Free Online Developer Tools

Format and convert JSON, generate Go, Python or Java from JSON, format SQL and HTML, test regex, decode JWTs, work out CIDR, make hashes and HMACs — free.

49 tools

JSON

JSON FormatterFormat, minify and validate JSON JSON RepairAutomatically fix broken JSON JSON CompareFind the differences between two JSON documents JSON ViewerView JSON as a tree, collapse or expand any branch JSON SorterSort JSON fields and arrays from A to Z JSONPath QueryExtract data from JSON with a JSONPath expression JSON to YAMLConvert between JSON and YAML JSON to TOMLConvert between JSON and TOML JSON to CSVConvert between JSON and CSV tables JSON to XMLConvert JSON to indented XML JSON to TypeScriptGenerate TypeScript interfaces from sample JSON JSON to JSON SchemaGenerate a JSON Schema from a JSON sample JSON Schema validatorCheck whether JSON data matches a JSON Schema JSON to ZodGenerate a Zod schema from a JSON sample JSON to Go structGenerate Go structs from a JSON sample JSON to Python dataclassGenerate dataclasses or Pydantic models from JSON JSON to Java classGenerate Java classes or records from JSON JSON to Kotlin data classGenerate Kotlin data classes from a JSON sample JSON Escape / UnescapeTurn text into a valid JSON string and back

Code formatters

HTML formatterBeautify HTML code with clean indentation CSS formatterBeautify CSS, SCSS and Less code JavaScript formatterBeautify JavaScript, JSX and TypeScript code SQL formatterMake SQL queries easy to read

Network & web

URL parserSplit a link into parts and edit its query User-Agent parserFind browser, OS and device from a user agent CIDR CalculatorNetwork details of an IPv4 or IPv6 CIDR block Subnet CalculatorSplit an IPv4 network into subnets, VLSM too MIME Type LookupLook up MIME types and check a file's real type

Security

Hash generatorGenerate MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes HMAC GeneratorCreate and verify HMAC signatures RSA EncryptionGenerate RSA keys, encrypt and decrypt short text Password GeneratorCreate strong random passwords Password strength checkerCheck if a password is weak or strong, and why

Dev Utilities

Base64 & URL Encoder / DecoderEncode and decode Base64 and URLs Data URI GeneratorTurn files and SVG into embeddable data URIs Data URI DecoderView and save files from a data URI or Base64 Slug generatorTurn titles into clean URL slugs UUID generatorGenerate random UUID identifiers Color converterConvert between HEX, RGB and HSL color codes Regex testerTest a regex: highlighted matches, groups and replace Regex generatorReady-made regex for email, phone, dates and more Regex explainerUnderstand every part of a regex Cron expression generatorPick a schedule, get the cron expression Cron expression parserRead a cron expression and see when it runs JWT decoderRead a JWT's header, payload, expiry and check its signature JWT generatorSign a JWT with a secret or a private key Markdown previewType Markdown, preview it live and get the HTML HTML to MarkdownTurn HTML or copied content into Markdown Unix timestamp converterTimestamp ⇄ date, with the current epoch time