Developer Utilities tools

Developer helpers for regex, git, permissions, and code analysis

8 tools availableRuns in your browser

Test regular expressions
Analyze code complexity
Lookup MIME types and keycodes
Generate permissions and configs
Browser-based processing
Free to use

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Top Developer Utilities tools

All 8 tools in Developer Utilities →

Developer UtilitiesFeatured

Regex Tester

Test and debug regular expressions with live matching and capture groups. Paste pattern and sample text.

Developer Utilities

JSON Path Finder

Find JSONPath expressions by clicking any key. Use when querying APIs; for formatting use json-formatter. Input: JSON ≤10MB. Returns matching paths and values. 100% client-side.

Developer Utilities

Git Cheatsheet

Search common git commands with examples. Use as quick reference; for regex help use regex-memo. Input: search text. Returns command snippets. 100% client-side.

Developer Utilities

Regex Cheatsheet

Quick regex syntax cheatsheet with examples. Use when looking up syntax; for live testing use regex-tester. Input: search text. Returns pattern snippets. 100% client-side.

Developer Utilities

MIME Types Lookup

Look up MIME types by extension and vice versa. Use when configuring uploads; for file checksums use file-checksum. Input: extension or MIME. Returns MIME mapping. 100% client-side.

Developer Utilities

Chmod Calculator

Calculate chmod permissions from checkboxes or octal. Use when setting file modes; for git perms use git-cheatsheet. Input: mode or ticks. Returns octal and symbolic. 100% client-side.

Developer UtilitiesFeatured

Regex Tester

Test and debug regular expressions with live matching and capture groups. Paste pattern and sample text.

Test regular expressions with live matches
Capture groups and detailed match info
Configurable flags
+1 more

Developer Utilities

JSON Path Finder

Find JSONPath expressions by clicking any key. Use when querying APIs; for formatting use json-formatter. Input: JSON ≤10MB. Returns matching paths and values. 100% client-side.

Query JSON with JSONPath expressions
Extract matching values instantly
Highlight matched locations
+1 more

Developer Utilities

MIME Types Lookup

Look up MIME types by extension and vice versa. Use when configuring uploads; for file checksums use file-checksum. Input: extension or MIME. Returns MIME mapping. 100% client-side.

Look up MIME types by file extension
Reverse lookup by MIME type
Searchable reference table

Developer Utilities

Keycode Info

Show key code and key name for any pressed key. Use when debugging shortcuts; for regex keys use regex-tester. Input: key press. Returns code details. 100% client-side.

See live key, code, and location values
Reference table for common keys
Works without a mouse

Developer Utilities

Chmod Calculator

Calculate chmod permissions from checkboxes or octal. Use when setting file modes; for git perms use git-cheatsheet. Input: mode or ticks. Returns octal and symbolic. 100% client-side.

Convert between numeric and symbolic modes
Visual checkbox grid for permissions
Copy the chmod command

Developer Utilities

Git Cheatsheet

Search common git commands with examples. Use as quick reference; for regex help use regex-memo. Input: search text. Returns command snippets. 100% client-side.

Searchable Git command reference
Categorized commands with examples
Copy any command snippet

Developer Utilities

Regex Cheatsheet

Quick regex syntax cheatsheet with examples. Use when looking up syntax; for live testing use regex-tester. Input: search text. Returns pattern snippets. 100% client-side.

Regex pattern reference with examples
Searchable by purpose
Copy any pattern

Developer Utilities

Code Complexity Analyzer

Analyze cyclomatic complexity and code metrics. Use when reviewing quality; for formatting use js-minifier. Input: code ≤10MB. Returns complexity scores. 100% client-side.

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