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matte

Developer

JSON, encoding, hashes, regex.19 tools

JSON

Format, validate, and explore JSON.

Base64

Encode and decode Base64, instantly.

URL Encoder

Encode, decode, and parse URLs.

JWT Decoder

Decode and inspect JWT tokens.

UUID / ULID

Generate UUIDs, ULIDs, and Nano IDs.

Test Credit Card Numbers

Luhn-valid card numbers for testing checkouts.

IBAN & BIC Generator

Valid test IBANs and BICs for 70+ countries.

Mock Data Generator

Realistic fake rows as JSON, CSV or SQL.

Hash

SHA, MD5, CRC32 — file or text.

Regex Tester

Test and explore regular expressions.

Cron Expression

Read and generate cron expressions.

What Is My IP

Your public IP and connection, read from the edge.

JSON to TypeScript

Types, Zod schemas and structs from any JSON.

Data Converter

JSON ↔ YAML ↔ TOML ↔ CSV.

Code Formatter

Prettier for JS, TS, CSS, HTML, and more.

Meta Tags

Generate SEO and Open Graph tags.

CSV Viewer

View, sort, and filter CSV files.

Chmod Calculator

File permissions, visually.

HTTP Status Codes

Every HTTP status explained.