Developer utilities

Developer Generators

Generate development and test data, create random identifiers and synthetic technical values, and work with common encoding, formatting, and network-data formats. These utilities produce local test material and do not provision real credentials or production resources.

Choose a developer tool

Pick the utility that matches the technical value or transformation you need.

Keys and identifiers

Create synthetic key material, tokens, and standards-based identifiers for systems you control.

API Key Generator

Generate synthetic random key material for systems you control; it does not provision third-party credentials.

JWT Generator & Decoder

Generate synthetic HS256 JWTs or decode JWT headers and payloads locally in your browser.

Generate random UUID v4 values for development, databases, APIs, testing, and sample data.

Generate random GUID values in standard GUID/UUID v4 format for development and testing.

Encoding and formatting

Format structured data, encode or decode text representations, and calculate text digests.

JSON Formatter & Validator

Validate, format, and minify JSON locally in your browser with syntax feedback.

Base64 Encoder/Decoder

Encode text to Base64 or decode Base64 back to UTF-8 text in your browser.

Generate MD5, SHA-256, and SHA-512 hashes from text in your browser.

Network and technical data

Generate synthetic network values for fixtures, examples, local development, and QA.

MAC Address Generator

Generate locally administered unicast MAC addresses for networking, virtualization, testing, and sample data.

IPv4 Address Generator

Generate random IPv4 addresses with public, private, and filtered address options.

IPv6 Address Generator

Generate random IPv6 addresses with global unicast, unique local, link-local, documentation, compressed, and full notation options.

Which developer tool should I use?

Need random key material for a system you control? Use the API Key Generator.
Need an identifier? Choose the UUID Generator or GUID Generator.
Need encoded text? Use the Base64 Encoder/Decoder.
Need structured-data cleanup? Use the JSON Formatter & Validator.
Need a text digest? Use the Hash Generator.
Need network test data? Choose the MAC Address Generator, IPv4 Address Generator, or IPv6 Address Generator.

Popular Categories

Browse every generator category and live tool.

Location Generators

Free tools for generating addresses, countries, coordinates, cities, postcodes, ZIP codes, and location-style sample data.

Decision Generators

Free tools for random choices, things, sets, and everyday selection tasks.

Time & Date Generators

Free tools for generating random dates, times, days, months, and time-based results.