Developer Utilities

Audit your CLI --help output for discoverability, flag consistency, examples, and error guidance

Generate Node or Python CLI scaffolds from OpenAPI with auth wiring, retries, pagination, and shell completion stubs

Turn CSV into mock JSON API responses, an OpenAPI 3.1 spec, and Cloudflare Worker, Express or FastAPI endpoint code with pagination.

Lint OpenProse flow graphs for unreachable stages, dangling edges, privileged paths, and approval gaps

Validate W3C traceparent and tracestate headers for distributed tracing correctness and propagation safety

Generate endpoint-level retry and idempotency contracts with deterministic test vectors and rollout guidance

Build strict CSP header templates and SRI tag snippets for frontend script hardening and safer deployments

Test JavaScript regular expressions with live match highlighting, capture groups, replace preview and plain-English pattern explanations.

Render Mermaid flowchart code as a diagram with live preview, subgraphs, light or dark theme, and SVG or PNG export.

Validate Docker Compose YAML for syntax errors, unknown keys, port and volume syntax, missing or circular depends_on, and undeclared networks.

Decode JSON Web Tokens to inspect the header, algorithm, standard and custom claims, readable timestamps and expiration status.

Render OpenAPI 3.x and Swagger 2.0 specs in JSON or YAML as API docs with endpoints grouped by tag, parameters and schemas.

Build GitHub Actions workflow YAML from a form, with Node, Python, Docker and Cloudflare Pages templates, matrix builds and cache steps.

Build and validate cron expressions with plain-English descriptions, next-run previews and an optional seconds field. Also available as a REST API.

Compare two texts or code snippets line by line in side-by-side or unified view and copy the unified diff. The API also diffs JSON and YAML.

Merge Base, Theirs and Mine versions of a text with a diff3 three-way merge, resolve each conflict by side, and copy or download the result.

Search and browse Tailwind CSS utility classes by category, see the CSS behind each one with a live preview, and copy class names.

Parse a GraphQL SDL schema and browse its types, fields, arguments and references, with search and checks for undefined types.

Build HTTP requests visually and generate code for cURL, fetch, axios, and Python with headers, auth, and query params

Test JSONPath expressions against JSON as you type, with filters and recursive descent, click-to-path on a JSON tree, and examples.

Look up HTTP status codes from 100 to 511 by number or keyword, with a description, details and typical use cases for each.

Parse and view JSONL (newline-delimited JSON) with interactive table, filtering, sorting, and export

Calculate IPv4 subnets, CIDR ranges, network addresses, and host counts with a visual binary breakdown

Generate ~/.ssh/config Host blocks with ProxyJump, local, remote and dynamic port forwarding, identity files, presets and security warnings.

Explain a shell command part by part, covering commands, flags, pipes and redirects, and warn about risky patterns like rm -rf or curl piped to sh.

Validate YAML, JSON5 and JSON config files with line-numbered syntax errors, lint warnings such as tab indentation, and conversion between formats.

Analyze webhook payloads with formatted JSON view, HMAC signature verification, timestamp detection, and cURL reconstruction

Sort JSON keys A-Z or Z-A, remove nulls and empty values, deduplicate arrays, strip keys, and flatten or unflatten nested objects in one pass.

Test glob patterns against file paths with *, **, ?, bracket classes, {a,b} braces and negated patterns, plus a pattern-by-path match matrix.

Set a mock response's status, headers, JSON body and delay, then copy it as a fetch() mock, MSW handler, Express route, curl command or Python mock.

Convert Unix permissions between numeric modes like 755 and symbolic rwx notation with a checkbox grid, setuid, setgid and sticky bits, and presets.

Parse, validate, edit, and convert .env files between JSON, YAML, Docker, and Shell formats

Test 5- or 6-field cron expressions, see upcoming run times in your timezone, and turn phrases like 'weekdays at 9am' into cron.

Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes for text or files

Validate a .env file against .env.example and catch missing variables, empty values and type mismatches.

Generate .env, .env.example and Markdown docs from Docker Compose files, Kubernetes manifests, a custom list or presets for eight frameworks.

Drag databases, caches, queues and load balancers onto a canvas, connect them, start from six templates, and export the design as PNG, SVG or JSON.

Scan Chrome extension permissions for security risks with risk scoring, dangerous combination detection, and plain-English explanations

Extract OG tags, canonical URLs, meta descriptions, and JSON-LD from pasted HTML

Detect website frameworks and platforms from pasted HTML, headers, and script URLs

Validate RSS/Atom XML and preview feed entries with parser diagnostics

Parse dig answer lines into structured A, AAAA, CNAME, MX, TXT and NS records with host, TTL and value, and flag TTLs longer than 24 hours.

Score pasted HTTP response headers on five security headers and summarize CORS and caching headers such as Access-Control-Allow-Origin and ETag.

Parse openssl x509 -text output for issuer, subject, SANs and validity dates, with warnings for expired certificates or ones expiring within 30 days.

Diff two OpenAPI JSON specs and list added, removed and changed endpoints by method and path as a Markdown changelog.

Verify a webhook's HMAC-SHA256 or HMAC-SHA1 signature against your signing secret, and inspect its headers, JSON body and timestamps.

