A developer workbench that stays on your machine

18 tools for JSON, text, tokens, cryptography, and more. Every one of them parses and transforms your data locally in the browser — nothing you paste or upload leaves this tab.

JSON

Format, validate, query, and convert JSON.

JSON FormatterFormat, minify, validate, and explore JSON with a tree and raw view.JSON → YAMLConvert JSON documents to YAML, preserving structure and types.YAML → JSONConvert YAML, including multi-document files, to JSON.

CSV & Data

Work with tabular data in the browser.

JSON → CSVFlatten a JSON array of objects into a CSV or TSV file.CSV → JSONParse a CSV or TSV file into JSON, with delimiter detection and a table preview.

Text

Diff, transform, and inspect text.

Case ConverterConvert text between camelCase, snake_case, kebab-case, Title Case, and more.Text DiffCompare two pieces of text with line, word, and character level diffing.

Regex

Test and debug regular expressions.

Regex TesterTest JavaScript regular expressions with live match, group, and replace output.

Encode / Decode

Base64, URL, and binary encodings.

Base64 EncodeEncode text or files to Base64 and Base64URL entirely in your browser.Base64 DecodeDecode Base64 and Base64URL text back to its original form or a file.URL ToolsEncode, decode, and break a URL down into its components and query string.

Crypto & Security

Hashes, checksums, and encryption primitives.

Hash GeneratorGenerate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes of text or files.

Tokens & Authentication

JWT, JWK, and OAuth helpers.

JWT DecoderDecode a JSON Web Token, inspect claims, and verify HMAC signatures.

IDs & Random

Generate UUIDs, ULIDs, and secure randomness.

UUID GeneratorGenerate and inspect UUID v1/v3/v4/v5/v6/v7, ULID, and NanoID values in bulk.

Date & Time

Timestamps, timezones, and cron schedules.

Cron ParserExplain a cron expression in plain English and preview its next run times.Timestamp ConverterConvert between Unix timestamps, ISO 8601, and local or UTC dates.

Numbers

Base conversion and bitwise math.

Base ConverterConvert between binary, octal, decimal, and hexadecimal, with a bit viewer.

Web & Frontend

Color, CSS, and SVG utilities.

Color ToolsConvert colors between HEX, RGB, HSL, OKLCH, and LAB, and check WCAG contrast.