construction 53 tools

Developer tools

Utilities for the things that interrupt the actual work. Every one of them is computed by your own browser: no request leaves this page, so nothing you paste is written down anywhere — no account, no history, no server log.

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format_align_left Format & minify 7 swap_horiz Convert 15 lock Encode & decode 8 auto_awesome Generate 14 travel_explore Inspect & compare 9

format_align_left

Format & minify

Make unreadable output readable again, or squeeze it back down.

Format, minify and validate JSON payloads.

Re-indent HTML, or strip it down to one line.

Re-indent minified or hand-mangled CSS.

JavaScript Beautifier

Unpack minified JavaScript into something readable.

Indent XML and check that it parses.

Break a one-line query onto readable lines.

GraphQL Formatter

Indent a GraphQL query or schema.

swap_horiz

Convert

One notation into another, without a round trip through a spreadsheet.

Turn a spreadsheet export into objects, and back.

Read a config file as JSON, or write one from it.

Binary, octal, decimal and hex, all at once.

camelCase, snake_case, kebab-case and slugs.

Color Converter

HEX, RGB and HSL with a contrast check.

Unix time to date and back, in both directions.

/tools/timestamp

Turn a curl command into fetch, axios or PHP.

Generate TypeScript, Go or PHP types from JSON.

Convert between .env files and JSON.

Image to Data URI

Inline an image or SVG as a Base64 data URI.

Chmod Calculator

Translate rwx permissions to octal and back.

Query String ↔ JSON

Parse and build URL query strings.

/tools/querystring

Convert between px and rem at a base size.

Bytes, KB, MB, GB — decimal and binary.

Convert Roman numerals to numbers and back.

lock

Encode & decode

Everything that has to survive being put inside something else.

Encode and decode Base64, including Unicode text.

Percent-encode strings and split query parameters.

Escape markup so it shows up as text.

/tools/entities

Read the header and payload of a token.

Escape text to \uXXXX and back.

Encode and decode RFC 4648 Base32.

Convert internationalised domains to ASCII.

/tools/punycode

Sign an HS256/384/512 token with a secret.

/tools/jwtencode

auto_awesome

Generate

Values you need right now and do not want to invent by hand.

MD5, SHA-1, SHA-256 and SHA-512 from any text.

Sign a message with a shared secret.

Bulk UUID v4 from the system CSPRNG.

Password Generator

Strong passwords with a live entropy estimate.

/tools/password

Placeholder copy in paragraphs, sentences or words.

Generate a QR code and save it as PNG.

Random numbers in a range, with or without repeats.

Generate rows of fake users as JSON or CSV.

Generate ULIDs and NanoIDs in bulk.

Build a .gitignore from common stacks.

/tools/gitignore

Build a CSS box-shadow with a live preview.

Design a CSS easing curve.

Luhn / Test Cards

Validate card numbers and generate test ones.

Build a gradient with a live preview.

/tools/gradient

travel_explore

Inspect & compare

Figure out what a string, a pattern or a diff actually says.

regular_expression

Match, highlight and pull out capture groups.

Line-by-line difference between two texts.

Explain a cron expression and preview its next runs.

Count, sort, deduplicate and trim lines.

JSONPath Tester

Query a JSON document with a path.

/tools/jsonpath

Look up any HTTP status code.

User-Agent Parser

Break a User-Agent string into parts.

/tools/useragent

CIDR Calculator

Network, broadcast and host range from a CIDR.

Character Inspector

Code points, bytes and entities of any text.

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