ToolsForWeb

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toolsforweb

Web & Dev

Everyday utilities for building and debugging on the web: JSON formatting and diffing, regex testing, UUID generation, cron parsing, and format converters.

17 tools
JSON FormatterPopular

Pretty-print, minify and validate JSON, with the line and column of any syntax error.

JSON Schema Validator

Validate a JSON document against a Draft 2020-12 schema, with precise paths for every issue.

Regex Tester

Test a JavaScript regular expression against sample text with live match highlighting.

UUID Generator

Generate v1-v7 UUIDs (RFC 9562) or decode any UUID's version, variant and timestamp.

Cron Expression Parser

Explain a cron expression in plain English and show the next run times.

YAML / TOML Converter

Convert data between JSON, YAML and TOML, with line-and-column errors when input won't parse.

URL Parser

Break a URL into protocol, host, port, path, query parameters and fragment.

JSON to TypeScript

Turn a JSON document into TypeScript interfaces, with optional fields and unions.

SQL Formatter

Pretty-print SQL with dialect-aware keywords, indent and case options.

HTML Entity Encoder / Decoder

Escape text to HTML entities or decode them back, with two escape levels.

Chmod Calculator

Convert between octal (755) and symbolic (rwxr-xr-x) permissions, with special bits and umask.

Code Beautifier

Reformat HTML, CSS, JavaScript, TypeScript, JSON or Markdown with Prettier, entirely in your browser.

JSON Diff

Compare two JSON documents structurally and see added, removed and changed keys — order-independent.

XML Formatter

Pretty-print or minify XML, with the line and column of any parse error.

XML / JSON Converter

Convert XML to JSON or JSON to XML, with attributes and text nodes preserved.

docker run to Compose

Turn a long `docker run` command into an equivalent docker-compose.yml service.

px / rem Converter

Convert between px and rem for a given root font size, with a quick reference table.

About Web & Dev

Everyday utilities for building and debugging on the web. Format and validate JSON with the line and column of any syntax error, diff two JSON documents, validate against a JSON Schema, and generate TypeScript types from a sample payload. Convert between YAML, TOML, XML and JSON, and format SQL, XML, HTML, CSS and JavaScript.

For the rest of the day's small jobs: test regular expressions with live match highlighting, generate or decode UUIDs (v1, v4, v6 and v7), explain a cron expression and list its next runs, break a URL into its parts, encode HTML entities, work out chmod permissions, convert px to rem, and turn a docker run command into a Compose file. The tools run in your browser, so payloads and tokens you paste stay on your machine.

Questions

Is it safe to paste production JSON into the formatter?

The JSON tools run entirely in your browser and do not send your data anywhere, which you can confirm in your browser's network tab. Still, follow your organization's rules for handling secrets.

Which regex flavor does the regex tester use?

JavaScript's built-in RegExp engine, the same one used by browsers and Node.js, including named groups, lookbehind and the u, s, y and d flags.

Which UUID version should I use?

Use v4 for random identifiers and v7 when you want IDs that sort by creation time, which keeps database indexes compact. The generator also decodes any UUID to show its version and embedded timestamp.