Developer

Browse 50 Murelio browser utilities for code and data utilities. Open each focused tool immediately without installing software or creating an account.

• JSON Formatter

  Parse JSON and serialize it again with two-space indentation.

• JSON Minifier

  Parse valid JSON and reserialize it without formatting whitespace.

• JSON Validator

  Check whether the input can be parsed by JavaScript JSON.parse.

• JSON Path Explorer

  Query one JSON value using dot notation, array indexes, and quoted keys.

• JSON to CSV

  Convert an array of JSON objects into CSV-like text using the union of all object keys as columns.

• CSV to JSON

  Convert CSV text to a JSON object array using the header row as property names.

• YAML to JSON

  Parse YAML with the yaml package and serialize the resulting value as two-space JSON.

• JSON to YAML

  Parse valid JSON and generate YAML with the yaml package's YAML.stringify.

• XML Formatter

  Validate XML with the browser XML parser and insert line breaks between adjacent tags.

• XML Minifier

  Remove whitespace between XML tags and trim the surrounding text for a compact form.

• XML Validator

  Parse XML with DOMParser and check whether a parsererror node is produced.

• XML to JSON

  Recursively convert an XML element tree into a simple JSON object keyed by tag names.

• HTML Formatter

  Format HTML with Prettier standalone's html parser.

• CSS Formatter

  Format CSS with Prettier standalone and the PostCSS parser plugin.

• JavaScript Formatter

  Format JavaScript with Prettier standalone's Babel parser.

• TypeScript Formatter

  Format TypeScript with Prettier standalone's TypeScript parser.

• SQL Formatter

  Lightly format SQL by collapsing whitespace and inserting line breaks before selected keywords.

• Base64 Encoder

  Encode text as UTF-8 bytes and then convert those bytes to Base64.

• Base64 Decoder

  Decode standard Base64 bytes and interpret them as UTF-8 text.

• URL Encoder

  Percent-encode text using JavaScript encodeURIComponent rules for a URL component.

• URL Decoder

  Decode a percent-encoded URL component with JavaScript decodeURIComponent.

• HTML Entity Encoder

  Escape text for HTML text content by assigning it to a DOM element's textContent and reading innerHTML.

• HTML Entity Decoder

  Decode HTML entities by assigning the input to a textarea's innerHTML and reading its value.

• Unicode Escape Converter

  Convert each Unicode code point into a JavaScript-style Unicode escape string.

• Hex Encoder

  Encode text as UTF-8 bytes and concatenate each byte as two lowercase hexadecimal digits.

• Hex Decoder

  Validate hexadecimal byte text, convert it to bytes, and decode those bytes as UTF-8.

• Gzip Size Estimator

  Compress the input text with the browser CompressionStream gzip implementation and report the resulting byte size.

• JWT Decoder

  Decode the Base64URL header and payload of a three-part JWS JWT and display common time claims readably.

• UUID Validator

  Check whether a string matches the 8-4-4-4-12 hexadecimal UUID shape with supported version and variant bits.

• IP Address Validator

  Strictly parse an IPv4 or IPv6 address and show a normalized representation when valid.

• CIDR Subnet Calculator

  Calculate network, subnet mask, broadcast, first/last usable addresses, and address counts from IPv4/CIDR input.

• IPv4 to Integer

  Convert a valid IPv4 address to its 32-bit unsigned integer value.

• Integer to IPv4

  Convert an integer from 0 to 4294967295 into a network-order dotted IPv4 address.

• MAC Address Formatter

  Extract the twelve hexadecimal digits of a MAC address and reformat them as six two-digit groups with a chosen separator.

• HTTP Status Lookup

  Look up a typed HTTP status code in the tool's built-in set of common reason phrases.

• MIME Type Lookup

  Look up a file extension in a built-in map of common MIME types.

• User Agent Parser

  Heuristically infer browser, version, OS, device class, engine, and bot status from a User-Agent string.

• URL Parser

  Parse a URL with the browser URL API and display protocol, host, hostname, port, pathname, search, hash, and username as JSON.

• Query String Parser

  Parse a full URL or query string with URLSearchParams and show both original parameter order and grouped JSON values.

• Cron Expression Explainer

  Validate a standard five-field cron expression, show its fields, and calculate up to five upcoming runs in the browser time zone.

• Unix Permission Calculator

  Convert Unix permissions between three-digit octal and nine-character rwx notation.

• Semantic Version Compare

  Parse and compare two Semantic Versions using SemVer 2.0.0 precedence rules.

• Design Token Generator

  Generate a small CSS custom-property token block containing a chosen primary color.

• CSS Unit Converter

  Convert px and rem in either direction using a user-specified root font size.

• Data URI Generator

  Build a text data: URL using a chosen MIME type, charset, and either percent encoding or Base64.

• Text Hash Generator

  Hash the UTF-8 bytes of input text with Web Crypto and return a lowercase hexadecimal digest.

• HMAC Generator

  Create an HMAC signature from a message and secret key with Web Crypto and display it as hexadecimal.

• Checksum Calculator

  Apply a selected SHA digest to text and return a hexadecimal value for checksum-style comparison.

• SQL IN List Builder

  Turn newline- or comma-separated values into SQL IN (...) literal syntax.

• JSON Schema Generator

  Infer a starter JSON Schema recursively from the observed types and nested structure of a JSON sample.