Developer Data Tools
Browse Tools
Code tool

Barcode Generator

Generate Code 128-B barcode SVGs for test labels and form payloads in the browser.

Tool Workspace

This tool runs in your browser. Developer Data Tools does not save pasted input to a server, but avoid using production secrets, access tokens, private keys or sensitive business data in any online page.

Ready. Processing runs in your browser.

Core Features

  • Transform pasted input locally.
  • Copy generated output.
  • Inspect small examples quickly.
  • Avoid server-side processing.

Common Errors

  • Using generated output without validating it in the target system.
  • Pasting sensitive production data into any online page.
  • Expecting lightweight browser tools to replace project-specific validation.

Real Developer Use Cases

  • Preparing test fixtures.
  • Debugging copied payloads.
  • Checking examples for documentation.
JSON Formatter & Validator

Format and validate copied API responses.

Text Diff Checker

Compare generated output and source snippets.

Base64 Encoder/Decoder

Inspect encoded data fragments.