kit · JSON, YAML, JWT, Base64, regex and more, right in your browser

JSON

Validate, format or minify JSON. Errors show the line and column.

Indent Sort keys

Input

Output

JSON ↔ YAML

Converts both ways: either panel can be edited. Anchors and tags aren't supported.

JSON

YAML

JSON → TypeScript

Generates interfaces from a sample JSON. Keys missing from some array items come out optional.

Root name Use type instead of interface

JSON

TypeScript

JWT

Decodes a token's header and payload. The signature isn't verified.

Token

Header

Payload

Base64

Encodes and decodes UTF-8 text, including the URL-safe variant.

URL variant (- and _ without =)

Input

Output

URL

Encodes and decodes URL components and breaks an address down into its parts and parameters.

Input

Output

Timestamp

Converts between Unix timestamps and dates. Accepts seconds, milliseconds, microseconds, ISO 8601, 29/10/2026, 2026/10/29, "29 October 2026", RFC 2822 and more, with an optional time.

Input

Regex

Test JavaScript regular expressions with highlighted matches and groups.

Test text

Matches

Hash

SHA-1, SHA-256, SHA-384 and SHA-512 of a UTF-8 text, using Web Crypto.

Input

UUID

Generates random v4 UUIDs with crypto.randomUUID().

How many Uppercase

Output