CodingEasycod-g995

Subject CryptographyLevel Entry–Mid~12 minCommon in Security interviewsIndustries Software development

Question

Implement base64url encoding as used in JWTs and URL-safe tokens. Given a UTF-8 string `data`, return its base64url-encoded form: standard base64 but using '-' and '_' instead of '+' and '/', with all trailing '=' padding removed. An empty input encodes to an empty string.

Implement

base64url_encode(data: str) → str

Examples

in["hello"]out"aGVsbG8"

What a strong answer looks like

State your approach and its time/space complexity out loud before you optimize. Handle the edge cases (empty input, duplicates, overflow), and say why you chose this over the brute force. Green tests are the floor, not the grade.

Learn the concepts

Vibe coding: describe the solution in plain language (or narrate it) and the coach grades your approach. Generating runnable code from your description is coming next.

Run or narrate your approach, then ask the coach.