Formatter & Validator — Format, validate, and minify JSON with error line detection and color-coded output.
- JSON Minifier — Compress JSON by stripping whitespace. Size comparison stats before and after.
- JSON Schema Generator — Auto-generate JSON Schema from JSON data with type detection.
- HTTP Header Checker — Check HTTP response headers for any URL. View status, security, cache headers. Free developer tool.
- JSON Compare — Semantic JSON comparison — find added, removed, and changed keys at any nesting level.
- JSON to TypeScript Converter — Convert JSON to TypeScript interfaces and types with optional readonly and partial support.
- JSONPath Tester — Evaluate JSONPath queries against JSON data with instant match highlighting.
- JSON to Java POJO Converter — Convert JSON to Java classes with Lombok, Jackson annotations, and nested object support.
- Base64 Encoder & Decoder — Bidirectional Base64 encoding and decoding with Base64URL variant support.
- JWT Decoder — Decode JWT tokens to inspect headers, payloads, and expiration times.
- SSH Key Generator — Generate RSA and Ed25519 SSH key pairs. Copy public/private keys instantly. Free developer tool.
- Unix Timestamp Converter — Convert between Unix timestamps and human-readable dates bidirectionally.
- URL Encoder & Decoder — Encode and decode URL strings with percent-encoding for safe query parameters.
- HTML Entity Encoder — Encode/decode HTML entities for safe web content and XSS prevention.
- UUID Generator — Generate cryptographically random UUID v4 identifiers.
- Regex Tester — Test regular expressions in real time with match highlighting and group display.
- Regex Explainer — Translate regex patterns into human-readable explanations token by token.
- Text Diff Checker — Compare two texts side by side with color-coded LCS diff.
- SSL Certificate Decoder — Decode X.509 certificates. View Subject, Issuer, Validity, Fingerprint. Free developer tool.
- Case Converter — Convert text between 8 formats: UPPER, lower, camelCase, snake_case, and more.
- Number Base Converter — Convert between binary, octal, decimal, and hexadecimal in real time.
- Color Contrast Checker — Check WCAG color contrast ratios for AA/AAA compliance. Free, instant, no upload.
- CSV to JSON Converter — Bidirectional CSV and JSON conversion with PapaParse smart parsing.
- cURL to Code Converter — Convert curl commands to Python, Node.js, and Java code instantly.
- XML Formatter & Validator — Format and validate XML with DOMParser error detection.
- XML to JSON Converter — Bidirectional XML and JSON conversion with recursive mapping.
- YAML Validator — Validate YAML syntax and convert to JSON with line-level error detection.
- SQL Formatter — Beautify and minify SQL for MySQL, PostgreSQL, and SQLite.
- SQL to JSON Converter — Convert SQL dump files (CREATE TABLE + INSERT) to structured JSON.
- IP Subnet Calculator — IPv4 subnet details. Network, broadcast, CIDR, wildcard. Free.
- Dockerfile Generator — Generate Dockerfile and Docker Compose files for Node, Python, Go, and Java projects.
- What Is My IP — Check your public IPv4, IPv6, ISP, and location instantly.
Frequently Asked Questions
JSON Formatter vs JSON Minifier — when should I use each?
Use the JSON Minifier to compress JSON for production (strips whitespace, reduces file size). Use JSON formatting tools when you need to read or debug JSON — the XML Formatter and JSON tools make nested data human-readable with indentation and syntax highlighting. Minify for deployment, format for development.
Which encoding tool should I use — Base64, URL Encode, or HTML Entity?
Each serves a different purpose: Base64 Encoder converts binary data to ASCII text (images in CSS, API authentication tokens). URL Encoder makes text safe for query strings (spaces become %20, special characters escaped). HTML Entity Encoder escapes characters for HTML safety (< becomes <). Use Base64 for data transport, URL Encode for web addresses, HTML Entity for embedding code in pages.
Is the Regex Tester a real regex engine?
Yes. The Regex Tester uses JavaScript's built-in RegExp engine — the same one that powers client-side form validation and text processing in the browser. It supports flags (g, i, m), capture groups, and real-time match highlighting. The companion Regex Explainer breaks down complex patterns into plain English, showing what each token matches. Both are ideal for learning and debugging regular expressions.
Can these tools handle large files and is my code safe?
All tools run entirely in your browser using client-side JavaScript — your code, JSON, and data never leave your device. The Text Diff Checker and JSON Compare process files locally via the File API. For very large files (50MB+), browser memory limits apply — these are lightweight utilities, not enterprise ETL tools. The SQL Formatter and YAML Validator handle typical development workloads comfortably.
What does the JWT Decoder do — can it verify token signatures?
The JWT Decoder decodes the header and payload of JSON Web Tokens — it shows you what's inside the token (issuer, subject, expiration, custom claims). It does NOT verify cryptographic signatures (HS256/RS256). For signature verification, use a server-side library. The decoder is useful for debugging tokens during development and understanding what data your auth system is transmitting.
Do these developer tools work offline?
Yes. The UUID Generator, Timestamp Converter, What Is My IP (see your public IP via external API), and Dockerfile Generator are all client-side tools. Most work offline after the first visit thanks to service worker caching. For tools that need external data (IP lookup, currency rates), a network connection is required on first use.