Why JWT Exists - What I Figured Out by Looking at Real Numbers
The article discusses the purpose and advantages of JSON Web Tokens (JWT) in authentication. It contrasts JWT with traditional session-based authentication, highlighting the inefficiencies of database lookups for each request. The author explains how JWT improves performance by allowing servers to verify user identity without constant database access.
- ▪JWT signing takes approximately 5ms, while traditional session authentication requires about 50ms for database lookups.
- ▪Using bcrypt for per-request authentication is inefficient due to its intentional slowness, which can lead to server overload.
- ▪JWT consists of three parts: header, payload, and signature, allowing for quick verification without database access.
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Story provenance
Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | DEV.to (Top) |
| Canonical URL | https://dev.to/vikrant_98a676bd9e7ba34/why-jwt-exists-what-i-figured-out-by-looking-at-real-numbers-4gm8 |
| Publication time | Wed, 03 Jun 2026 08:56:19 +0000 |
| Retrieval time | 2026-06-03T09:12:00.412Z |
| Last seen | 2026-06-03T09:12:00.412Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | Iq3oITjvvOKP |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3598769) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Vikrant Kumar Posted on Jun 3 Why JWT Exists - What I Figured Out by Looking at Real Numbers #webdev #programming #javascript #productivity When I first learned JWT, I thought it was just "a library to create tokens for authentication." I used it in every project. I knew how to use it. But I never understood why it exists, why it is designed the way it is, and why everyone uses it instead of other approaches.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at DEV.to (Top).
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