DEA · Developer Engineering Atlas
Developer tools and technical references
DEA provides 25 tools for JSON, SQL, cryptography, networking, and the JVM, with principles, inputs, outputs, limitations, and common mistakes.
CORE TOOLS
Common lookup and formatting tools
Unix Timestamp and ISO 8601 ConverterConvert seconds, milliseconds, UTC, offsets, and IANA time zones.
SQL Formatter and Pretty PrinterFormat SQL with dialect-aware line breaks, indentation, and keyword case.
Domain RDAP LookupInspect domain status, registrar, events, and nameservers.
IP, ISP, ASN, and Country/Region LookupInspect public network ownership and estimated region data.
All 25 tools
JSON formatter, minifier, and validatorFormat, minify, and validate JSON with clear syntax errors.Timestamp, ISO 8601, and time-zone converterConvert Unix seconds, milliseconds, ISO 8601, and time-zone representations.Regular expression testerTest patterns, flags, matches, and match indexes.SQL schema, CRUD, and Java record generatorGenerate database DDL, CRUD SQL, and Java records from column definitions.SQL formatter and pretty printerFormat SQL with dialect, keyword case, indentation, and line-break controls.Base64, URL encoding, and SHA-256Run Base64, URL encoding, and SHA-256 hashing in the browser.AES-GCM, HMAC, and PBKDF2 toolsRun AES-256-GCM encryption, HMAC, SHA-2, and PBKDF2 key derivation.Secure password generator and entropy estimatorGenerate passwords with Web Crypto and estimate theoretical entropy.QR Code PNG generatorGenerate downloadable QR Code PNG files with L, M, Q, or H error correction.Memory and storage unit converterConvert bytes and decimal SI or binary IEC storage units.IPv4 CIDR and subnet calculatorCalculate netmask, network, broadcast, and usable ranges from an IPv4 address and prefix.My IP and proxy-source inspectionInspect the source IP and User-Agent received by the server.DNS record lookupQuery A, AAAA, CNAME, MX, NS, TXT, and SOA records.Domain RDAP lookupRetrieve public domain registration data, status, events, nameservers, and DNSSEC information.IP, ISP, ASN, and country/region lookupLook up ISP, ASN, country/region, city, and time-zone data for a public IP address.JVM heap-sizing calculatorEstimate Xms, Xmx, and Xss from container, thread-stack, and native-memory budgets.Java thread dump and sampled-stack graphAnalyze thread dumps, state counts, folded stacks, and an interactive sampled-stack graph.XML formatter and structural validatorParse XML, report structural errors, and apply consistent indentation.HTML entity encoder and decoderEncode and decode ampersands, angle brackets, quotes, and other HTML characters.URL structure parserInspect scheme, host, port, path, query parameters, and fragment.JWT header and payload decoderInspect JWT headers and payload claims without claiming signature verification.Base 2 to 36 integer converterUse BigInt to convert integers between bases 2 and 36.UUID v4 batch generatorGenerate one or more random UUID v4 identifiers with Web Crypto.Text diff and presence comparisonMark line additions and removals or compare line presence only.HEX, RGB, and HSL color converterOutput CSS-ready HEX, rgb(), and hsl() representations.