Developer & DevOps for Operations

174 developer & devops tools hand-picked for Operations.

AI Eval Planner

Generate eval cases, pass criteria, and edge cases from an AI feature, risks, and user path.
Apache Cheatsheet

Apache HTTP Server cheatsheet for httpd.conf, VirtualHost, .htaccess, mod_rewrite, SSL, proxying, auth, headers, and logs.
awk + sed Cheatsheet

awk + sed cheat sheet — 80+ one-liners for text processing, with real examples and common pitfalls.
AWS CLI Cheatsheet

AWS CLI cheat sheet — 80+ commands for EC2 / S3 / IAM / Lambda / RDS / EKS / CloudFormation with real examples.
AWS IAM Cheatsheet

Search AWS IAM policy fields, ARNs, conditions, managed policies, trust rules, and inspect policy JSON locally.
AWS S3 Cheatsheet

AWS S3 cheat sheet — 58+ commands covering buckets, sync, presign, versioning, lifecycle, encryption, CORS, and multipart.
Base64 Block Deduplicator

Find duplicates and keep one clean copy of base64 blocks from pasted text or uploaded local files.
Base64 Block Extractor

Extract, dedupe, and export base64 blocks from pasted text or uploaded local files.
Base64 Block List Converter

Convert base64 blocks from pasted text or uploaded local files.
Base64 Block List Validator

Validate and explain issues in base64 blocks from pasted text or uploaded local files.
Base64 Block Normalizer

Normalize, sort, and prepare base64 blocks from pasted text or uploaded local files.
Base64 to File Converter

Paste raw Base64 or a data URL, decode it locally, inspect bytes, and download the reconstructed file.
Base64URL Encoder Decoder for JWT-Safe Strings

Encode and decode URL-safe Base64 strings for JWT headers, payloads, tokens, and URL parameters without padding surprises.
Bash Cheatsheet

Bash cheat sheet — 100+ commands & idioms for variables, conditionals, loops, functions, pipes, traps, with real one-liners.
Batch File Rename Planner

Upload a batch, generate safe new filenames with sequence numbers and case rules, then export a CSV plan.
Bcrypt Generator

bcrypt password hash generator + verifier — pick rounds, hash and compare in browser.
JWT Decoder and Claims Inspector

Decode JWT headers and payloads locally, inspect registered claims, timing, audience and risk signals.
Cloudflare DNS Cheatsheet

Cloudflare DNS cheat sheet with proxy rules, TTL notes, CNAME flattening, mail records, and a local record checker
Common Ports Reference

TCP/UDP port cheat sheet, 60+ services, search by number or name, copy in one click, browser-only
Credit Card Number Deduplicator

Find duplicates and keep one clean copy of credit card numbers from pasted text or uploaded local files.
Credit Card Number Extractor

Extract, dedupe, and export credit card numbers from pasted text or uploaded local files.
Credit Card Number List Converter

Convert credit card numbers from pasted text or uploaded local files.
Credit Card Number List Validator

Validate and explain issues in credit card numbers from pasted text or uploaded local files.
Credit Card Number Normalizer

Normalize, sort, and prepare credit card numbers from pasted text or uploaded local files.
Cron Cheatsheet

Cron cheat sheet — 80+ entries covering syntax, time expressions, special strings, environment variables, crontab management, and common pitfalls.
Cron Expression Explainer — Decode Any Cron + Next 20 Runs

Cron expression explainer — paste any cron, get plain English/Chinese + next 20 runs + visual time grid.
Crontab Helper — Visual Builder & Explainer

Visual crontab builder + human-readable explanation + next run preview.
CSP Policy Auditor

Inspect Content-Security-Policy directives for unsafe sources, missing fallbacks, framing gaps, object-src, base-uri, and reporting coverage.
CSS Minifier

Minify CSS — strip comments, whitespace, shorten colors, merge selectors. 30-60% smaller.
CSV Column Extractor

Upload or paste CSV, keep only selected columns by name or index, and export a smaller privacy-safe file.
CSV Data Quality Profiler

