feat: add Base64 Encoder / Decoder tool

[sg172003]

Problem Statement

Developers frequently need to encode and decode Base64 strings — for API payloads, image data, and authentication tokens. Currently there's no client-side tool in DevUtils for this.

Proposed Solution

Add a Base64 Encoder / Decoder page with:

• Encode plain text to Base64
• Decode Base64 back to plain text
• Handle URL-safe Base64 format
• Error state for invalid input
• Copy and download output
• Utility functions in src/utils/base64Utils.ts
• Unit tests in src/tests/base64Utils.test.ts

Alternatives Considered

Using an external library — not needed, btoa() and atob() are native browser APIs.

[saishreeanand05]

Hello, I'd like to work on this issue. I will be implementing Base64 encode/decode utilities using btoa/atob as suggested, and add the corresponding UI and tests. Please let me know if this approach is fine. I'd be happy to take this on

[sg172003]

Hi @saishreeanand05 — welcome and thanks for your interest! 🎉

Your approach sounds great. A few guidelines before you start:

• Fork the repo and create a branch named feat/base64-tool from main
• Add utility functions in src/utils/base64Utils.ts
• Add unit tests in src/__tests__/base64Utils.test.ts
• Follow the existing page structure — src/pages/JsonFormatter.tsx is a good reference
• All processing must be client-side only — no server calls
• Run npx vitest run and npm run build before opening the PR

Feel free to ask questions here if you get stuck. Looking forward to your questions and PR!