A growing collection of online developer tools, DevOps utilities, security tools, networking tools, JSON tools, and encoding tools — built for developers, DevOps engineers, security professionals, network engineers, and technical teams.
No uploads · No accounts · No tracking · Free to use
DevCraftKit is a free collection of online developer tools and utilities covering security, DevOps, networking, JSON & data, encoding, and everyday development tasks. Every tool is designed to run directly in your browser — there's no server-side processing to wait on, no account to create, and nothing you paste gets uploaded.
DevCraftKit is built around a simple idea: developers shouldn't need a dozen different bookmarked websites — each with its own interface and its own data-handling practices — just to format some JSON, calculate a subnet, or scrub secrets out of a log file before sharing it. DevCraftKit brings practical, single-purpose utilities together in one consistent, privacy-friendly toolkit.
- 🌐 Browser-based — tools run using your browser's JavaScript engine
- 🔒 Privacy-friendly — designed to process data locally wherever applicable
- 🆓 Free to use — no account, sign-up, or usage limits
- ⚡ Fast — no server round-trip for most tools
- 📈 Continually expanding — new developer utilities are added regularly
DevCraftKit organizes its tools into six main categories. The site currently presents around 30 tools, a mix of tools that are live today and tools that are planned and coming soon.
Security utilities for redacting, decoding, and generating the things that keep systems safe — including log sanitization, HTTP security header analysis, JWT tools, secret scanning, password generation, and hash generation. 👉 View Security Tools
Validators and testers for the configuration behind every deploy — regex testing, cron expression building, Docker Compose validation, Kubernetes YAML validation, and Nginx config validation. 👉 View DevOps Tools
Tools for formatting, comparing, and converting structured data — JSON formatting and validation, JSON diffing, YAML-to-JSON conversion, and XML formatting. 👉 View JSON & Data Tools
Tools for looking up, calculating, and parsing network-facing data — CIDR calculation, DNS lookup, IP calculation, WHOIS lookup, subnet mask conversion, port lookups, and User-Agent parsing. 👉 View Networking Tools
Tools for converting text between the formats systems actually speak — Base64 encoding, URL encoding, and HTML entity encoding. 👉 View Encoding Tools
Small, focused helpers for everyday development tasks — UUID generation, Unix timestamp conversion, Lorem Ipsum generation, and slug generation. 👉 View Utilities
These tools are live today on DevCraftKit:
| Tool | Category | Description |
|---|---|---|
| Log Sanitizer | Security | Masks secrets, tokens, credentials, and PII in logs before you share them — entirely in your browser. |
| HTTP Security Headers Analyzer | Security | Analyzes HTTP response headers for missing protections, CSP weaknesses, CORS risks, and cookie flag issues. |
| JSON Formatter | JSON & Data | Formats, validates, beautifies, minifies, and explores JSON instantly, with a tree view and JSON Path finder. |
| CIDR Calculator | Networking | Calculates subnet information from an IPv4 CIDR block — network address, broadcast address, subnet mask, wildcard mask, and usable host range. |
Paste application logs, API responses, or upload a log file, and Log Sanitizer automatically detects and masks sensitive information — secrets, API keys, tokens, credentials, and PII — before you share it with an AI assistant, a GitHub issue, Slack, Jira, or a support ticket. Detection runs locally in your browser, so the raw log never has to leave the tab.
Paste a set of HTTP response headers and get a security-configuration analysis covering missing protections, Content-Security-Policy weaknesses, CORS misconfigurations, and cookie security flags — plus a score and recommendations. It works entirely from the headers you paste in; it doesn't fetch or crawl a URL, and nothing is uploaded.
👉 Open HTTP Security Headers Analyzer
A browser-based JSON formatter, validator, and beautifier. Format, minify, and validate JSON instantly, with a tree view, a JSON Path finder, duplicate-key detection, and clear error messages that point to the exact line and column of a problem — all without uploading your JSON anywhere.
A free IPv4 subnet calculator. Enter an address in CIDR notation and instantly get the network address, broadcast address, subnet mask, wildcard mask, usable host range, total address count, and binary representation — along with a full CIDR cheat sheet from /0 to /32.
DevCraftKit is actively expanding. The following tools are planned and not yet available — they're listed here for transparency, not as live tools:
Security: Secret Scanner · JWT Decoder · JWT Generator · Password Generator · Hash Generator · SSL Certificate Viewer
DevOps: Regex Tester · Cron Builder · Docker Compose Validator · Kubernetes YAML Validator · Nginx Config Validator
JSON & Data: JSON Diff · YAML to JSON · XML Formatter
Networking: DNS Lookup · IP Calculator · WHOIS Lookup · Subnet Mask Calculator · Port Checker · User Agent Parser
Encoding: Base64 Encoder · URL Encoder · HTML Encoder
Utilities: UUID Generator · Unix Timestamp Converter · Lorem Ipsum Generator · Slug Generator
See the full, current status of every tool on the All Tools page.