Upload CSV or TSV and profile missing values, inferred types, invalid cells, duplicate rows, whitespace issues, top values, and numeric outliers.
CSV Deduplicator

Remove duplicate CSV rows by full row or selected key columns from uploaded files, locally and safely.
CSV Filter

Filter uploaded CSV rows by column value using contains, equals, or regex, with local browser processing.
CSV Header Normalizer

Standardize CSV header rows to snake_case, kebab-case, camelCase, or Title Case before imports and scripts.
CSV Sorter

Sort uploaded CSV rows by a selected column with numeric-aware ordering and local-only processing.
CSV Stats Summary

Upload CSV and get a quick Markdown profile of filled, missing, unique, numeric, min, max, and average values.
CSV ⇄ JSON Converter

Convert CSV to JSON or JSON to CSV — handles quoted commas, newlines in cells, custom delimiter — browser-only
CSV to Markdown Table

Convert uploaded or pasted CSV into clean Markdown tables with quoted-cell support, locally in the browser.
CSV to TSV Converter

Convert CSV files to tab-separated values while preserving quoted commas, quotes, and multiline cells locally.
CSV to YAML Converter

Turn a spreadsheet export into a clean YAML array of objects — RFC 4180 quoting, optional type inference, browser-only
CSV Transposer

Flip CSV rows and columns from uploaded files or pasted data, with ragged-row handling and local output.
curl Cheatsheet

curl cheat sheet — 80+ curl commands for GET/POST/auth/upload/download/SSL/proxy, with real examples and pitfalls.
DNS Record Explainer

DNS record explainer — all 18 common record types (A, AAAA, CNAME, MX, TXT, SRV, etc.) with syntax, examples, and gotchas.
Docker Cheatsheet

Docker command cheat sheet — 80+ commands with real examples, common mistakes, and Compose section.
Domain Name Deduplicator

Find duplicates and keep one clean copy of domain names from pasted text or uploaded local files.
Domain Name Extractor

Extract, dedupe, and export domain names from pasted text or uploaded local files.
Domain Name List Converter

Convert domain names from pasted text or uploaded local files.
Domain Name List Validator

Validate and explain issues in domain names from pasted text or uploaded local files.
Domain Name Normalizer

Normalize, sort, and prepare domain names from pasted text or uploaded local files.
Duplicate File Finder

Upload a batch and find exact duplicate files by SHA hash locally, with a Markdown cleanup report.
EAN / UPC Check Digit Calculator

Compute or verify the check digit for EAN-13, UPC-A and EAN-8 barcodes, mod-10 weighting with the odd and even positions, browser-only
Elasticsearch Cheatsheet

Elasticsearch cheat sheet — 80+ Query DSL, mapping, analyzer, aggregation, replication, with real examples.
Email Address Deduplicator

Find duplicates and keep one clean copy of email addresses from pasted text or uploaded local files.
Email Address Extractor

Extract, dedupe, and export email addresses from pasted text or uploaded local files.
Email Address List Converter

Convert email addresses from pasted text or uploaded local files.
Email Address List Validator

Validate and explain issues in email addresses from pasted text or uploaded local files.
Email Address Normalizer

Normalize, sort, and prepare email addresses from pasted text or uploaded local files.
Email Validator

Validate emails — RFC 5321 syntax + bulk paste + disposable detection + MX hint.
ENV Secret Scanner

Scan .env files, config snippets, and CI logs locally for likely API keys, tokens, private keys, JWTs, and database URLs.
Environment Variable Deduplicator

Find duplicates and keep one clean copy of environment variables from pasted text or uploaded local files.
Environment Variable Extractor

Extract, dedupe, and export environment variables from pasted text or uploaded local files.
Environment Variable List Converter

Convert environment variables from pasted text or uploaded local files.
Environment Variable List Validator

Validate and explain issues in environment variables from pasted text or uploaded local files.
Environment Variable Normalizer

Normalize, sort, and prepare environment variables from pasted text or uploaded local files.
Excel Column Converter

