Digital Opus Developer

Technical utilities in your browser

Inspect. Transform.
Keep moving.

Open one Workbench for structured data, files, text, networking, code, and everyday developer calculations. Your working inputs stay in the browser, and no account is required.

Open the complete WorkbenchBrowse every utility
39focused utilities
5technical labs
0accounts required

Data Lab

Structured data inspection, CSV/JSON/XML cleaning, SQL formatting, log parsing, dataset profiling

data

CSV Workbench & Cleaner

CSV viewer, cleaner, delimiter detector, row merge/split, CSV ↔ JSON converter, and encoding checker.

Open CSV Workbench & Cleaner

data

JSON Workbench & Diff

JSON formatting, syntax validation, documented JSONPath subset queries, schema inference, and structural diff.

Open JSON Workbench & Diff

data

Log File Analyzer

Multi-format log parser (Apache/Nginx/Syslog/JSON), level filter (INFO/WARN/ERR), stack trace highlight, and entry frequency visualizer.

Open Log File Analyzer

data

SQL Workbench & SQLite Playground

Real browser-local SQLite WASM query runner, schema inspection, CSV import, and database export over HTTP. Disabled in file:// preview.

Open SQL Workbench & SQLite Playground

data

Dataset Profiler & Stats

Dataset statistics, missing value detector, duplicate row analysis, column transformations, and dataset diff.

Open Dataset Profiler & Stats

data

YAML ↔ JSON Converter

Converts between YAML and JSON for a documented subset (block/flow mappings and sequences, quoted/plain scalars, comments). Anchors, tags, and block scalars are not supported.

Open YAML ↔ JSON Converter

File Lab

Universal file inspection, binary hex inspection, EXIF/ID3 metadata, checksums, browser ZIP extraction

files

Hex / Binary Viewer & Inspector

Bounded text-to-byte hex grid with offsets and ASCII representation, plus click-to-inspect multi-byte integer/float interpretation in both endiannesses. Large previews are capped at 64 KiB.

Open Hex / Binary Viewer & Inspector

files

EXIF & Media Metadata Inspector

JPEG EXIF (Make/Model/DateTime/exposure/GPS) and MP3 ID3v2.3/2.4/ID3v1 tag parsing from real file bytes; PNG stays dimensions-only.

Open EXIF & Media Metadata Inspector

Text Lab

Multi-case text transformations, line tools, diff visualizers, regex playground, unicode & character analysis

text

Text Transformer & Line Tools

Multi-case converter (camel, snake, kebab, title, constant), line sort/dedupe/reverse, line numbers, and text cleanup.

Open Text Transformer & Line Tools

text

Text Diff Visualizer

Side-by-side split and unified diff visualizer with word-level and line-level difference highlighting.

Open Text Diff Visualizer

text

Interactive Regex Playground

Real-time regex evaluator, match highlighting, capture group breakdown, replace sandbox, and pattern cheat sheet.

Open Interactive Regex Playground

text

Unicode & Character Inspector

Code point inspector, grapheme cluster vs byte length counter, zero-width / invisible character detector & stripper.

Open Unicode & Character Inspector

text

Color Converter

Convert colors between HEX (3/4/6/8-digit), RGB/RGBA, HSL/HSLA, and HSV, with a live swatch preview.

Open Color Converter

text

Text Statistics & Readability

Character/word/sentence/paragraph counts, Flesch Reading Ease and Flesch-Kincaid Grade Level (heuristic syllable estimate), and stopword-filtered word frequency.

Open Text Statistics & Readability

Network Lab

IPv4/IPv6 subnet & CIDR calculation, DNS record inspection, IANA port catalog, HTTP headers & URL inspection

network

DNS Record Inspector

Parses raw dig/nslookup answer output (A, AAAA, CNAME, MX, NS, TXT, SOA) into a structured table with human-readable TTL formatting. Unrecognized lines are reported, not silently dropped.

Open DNS Record Inspector

network

Port Reference Catalog (IANA Snapshot)

Searchable catalog of well-known IANA-assigned ports (a curated subset, not the full 0-65535 range) with operational and protocol considerations.

Open Port Reference Catalog (IANA Snapshot)

network

HTTP Header & URL Inspector

URL parser (query parameters, hash, path), HTTP raw header inspector, security headers checklist, and User-Agent decoder.

Open HTTP Header & URL Inspector

network

HAR File & Network Trace Inspector

Parse browser HAR network logs, request timeline, status code distribution (2xx/4xx/5xx), slowest endpoints, and payload sizes.

Open HAR File & Network Trace Inspector

network

HTTP Status Code Reference

Searchable full IANA HTTP status code registry (RFC 9110 plus common WebDAV/extension codes) with category and description for every code.

Open HTTP Status Code Reference

Developer Lab

JWT decoding & status, epoch timestamp matrix, cron schedule visualizer, POSIX chmod permissions, UUID/ULID generation

developer

JWT Workbench & Inspector

Decode JWT Header & Payload JSON, claim expiration timer, signature status, and client-side HMAC SHA-256 key verification.

Open JWT Workbench & Inspector

developer

PEM / X.509 Certificate Inspector

Local inspection of PEM/X.509 SSL certificates: Subject, Issuer, Validity window, serial number, fingerprints, and SAN extensions.

Open PEM / X.509 Certificate Inspector

developer

Timestamp & Timezone Matrix

Unix epoch timestamp (s/ms/us) converter to ISO 8601, relative time ("x minutes ago"), and multi-timezone matrix.

Open Timestamp & Timezone Matrix

developer

Cron Expression Visualizer

Documented 5-field cron subset validator, plain-English description, and computed upcoming run times via forward simulation.

Open Cron Expression Visualizer

developer

POSIX Chmod Permissions Calculator

Interactive POSIX permission matrix (Read, Write, Execute for Owner/Group/Others), octal 755/644, symbolic rwx, setuid/setgid.

Open POSIX Chmod Permissions Calculator

developer

JSON / CSS / XML Code Beautifier

Real format/minify for JSON, CSS, and XML. JavaScript and HTML are not supported — a naive hand-rolled formatter for either risks corrupting strings, regex literals, or embedded script/style blocks.

Open JSON / CSS / XML Code Beautifier

developer

Number Base Converter

Arbitrary-precision conversion between binary, octal, decimal, and hexadecimal via BigInt — not limited to 32/53-bit integers.

Open Number Base Converter

developer

.env File Parser & Validator

Parses KEY=VALUE assignments with export prefix, quoted/escaped values, and inline comments; flags invalid keys, missing "=", unterminated quotes, and duplicate keys.

Open .env File Parser & Validator

developer

QR Code Generator

Real ISO/IEC 18004 encoder (versions 1-6, byte mode, genuine Reed-Solomon error correction) with SVG/PNG export. Alphanumeric/Kanji modes and versions 7+ are not supported.

Open QR Code Generator

Local-first boundary

Your working data stays separate from Analytics.

Files, pasted data, tokens, certificates, queries, and working text are handled in the browser. Google Analytics may measure broad page usage, but it does not include those working inputs. The SQLite utility loads its runtime from this site rather than a third-party CDN.

Common questions

What to know before opening the Workbench.

Do these tools upload my files?

The integrated utilities process working files and pasted content in the browser. Analytics is limited to broad page usage.

Do I need to install anything?

No. A current desktop browser provides the broadest support; many tools also work on mobile.

Are security results authoritative?

No. Inspectors and calculators are practical aids, not substitutes for professional security review or production validation.