Your data stays in your browser.
Privacy is a core part of how DevCraftKit's tools are built, not an afterthought. Tools are designed to process data locally in your browser wherever applicable, so pasted text, uploaded files, and generated values don't need to be sent to a server for the tool to work.
This matters most for the kind of data developers handle every day:
- Logs that may contain internal hostnames, stack traces, or request data
- Tokens and credentials like API keys, JWTs, and session cookies
- JSON payloads from internal APIs or configuration
- Configuration files that may reference internal infrastructure
- Security-sensitive data such as HTTP headers or connection strings
Because processing happens on your device, there's no upload step where that data could be intercepted or logged before you've had a chance to review or sanitize it.
👉 Read the full Privacy Policy
- Free to use — every tool, no paywalls
- No account required — open a tool and start using it
- Browser-based — nothing to install
- Privacy-friendly — designed for local, client-side processing
- Fast — no waiting on server round-trips
- Practical — focused on real, everyday developer tasks
- Developer-focused — built by someone who uses these tools daily
- Continuously expanding — new tools added regularly across multiple categories
Need to sanitize logs before sharing them? Use the DevCraftKit Log Sanitizer to mask secrets, tokens, and PII in logs.
Need to format or validate JSON? Use the DevCraftKit JSON Formatter — a free online JSON formatter, validator, and beautifier.
Need to calculate a subnet or CIDR range? Use the DevCraftKit CIDR Calculator, a free subnet calculator for IPv4 addresses.
Need to check your site's security headers? Use the HTTP Security Headers Analyzer to check for missing protections and CSP or CORS issues.
Need developer utilities without installing anything? Explore DevCraftKit's browser-based tools — free, online, and no sign-up required.
Need security tools for everyday workflows? Explore the Security category.
Need networking or DevOps utilities? Explore the Networking and DevOps categories.
DevCraftKit's Blog / Learning Center publishes practical guides on networking, security, and logging — including topics like CORS, HTTP security headers (HSTS, Content-Security-Policy), and other everyday security and web concepts developers run into.
What is DevCraftKit? DevCraftKit is a free collection of online developer tools covering security, DevOps, networking, JSON, encoding, and everyday utilities. Tools run in your browser, so results are instant and nothing you enter is uploaded.
Is DevCraftKit free? Yes. Every tool is free to use, with no account, sign-up, or usage limit.
Are DevCraftKit tools online? Yes. All tools are accessed directly at devcraftkit.com through your web browser — no installation required.
Do I need an account? No. No account or sign-up is required for any tool.
Is DevCraftKit privacy-friendly? Yes. Most tools process everything locally in your browser, so pasted text, files, and generated values are never uploaded to a server. See the Privacy Policy for full details.
What developer tools are available right now? Log Sanitizer, HTTP Security Headers Analyzer, JSON Formatter, and CIDR Calculator are live today. See Available Tools above.
Does DevCraftKit have security tools? Yes. The Security category includes the live Log Sanitizer and HTTP Security Headers Analyzer, with a Secret Scanner, JWT tools, Password Generator, Hash Generator, and SSL Certificate Viewer planned.
Does DevCraftKit have networking tools? Yes. The CIDR Calculator is live, with DNS Lookup, IP Calculator, WHOIS Lookup, Subnet Mask Calculator, Port Checker, and User Agent Parser planned.
Can I use DevCraftKit for DevOps tasks? DevCraftKit's DevOps category is planned, covering a Regex Tester, Cron Builder, Docker Compose Validator, Kubernetes YAML Validator, and Nginx Config Validator.
Are more tools being added? Yes. DevCraftKit currently presents about 30 tools across its six categories, with new tools added regularly. See the All Tools page for current status.
- Software developers
- Web developers (frontend and backend)
- DevOps engineers and SREs
- Security engineers and cybersecurity researchers
- Network engineers
- System administrators
- Students learning development
- Technical teams that share logs, configs, and diagnostics day to day
DevCraftKit isn't trying to be an all-in-one platform. It's built around small, focused tools for real developer tasks — each one designed to do a single job well, run quickly, and respect the data you give it. The guiding principles are simplicity, speed, privacy, accessibility, and fitting naturally into everyday developer workflows.
- 🌐 DevCraftKit Website
- 🧰 All Tools
- 📂 Categories
- 🔐 Security Tools
- ⚙️ DevOps Tools
- 🌐 Networking Tools
- 🧩 JSON & Data Tools
- 🔤 Encoding Tools
- 📚 Learning Center / Blog
- ℹ️ About
- 🔒 Privacy Policy
Try the tools directly in your browser — free, private, and no sign-up required.
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