Turn column letters into numbers and back: A is 1, Z is 26, AA is 27, batch convert, paste A1 refs, copy in one click, all in your browser
File Checksum Compare

Paste an expected checksum, upload a file, and verify SHA digest matches locally before installing or sharing.
File Hash Calculator

Compute SHA-1, SHA-256, SHA-384, or SHA-512 hashes for uploaded files entirely in the browser.
File MIME Type Inspector

Upload files and inspect filename, size, browser MIME type, extension, and magic-byte signature locally.
File to Base64 Converter

Upload a small file and convert it to raw Base64 or a data URL locally for embeds, fixtures, and tests.
Filename Sanitizer

Strip illegal characters and make any string a safe cross-platform filename, in your browser
Font File Inspector

Upload TTF or OTF files and extract family names, PostScript names, version, units per em, glyph count, and table list.
Git Cheatsheet

Git command cheat sheet — searchable, with explanations, common mistakes, and real examples.
GitLab CI Cheatsheet

GitLab CI/CD cheat sheet — 80+ entries covering pipeline structure, job config, rules, variables, artifacts, runners, templates, security, and the GitLab API.
HAR Performance Analyzer

Upload a Chrome DevTools HAR file and get a local performance, cache, host, asset, status, and security-header report.
Hash Type Detector

Paste any hash string and instantly identify MD5, SHA-256, bcrypt, Argon2, and 30+ other formats
.htaccess Generator

Generate Apache .htaccess — HTTPS redirect, www toggle, gzip, cache headers, hotlink protection.
HTML Link Extractor

Upload HTML and extract anchors, images, scripts, stylesheets, canonicals, and meta URLs into CSV locally.
HTML Minifier

Minify HTML — strip comments, whitespace, optional attributes, inline CSS/JS. 40-60% smaller.
HTTP Header Deduplicator

Find duplicates and keep one clean copy of http headers from pasted text or uploaded local files.
HTTP Header Extractor

Extract, dedupe, and export http headers from pasted text or uploaded local files.
HTTP Header List Converter

Convert http headers from pasted text or uploaded local files.
HTTP Header List Validator

Validate and explain issues in http headers from pasted text or uploaded local files.
HTTP Header Normalizer

Normalize, sort, and prepare http headers from pasted text or uploaded local files.
HTTP Security Header Auditor

Audit raw response headers for HSTS, CSP, cookie flags, MIME sniffing, clickjacking, referrer, and permissions policy gaps.
HTTP Status Code Explorer

HTTP status code explorer — all 70+ codes with meaning, common causes, real examples, and what to check.
Image Metadata Inspector

Inspect PNG, JPEG, GIF, WebP, and SVG dimensions, bit depth, ICC, EXIF, XMP, animation, and notes.
INI Formatter & Validator

Format and validate INI / TOML-like config — sort sections, align equal signs.
IPv4 Address Deduplicator

Find duplicates and keep one clean copy of ipv4 addresses from pasted text or uploaded local files.
IPv4 Address Extractor

Extract, dedupe, and export ipv4 addresses from pasted text or uploaded local files.
IPv4 Address List Converter

Convert ipv4 addresses from pasted text or uploaded local files.
IPv4 Address List Validator

Validate and explain issues in ipv4 addresses from pasted text or uploaded local files.
IPv4 Address Normalizer

Normalize, sort, and prepare ipv4 addresses from pasted text or uploaded local files.
IPv6 Address Deduplicator

Find duplicates and keep one clean copy of ipv6 addresses from pasted text or uploaded local files.
IPv6 Address Extractor

Extract, dedupe, and export ipv6 addresses from pasted text or uploaded local files.
IPv6 Address List Converter

Convert ipv6 addresses from pasted text or uploaded local files.
IPv6 Address List Validator

Validate and explain issues in ipv6 addresses from pasted text or uploaded local files.
IPv6 Address Normalizer

Normalize, sort, and prepare ipv6 addresses from pasted text or uploaded local files.
JS Minifier