Generate a .gitignore by combining templates for Node, Python, Java, Go, Rust, Docker, macOS, VS Code and JetBrains, with unknown stacks reported.

Generate a package.json scaffold for an app with Vite scripts or a library with tsc and Vitest scripts, set to ESM with type: module.

Check whether open source licenses such as MIT, Apache-2.0, GPL, LGPL, MPL and AGPL can be combined, with per-pair verdicts and an outbound license.

Check whether a version satisfies a ^, ~, >=, <= or exact semver range, or compare two x.y.z versions by major, minor and patch.

Generate a starter Dockerfile for Node, Python or Go with a slim or Alpine base image, a non-root user and your start command.

Diagnose a browser CORS error from its message and the response headers, and get the missing Access-Control headers plus an Express fix.

Generate random test API keys in generic, OpenAI-style, Anthropic-style or GitHub-style formats with a custom prefix and length.

Test JavaScript regular expressions with live match highlighting, numbered and named groups, a token-by-token explanation and replace mode.

Generate an RFC 6902 JSON Patch of add, remove and replace operations that turns a source JSON document into a target document.

Generate .env.example templates with secrets stripped, plus Markdown variable docs, from framework presets, Docker Compose or Kubernetes configs.

Build a GraphQL query or mutation from an operation name, dot-notation field paths and typed variables, with nested selections written for you.

Infer a JSON Schema (Draft-07 or 2020-12) from a sample JSON document, with options for required fields, titles, examples and additionalProperties.

Convert an API rate limit and window into requests per second, and check expected traffic for utilization, headroom and an over-limit warning.

Build an OAuth 2.0 authorization code URL with a random state value, or a token exchange cURL command for the code you get back.

Check the WCAG 2.1 contrast ratio between a text and background color in hex, rgb() or hsl(), with AA and AAA results for normal and large text.

Calculate and visualize CSS selector specificity. Paste selectors to see specificity scores, compare multiple selectors, and understand which styles win.

Encode a username and password into an HTTP Basic Authorization header or curl -H flag, or decode a Basic token back to plaintext credentials.

Build a Set-Cookie header and matching document.cookie line with Secure, HttpOnly, SameSite, Path, Domain, Expires, Max-Age and Partitioned.

Count words, characters with and without spaces, sentences, paragraphs and lines, with reading and speaking time and the 10 most frequent words.

Scan a .env file for exposed API keys, high-entropy secrets and insecure defaults, with key patterns for OpenAI, Anthropic, AWS, Stripe and GitHub.

Lint a Dockerfile with hadolint-style rules for latest tags, apt-get, root user, ADD vs COPY, cache order and HEALTHCHECK, with a score and fixes.

Parse or build PostgreSQL, MySQL, MongoDB, Redis and SQL Server connection strings, with masked and URL-encoded variants and SSL and password checks.

Validate Kubernetes YAML for 14 kinds against an embedded schema: required fields, apiVersion, image tags, resource limits, probes, security context.

Diff Helm values.yaml for dev, staging and prod side by side as dotted paths, with added, removed and changed keys and which environments set each.

Analyze an AWS IAM policy for wildcard actions and resources, privilege-escalation paths, public principals and missing conditions, with a risk score.

Split an AWS ARN into partition, service, region, account, resource type and ID, or build one from fields, with formats for 11 common services.

Parse a Server-Sent Events log into event and data frames and replay the streamed text at 0.25x to 4x, with a timing chart and event-type counts.

Edit CSS @container breakpoints, resize the parent by slider or drag handle to watch a component reflow, and copy the named-container CSS.

Preview fade, slide, scale, morph and flip View Transitions on a live element and copy the HTML, CSS and JS with the cross-document @view-transition.

Test getByRole, getByText, getByLabel, getByPlaceholder, CSS or XPath Playwright locators on pasted HTML, with match count and a stability score.

Decode binary protobuf payloads with optional .proto schemas. Inspect field tags, wire types, and nested messages.

Visualize OpenTelemetry traces (OTLP JSON or Jaeger) as a waterfall flame graph with span attributes, errors, and per-service summaries.

Analyze a HAR file with a request waterfall, blocking time, third-party breakdown by host, slow requests, headers, total transfer size and wall time.

Connect to ws:// or wss:// endpoints with the native browser WebSocket API. Send and receive frames in JSON, text, or hex.

Simplify a width and height to an aspect ratio, scale dimensions with a ratio lock, and copy the CSS aspect-ratio value, with common presets.

Compute an HMAC with SHA-1, SHA-256, SHA-384 or SHA-512 in hex or base64, and reproduce GitHub, Stripe and Slack webhook signature headers.

Build and sign a JSON Web Token with HS256, HS384 or HS512 from an editable header and claims, with an exp shortcut and an expiry readout.

Expand, compress and validate IPv6 addresses, including embedded IPv4, with hex and binary forms and the network and address count of a CIDR.

Generate bcrypt password hashes with an adjustable cost factor and verify a password against an existing hash, using the bcryptjs library.

Detect zero-width characters, bidi overrides, non-ASCII spaces and Cyrillic or Greek look-alike letters in text or code, and copy a sanitized version.