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Developer Tools35 tools

Formatters, converters, testers and generators for everyday programming work.

JSON11

SQL to JSONConvert SQL INSERT to JSON arrayJSON to SQLGenerate SQL INSERT from JSON dataJSON to Go StructConvert JSON to Go data structuresJSON Schema GeneratorGenerate JSON Schema from JSON dataJSON to TypeScriptGenerate TS interfaces from JSONJSON ↔ TOMLConvert between JSON and TOML formatsJSON ↔ XMLConvert between JSON and XML formatsJSON DiffCompare and find differences in JSONJSON ↔ CSVConvert between JSON arrays and CSVJSON ↔ YAMLConvert data between JSON and YAML formatsJSON FormatterFormat and beautify JSON data

JWT1

JWT DebuggerDecode and inspect JSON Web Tokens to view headers and payloads

Regex1

Regex TesterTest regular expressions against sample text with match highlighting

Cron1

Crontab GeneratorCreate and understand cron expressions

Docker1

Docker Run to ComposeConvert docker run to docker-compose.yml

SQL1

SQL PrettifyFormat and beautify your SQL queries

YAML, XML & TOML2

YAML Viewer & FormatterBeautify and sort YAML dataXML FormatterFormat and beautify XML data

HTML3

HTML EntitiesEncode and decode HTML entitiesHTML EditorWrite and preview HTML with a live side-by-side editorHTML StripperRemove all HTML tags and convert content to plain text

Encoding2

URL Encoder/DecoderEncode and decode URL stringsBase64 ConverterEncode and decode text to and from Base64 format

Network & IP3

IP Range ExpanderExpand CIDR and IP ranges to listsHTTP Status CodesComplete reference for HTTP response codesSubnet CalculatorCalculate IPv4 subnets and CIDR masks

Device & Client3

Device InformationView hardware and browser detailsKeycode InfoFind keyboard event keycodes and infoUser Agent ParserDecode browser user agent strings

Reference3

MIME TypesLookup MIME types and file extensionsGit Cheat SheetCommonly used Git commands referenceChmod CalculatorCalculate Linux file permissions

Converters2

Curl to CodeConvert curl commands to JS, Python, GoSVG to JSXConvert SVG to React components

Other1

URL ParserBreak down complex URLs into parts

About developer tools

A working developer's toolbox: format and validate JSON, decode JWTs, test regular expressions, validate and explain cron expressions, convert curl commands and docker run lines, prettify SQL, generate TypeScript or Go types from JSON, inspect HTTP status codes and headers, and much more.

Nothing you paste — tokens, connection strings, production payloads — is sent to a server. Each tool runs locally, so it is safe to use with real data during debugging.

Frequently asked questions

Is it safe to paste a production JWT or API key here?
Yes. Decoding and formatting happen in your browser only; nothing is transmitted. Still, avoid pasting live secrets on shared or public machines.
Do the tools work offline?
Once a tool page has loaded it keeps working without a connection, because all processing is client-side.