Minify JavaScript — strip comments, whitespace, optional name shortening. 40-70% smaller.
JS Obfuscator

Lightly obfuscate JavaScript in the browser: strip comments, remove debugger/console calls, and optionally wrap strings with base64.
JSON Lines Formatter

Validate JSONL line by line, pretty-print it, convert to a JSON array, or export a CSV-like table locally.
JSON Minifier

Minify JSON into a compact single line, optionally sort object keys, and keep everything local.
JSON Schema Inferencer

Paste JSON or NDJSON samples and infer a Draft 2020-12 style schema with types, required fields, formats, enums, and examples.
JWT Decoder

Decode JWT header / payload / signature — verify structure, check exp, copy claims — browser-only
JWT Token Deduplicator

Find duplicates and keep one clean copy of jwt tokens from pasted text or uploaded local files.
JWT Token Extractor

Extract, dedupe, and export jwt tokens from pasted text or uploaded local files.
JWT Token List Converter

Convert jwt tokens from pasted text or uploaded local files.
JWT Token List Validator

Validate and explain issues in jwt tokens from pasted text or uploaded local files.
JWT Token Normalizer

Normalize, sort, and prepare jwt tokens from pasted text or uploaded local files.
kubectl Cheatsheet

kubectl cheat sheet — 100+ Kubernetes commands with real examples, common pitfalls, and YAML snippets.
Linux Permission (chmod) Calculator

Linux permission (chmod) calculator — convert between octal (755), symbolic (rwxr-xr-x), and ls -l forms, with safety warnings.
List Comparison

Compare two lists line by line: only in A, only in B, in both, and merged — all in your browser
LLM Pricing Calculator

Estimate daily and monthly LLM spend from tokens, request volume, and editable model prices.
Local File Workbench

Triage a mixed batch locally for file type mismatches, duplicate candidates, metadata privacy, archive risks, and next-step tools.
Log Error Analyzer

Paste logs and group repeated errors, warnings, stack traces, HTTP statuses, endpoint patterns, and time ranges into a local incident report.
Log Line Cleaner

Clean noisy logs by removing timestamps, ANSI colors, blank lines, long lines, or non-error entries in your browser.
Logrotate Cheatsheet

Logrotate cheat sheet — directives, CLI flags, postrotate scripts, pitfalls, and copy-ready config templates for nginx, rsyslog, and app logs.
Loki Cheatsheet

Grafana Loki cheat sheet — 80+ entries covering LogQL stream selectors, line filters, parsers, metric queries, aggregations, Promtail stages, Loki config, and HTTP API.
MAC Address Deduplicator

Find duplicates and keep one clean copy of mac addresses from pasted text or uploaded local files.
MAC Address Extractor

Extract, dedupe, and export mac addresses from pasted text or uploaded local files.
MAC Address List Converter

Convert mac addresses from pasted text or uploaded local files.
MAC Address List Validator

Validate and explain issues in mac addresses from pasted text or uploaded local files.
MAC Address Normalizer

Normalize, sort, and prepare mac addresses from pasted text or uploaded local files.
MD5 / SHA Hash Generator

Compute MD5 / SHA-1 / SHA-256 / SHA-384 / SHA-512 hashes, all five at once, browser-only
MongoDB Cheatsheet

MongoDB cheat sheet — 80+ shell commands & query operators for CRUD, aggregation, indexing, replication.
Netlify Redirects Cheatsheet

Netlify _redirects and netlify.toml cheatsheet for rewrites, proxies, SPA fallbacks, splats, status codes, and country/language rules.
Nginx Cheatsheet

Nginx cheat sheet — common configs, location/server blocks, SSL, reverse proxy, gzip, real examples & gotchas.
nginx Docker Config Generator

Generate nginx.conf and Docker CMD for container log routing — access_log /dev/stdout, error_log /dev/stderr, daemon off.
Number Extractor

Pull every number out of any text: integers, decimals, negatives, 1,234 commas, percents and 6.02e23, with instant sum and average
OAuth Scope Cheatsheet

