💻 Developer & Data
Format and validate JSON, XML, YAML and SQL, test regex and cron, encode data, and handle security, IDs and networking — all client-side in your browser.
42 free tools across 4 categories.
Data Formats & Validation (17 tools)
CSV ↔ JSON Converter
CSV ↔ JSON converter. Smart parsing with PapaParse.
JSON Compare
Compare two JSON objects. Find added/removed/changed keys.
JSON Escape / Unescape
Escape and unescape JSON strings. Convert special chars to JSON-safe sequences. Decode escaped strings.
JSON Formatter & Validator
Format, validate, minify JSON. Error line detection.
JSON Minifier
Minify and compress JSON. Strip whitespace, reduce file size. Size comparison stats.
JSON Schema Generator
Generate JSON Schema from JSON. Auto-detects types.
JSON to CSV Converter
Convert JSON to CSV instantly. Paste JSON and get clean CSV output. Free, browser-based, zero-dependency.
JSON to SQL Converter
Convert JSON to SQL INSERT/CREATE TABLE statements. MySQL, PostgreSQL, SQLite, MSSQL. Nested flattening.
JSON ↔ YAML Converter
Convert JSON to YAML and YAML to JSON. js-yaml powered, bidirectional. Handles nested objects and arrays.
JSONPath Tester
Evaluate JSONPath queries. Select data from JSON.
SQL Formatter
Format SQL. MySQL, PostgreSQL, SQLite. Beautify/minify.
SQL to JSON Converter
Convert SQL CREATE TABLE + INSERT to JSON. Multi-dialect, big-int safe.
XML Formatter & Validator
Format & validate XML. DOMParser error detection.
XML ↔ JSON Converter
Bidirectional XML ↔ JSON conversion. Recursive mapping.
XPath Tester & Evaluator
Test and evaluate XPath expressions against XML documents instantly. Query XML nodes with XPath 1.0, view results with generated paths. Free, browser-based, zero-dependency.
XSD Generator & Validator
Generate XSD schema from XML, or validate XML against XSD. Zero-dependency, browser-based.
YAML Validator
Validate YAML, convert to JSON. Error line detection.
Security & Network (10 tools)
HTTP Header Checker
Check HTTP response headers for any URL. View status, security, cache headers. Free developer tool.
Hash Generator
SHA-256, SHA-1, SHA-512. Web Crypto API.
IP Subnet Calculator
Calculate subnet details from IP + mask. Network, broadcast, usable hosts, wildcard mask. IPv4.
JWT Decoder
Decode JWT tokens. View header, payload, expiration.
Password Generator
Generate strong, random passwords. Configurable length.
Password Strength Checker
Entropy score, crack time, improvement tips.
SSH Key Generator
Generate SSH key pairs. RSA, ECDSA. PEM format.
SSL Certificate Decoder
Decode SSL/X.509 certificates. View Subject, Issuer, Validity, Fingerprint, Public Key. Free developer tool.
Text Encryptor / Decryptor
AES-256-GCM encryption. Password-protected messages.
What Is My IP Address
Check your public IPv4 & IPv6, ISP, and location instantly.
Code & Build Helpers (9 tools)
Cron Expression Builder
Visual cron builder. Human-readable. Presets included.
Dockerfile & Docker Compose Generator
Generate Dockerfile and compose files for Node, Python, Go, Java. Pick DB, ports, env vars. No Docker experience needed.
Function Graph Plotter
Math function graphing. sin, cos, x², multi-function.
JSON to Java POJO/DTO Converter
Convert JSON to Java POJO classes with Lombok, Jackson, nested objects. Free online converter, no sign-up.
JSON to TypeScript Generator
Convert JSON to TypeScript interfaces, types, and enums. Optional readonly, strict null checks.
Regex Explainer
Translate regex to human language. Token-by-token explanation.
Regex Tester
Test regex in real-time. Highlight matches, groups.
Scientific Calculator
Trig, log, sqrt, power. Expression input with history.
cURL to Code Converter
Convert curl commands to Python, Node.js, and Java code. Parse -X, -H, -d flags. Free developer tool.
Encoding & IDs (6 tools)
Base64 Encoder & Decoder
Encode and decode Base64 strings. Essential developer utility.
HTML Entity Encoder & Decoder
Encode/decode HTML entities. XSS prevention.
Number Base Converter
Binary, octal, decimal, hex. Real-time conversion.
URL Encoder & Decoder
Encode/decode URL strings. Percent-encoding tool.
UUID Generator
Generate UUID v4 identifiers. Browser crypto API.
Unix Timestamp Converter
Convert Unix timestamps to dates and back. Bidirectional.