Developer Tools Directory
Explore our complete suite of browser-native developer utilities. Local processing, documented engines and standards, and offline access after the cache finishes installing.
Data & JSON
Format, pretty print, minify, and validate JSON documents with exact line and column syntax error pointers.
JSON.parse / JSON.stringify (browser native) YAML 1.2 JSON ↔ YAML ↔ CSV ConverterBidirectional conversion between JSON, YAML, and CSV formats powered by locally bundled js-yaml.
js-yaml 4.1.0 (bundled locally) RFC 8259 JSON Diff & ComparisonCompare two JSON documents structurally with color-coded key additions, removals, modifications, and deep JSON path tracking.
Recursive AST object comparator (browser native) TypeScript 5.x grammar JSON → TypeScript GeneratorGenerate clean, idiomatic TypeScript interface and type definitions from JSON data with nested types and nullable inference.
Client-side type inference engine JSON Schema Draft-07 JSON Schema ValidatorValidate JSON payloads against JSON Schema specifications with exact error paths, keyword mismatches, and schema diagnostics.
Client-side JSON Schema validatorTime & Systems
Parse, validate, and inspect cron expressions with Unix and a supported Quartz/AWS subset, IANA timezone matching, and upcoming runs.
Native Date / Intl API POSIX.1-2017 Unix Time Unix Timestamp ConverterConvert between Unix epoch timestamps (seconds/milliseconds), ISO 8601, and human-readable UTC and local time.
Date / Intl API (browser native) RFC 4632 (CIDR) CIDR & Subnet CalculatorCalculate IPv4 network address, broadcast address, netmask, wildcard mask, first and last usable host IP addresses, and CIDR prefix.
Bitwise 32-bit integer arithmetic (browser native)Text & Code
Test JavaScript regular expressions with live match highlighting, capture groups, named groups, replacement preview, and ECMAScript flags.
JavaScript RegExp (ECMAScript) RFC 3986 (URI) URL Encoder / ParserEncode and decode URI components and parse full URLs into protocol, hostname, path, query parameters table, and fragment.
encodeURIComponent / URL API (browser native) POSIX diff format convention Text Diff & ComparisonSide-by-side and unified text diff viewer with line-level and word-level change highlighting, additions, and deletions.
Longest Common Subsequence (LCS) algorithmSecurity & Encoding
Encode and decode Base64 and URL-safe Base64URL strings with full UTF-8 Unicode support via native TextEncoder/TextDecoder.
TextEncoder / TextDecoder (browser native) RFC 7519 (JWT) JWT Decoder & InspectorDecode JSON Web Token header and payload, inspect standard claims, and check expiry status. Client-side decoding only — signature not verified.
TextDecoder + JSON.parse (browser native) FIPS 180-4 (Secure Hash Standard) Hash Generator (SHA-256, 384, 512)Generate SHA-256, SHA-384, SHA-512, and legacy SHA-1 cryptographic digests of text or local files using Web Crypto.
Web Crypto API (crypto.subtle.digest)