OAuth 2.0 scope reference — 60+ scopes across Google, GitHub, Microsoft, Slack, Spotify, Discord and more, with access level, use cases and risk rating.
Office Document Inspector

Inspect DOCX, XLSX, and PPTX package structure for macros, media, embedded objects, custom XML, and size hotspots.
OpenAPI Endpoint Auditor

Audit OpenAPI JSON or YAML for endpoint coverage, missing operation IDs, security gaps, and weak response documentation.
package.json Cheatsheet

package.json field reference — 55+ fields explained with real examples, bilingual, searchable.
Package Lock Dependency Auditor

Inspect package-lock.json, pnpm-lock.yaml, or yarn.lock for duplicate versions, risky sources, prereleases, and missing integrity.
Password Strength Checker

Check password strength — entropy, time-to-crack, breach pattern check (offline).
PDF Metadata Extractor

Upload PDFs and extract document metadata, page-count hints, encryption flags, and producer details locally.
pnpm Workspace Cheatsheet

Dense, searchable pnpm workspace reference — 60+ commands covering filter syntax, workspace protocols, recursive scripts, and monorepo pitfalls.
PostgreSQL Cheatsheet

PostgreSQL cheat sheet — 80+ commands & functions for psql, JSONB, CTEs, window functions, indexing, partitioning, advanced extensions.
Prometheus Cheatsheet

Prometheus cheat sheet — 90+ entries covering PromQL selectors, aggregations, functions, alerting rules, recording rules, HTTP API, and relabeling.
RabbitMQ Cheatsheet

RabbitMQ cheat sheet — 90+ commands and patterns for queues, exchanges, clustering, and common pitfalls.
Redis Cheatsheet

Redis cheat sheet — 80+ commands across strings, hashes, lists, sets, sorted sets, pub/sub, streams, scripts, with examples and pitfalls.
Robots.txt Auditor

Check robots.txt for user-agent groups, allow and disallow rules, sitemap declarations, crawl-delay, and unsupported directives.
Semantic Version Deduplicator

Find duplicates and keep one clean copy of semantic versions from pasted text or uploaded local files.
Semantic Version Extractor

Extract, dedupe, and export semantic versions from pasted text or uploaded local files.
Semantic Version List Converter

Convert semantic versions from pasted text or uploaded local files.
Semantic Version List Validator

Validate and explain issues in semantic versions from pasted text or uploaded local files.
Semantic Version Normalizer

Normalize, sort, and prepare semantic versions from pasted text or uploaded local files.
SQL Formatter

Format and beautify SQL — supports MySQL, PostgreSQL, BigQuery, SQLite and 17 more dialects.
SSH Config Cheatsheet

SSH config cheatsheet — 50+ directives for ~/.ssh/config with copy-ready examples and common pitfalls.
SVG Asset Auditor

Audit SVG viewBox, dimensions, scripts, external references, styles, ids, classes, title, and desc tags.
Terraform Cheatsheet

Terraform cheat sheet — 90+ commands for init, plan, apply, state, workspaces, import, and debug with real examples.
Text File Cleaner

Upload a text file and remove BOM, null bytes, trailing spaces, and excessive final blank lines locally.
Text File Line Ending Converter

Upload or paste text and convert CRLF, CR, and LF endings to a consistent LF or CRLF output locally.
Unix Timestamp Converter

Unix timestamp ⇄ human date — seconds / milliseconds / ISO 8601 — UTC and local — browser-only
TOML to JSON Converter

Paste TOML, get clean JSON instantly — full TOML 1.0 support, error messages with line numbers, 100% in-browser
TSV to CSV Converter

Turn tab-separated files into standards-friendly CSV with proper quoting, download, and local processing.
URL Deduplicator

Find duplicates and keep one clean copy of urls from pasted text or uploaded local files.
URL Encoder Decoder with Query Parameter Table

Encode, decode, inspect query parameters, process bulk URL lists, and copy clean outputs entirely in your browser.
URL Extractor

Extract, dedupe, and export urls from pasted text or uploaded local files.
URL List Converter

