About Developer Tools

Regex tester, JSON diff, JWT debugger, cron and chmod calculators

Developer tools are the daily utilities that save engineers minutes (and sometimes hours) on every task. ToolsRift offers 40+ developer tools that cover the most common debugging and reference needs: regex tester with live highlighting, JSON diff and merge, JWT debugger with header/payload inspection, cron expression builder and explainer, chmod calculator (visual permissions builder), URL parser, query-string builder, IP and CIDR calculators, MAC address lookup, timezone converter, Unix timestamp converter, color picker from screenshot, mock data generator and many more.

Each tool is designed for the workflow it supports. The regex tester highlights matches and capture groups live as you type; the cron explainer translates `0 9 * * 1-5` into "every weekday at 9am"; the chmod calculator lets you click checkboxes to build a permission octal. The JSON diff shows additions, removals and modifications with line-level coloring.

All tools run in your browser. No data — production tokens, internal IPs, real cron schedules — is ever sent to a server.

Why ToolsRift

Why our developer tools are different

Developer tools often deal with sensitive inputs: JWT tokens contain session info, JSON diffs may include PII from API responses, IP calculators reveal network topology. Most online dev tools either log or could log these inputs. ToolsRift runs every dev tool entirely client-side and we explicitly do not log any input content — only standard page-view analytics, which see URLs and nothing else.

Beyond privacy, our dev tools are designed for the common cases professional engineers actually hit. The regex tester supports JS, PCRE and POSIX flavors and explains the difference. The cron tool covers Quartz extensions used by Spring and other schedulers, not just the standard Unix syntax. The JWT debugger highlights known claim names (iat, exp, sub) and warns about common mistakes like an expired token.

How It Works

How to use developer tools

1
Pick the tool
Open the devtools dashboard and pick the utility you need — regex, JSON diff, JWT, cron, chmod, etc.
2
Paste or input your data
Drop your regex pattern, JSON payloads, cron expression, or other input. Live highlighting and parsing start immediately.
3
Inspect results
Each tool produces clear, annotated output — match highlights for regex, line-level diff for JSON, plain English for cron expressions.
4
Copy or share
One-click copy. Most tools also offer share URLs that encode your input — useful for posting in Slack or asking for help from a teammate.
Use Cases

Who uses developer tools?

From everyday tasks to professional workflows — here are some of the most common ways people use these tools.

›Backend engineers testing regex patterns for validation rules
›API engineers diffing two responses to find regression bugs
›Auth engineers inspecting JWT structure and claim contents
›DevOps engineers building and explaining cron expressions
›System admins calculating chmod octal from desired permissions
›Network engineers computing subnet ranges from CIDR notation
›Anyone converting Unix timestamps to readable dates across time zones
FAQ

Frequently Asked Questions

Answers to common questions about our developer tools.

Does the regex tester support PCRE features?+
Yes — PCRE, JavaScript and POSIX flavors are all supported, with clear notes about which features are flavor-specific (lookbehind, named groups, possessive quantifiers). The tool warns if your pattern uses a feature unavailable in your chosen flavor.
Can I diff really large JSON files?+
Yes. The JSON diff handles files up to several megabytes with line-level comparison and side-by-side display. For multi-megabyte files, the diff may take a second or two — but nothing is truncated.
Does the JWT debugger verify signatures?+
It decodes and displays the header and payload (which are public Base64-encoded JSON), and validates the structure. It does not verify the signature, because verification requires the issuer's secret or public key — which we do not collect. For local debugging, this is exactly the right behavior.
What cron syntax does the explainer support?+
Standard 5-field Unix cron (minute, hour, day-of-month, month, day-of-week), with extensions: 6-field (with seconds), 7-field (with year), special strings (@daily, @hourly), Quartz syntax used by Spring schedulers, and step values. The explainer outputs both English and the next 5 firing times.
Can I use the chmod calculator for Windows ACLs?+
No — chmod is a Unix/Linux concept. The calculator builds octal and symbolic chmod representations (rwxr-xr-x = 755) for Linux, macOS and similar systems. Windows uses a separate ACL model that does not map cleanly to chmod.
Explore More

Related tool categories

Continue exploring ToolsRift with these related tool collections.

JSON Tools →
Format, validate, minify, diff and convert JSON to CSV, YAML, XML.
Encoders & Decoders →
Base64, URL, HTML entity, JWT and hex encoders and decoders.
Hash & Crypto →
MD5, SHA-256, HMAC, bcrypt, UUID and other cryptographic tools.
Dev Config →
.gitignore, Dockerfile, nginx, package.json and .env templates.
Code Formatters →
Beautify CSS, SQL, XML, YAML, Markdown and 20+ more languages.