Stop pasting JWTs into jwt.io
Developers are advised against pasting JSON Web Tokens (JWTs) into jwt.io due to security risks. When a token is pasted, it is sent to a third-party server, which can log sensitive information. Instead, developers should decode JWTs locally in their browser to avoid exposing authentication credentials.
- ▪Pasting JWTs into jwt.io sends authentication credentials to a third-party server.
- ▪JWT payloads are Base64url-encoded and readable, which poses a risk if sensitive information is included.
- ▪Developers can use client-side decoders that run entirely in the browser to avoid network requests.
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Record
| Original publisher | DEV.to (Top) |
| Canonical URL | https://dev.to/rmb_37/stop-pasting-jwts-into-jwtio-12kn |
| Publication time | Wed, 03 Jun 2026 09:35:51 +0000 |
| Retrieval time | 2026-06-03T09:42:00.459Z |
| Last seen | 2026-06-03T09:42:00.459Z |
| 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 | jHN0ukJQEs7G |
| 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 === 3966227) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } rmb Posted on Jun 3 Stop pasting JWTs into jwt.io #javascript #security #tutorial #webdev You're debugging an authentication issue. The frontend is getting a 403. You copy the JWT from the Authorization header, open jwt.io in a new tab, paste it in, and check the claims. Most developers do this multiple times a week. I did too. The problem: jwt.io is a third-party website. When you paste a token there, you're sending your authentication credential to their servers.
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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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