Convert urls from pasted text or uploaded local files.
URL List Validator

Validate and explain issues in urls from pasted text or uploaded local files.
URL Normalizer

Normalize, sort, and prepare urls from pasted text or uploaded local files.
URL Query Params Extractor

Extract, deduplicate, inspect, copy, and export query parameters from one URL or many URLs locally.
UUID Deduplicator

Find duplicates and keep one clean copy of uuids from pasted text or uploaded local files.
UUID Extractor

Extract, dedupe, and export uuids from pasted text or uploaded local files.
UUID List Converter

Convert uuids from pasted text or uploaded local files.
UUID List Validator

Validate and explain issues in uuids from pasted text or uploaded local files.
UUID Normalizer

Normalize, sort, and prepare uuids from pasted text or uploaded local files.
Vim Cheatsheet

Vim cheat sheet — 100+ commands covering modes, motions, edits, search, registers, splits, with mnemonics.
XML Formatter & Validator

Pretty-print, minify, and validate XML in your browser — preserves CDATA, comments, and namespaces.
XML ⇄ JSON Converter

XML to JSON converter — preserves attributes, nested elements, CDATA. Reversible.
YAML Formatter & Validator

Format and beautify YAML — re-indent, validate, minify, sort keys.
YAML to CSV Converter

Turn a YAML list of objects into an RFC 4180 CSV — column union, JSON or flattened nested values, comma / semicolon / tab, browser-only
YAML ⇄ JSON Converter

Convert between YAML and JSON — both directions, pretty-printed, error messages with line numbers — browser-only
ZIP Manifest Inspector

Read a ZIP central directory locally and flag traversal paths, encryption, duplicate names, and risky ratios.

AI Eval Planner

Apache Cheatsheet

awk + sed Cheatsheet

AWS CLI Cheatsheet

AWS IAM Cheatsheet

AWS S3 Cheatsheet

Base64 Block Deduplicator

Base64 Block Extractor

Base64 Block List Converter

Base64 Block List Validator

Base64 Block Normalizer

Base64 to File Converter

Base64URL Encoder Decoder for JWT-Safe Strings

Bash Cheatsheet

Batch File Rename Planner

Bcrypt Generator

JWT Decoder and Claims Inspector

Cloudflare DNS Cheatsheet

Common Ports Reference

Credit Card Number Deduplicator

Credit Card Number Extractor

Credit Card Number List Converter

Credit Card Number List Validator

Credit Card Number Normalizer

Cron Cheatsheet

Cron Expression Explainer — Decode Any Cron + Next 20 Runs

Crontab Helper — Visual Builder & Explainer

CSP Policy Auditor

CSS Minifier

CSV Column Extractor

CSV Data Quality Profiler

CSV Deduplicator

CSV Filter

CSV Header Normalizer

CSV Sorter

CSV Stats Summary

CSV ⇄ JSON Converter

CSV to Markdown Table

CSV to TSV Converter

CSV to YAML Converter

CSV Transposer

curl Cheatsheet

DNS Record Explainer

Docker Cheatsheet

Domain Name Deduplicator

Domain Name Extractor

Domain Name List Converter

Domain Name List Validator

Domain Name Normalizer

Duplicate File Finder

EAN / UPC Check Digit Calculator

Elasticsearch Cheatsheet

Email Address Deduplicator

Email Address Extractor

Email Address List Converter

Email Address List Validator

Email Address Normalizer

Email Validator

ENV Secret Scanner

Environment Variable Deduplicator

Environment Variable Extractor

Environment Variable List Converter

Environment Variable List Validator

Environment Variable Normalizer

Excel Column Converter

File Checksum Compare

File Hash Calculator

File MIME Type Inspector

File to Base64 Converter

Filename Sanitizer

Font File Inspector

Git Cheatsheet

GitLab CI Cheatsheet

HAR Performance Analyzer

Hash Type Detector

.htaccess Generator

HTML Link Extractor

HTML Minifier

HTTP Header Deduplicator

HTTP Header Extractor