--- title: "Blobster vs jwt.io: An Honest Comparison" description: "Compare Blobster and jwt.io for decoding JWTs: signature verification, token generation, claim explanations, privacy and where each fits in a debugging workflow." canonical: "https://www.mochavi.com/blobster/compare/jwt-io" markdown_mirror: "https://www.mochavi.com/blobster/compare/jwt-io.md" language: "en" generated_from: "prerendered HTML" --- > Canonical HTML: [https://www.mochavi.com/blobster/compare/jwt-io](https://www.mochavi.com/blobster/compare/jwt-io) > > This machine-readable Markdown mirror is generated from the canonical page during the Mochavi production build. [Blobster](https://www.mochavi.com/blobster) / [Comparisons](https://www.mochavi.com/blobster/compare) Comparison # Blobster or jwt.io: read a token, or check it. jwt.io decodes, verifies and generates JSON Web Tokens and explains registered claims. Blobster decodes a token inside a browser extension with no account or analytics, next to the rest of your debugging data, but it does not verify signatures. Use jwt.io to check a signature or build a test token. Use Blobster to read a live token you would rather not paste into a website. Published 14 October 2026 4 minute read By Mochavi [Install Blobster](https://chromewebstore.google.com/detail/blobster/epddolhfilamhbnmgglenceabjbbeeho) [Read as Markdown](https://www.mochavi.com/blobster/compare/jwt-io.md) Short answer Choose jwt.io when you need to verify a signature with a secret or a public key, or to generate a token. Choose Blobster when you only need the header and claims of a real token and want it to stay in a local extension. ## Key points - jwt.io verifies signatures with a shared secret or a public key in PEM or JWK form, and its encoder signs new tokens. - Blobster shows the decoded header and payload, readable `exp`, `iat` and `nbf` times, and warnings for expired tokens and `alg: none`. Signatures stay unverified. - jwt.io is presented by Auth0 and published under Okta’s copyright. Its privacy choices notice says personal information may be shared with third-party ad partners, for example through cookies. - Decoding needs no key. The risk in pasting a live token anywhere is the token itself, which works for whoever holds it until it expires. ## At a glance | Criterion | Blobster | jwt.io | | --- | --- | --- | | Decode header and payload | Yes, inside the extension | Yes | | Verify signature | No, shown as unverified | Yes, with a secret or a PEM or JWK public key | | Create or sign tokens | No | Yes, with the JWT Encoder | | Claim help | Readable `exp`, `iat` and `nbf`; warnings for expiry and `alg: none` | Claims breakdown with descriptions of registered claims | | Other data | JSON, YAML, HAR, NDJSON, OpenAPI and more in the same workbench | Focused on JWTs | | Account and tracking | No account, analytics or telemetry | No account needed; Okta’s privacy policy and cookie choices apply | ## Where jwt.io is stronger jwt.io answers the question Blobster leaves open: is this token genuine? Paste the token, add the secret or public key, and the debugger reports whether the signature verifies. Its encoder goes the other way and signs a new token from a header, a payload and a key, which helps when you build test fixtures. It also explains claims. The claims breakdown describes registered claims such as `at_hash`, `nonce` and `auth_time` and links to the specifications, and the site has an introduction to JWTs and a list of libraries for each language. ## Where Blobster is different Blobster is for reading the tokens that turn up while you debug something else: in a log line, a HAR capture, an API response or a config file. Paste or open the token and Blobster shows the header and payload, turns `exp`, `iat` and `nbf` into readable times, and warns when the token has expired or uses `alg: none`. It runs as a browser extension with no account, analytics, telemetry or share link, so a production token stays on your machine. In Chrome you can also select a token on a page, right-click and open it in Blobster. ## Decoding is not the sensitive part A signed JWT is encoded, not encrypted. jwt.io’s own introduction says the information in a signed token is readable by anyone and that secret information does not belong in the payload unless the token is encrypted. The sensitive part is the token itself. A bearer token works for whoever holds it until it expires or is revoked, so pasting a production token into any website means trusting that site with a working credential. Decoding it locally avoids the question. ## Use both, in order Read the claims locally first. Most questions, such as which audience, which scopes or when the token expires, end there. When you do need to check a signature, use jwt.io with a token from a test environment or one that has already expired, or verify it in code with one of the libraries jwt.io lists. ## Sources - [jwt.io debugger](https://www.jwt.io/) - [jwt.io introduction to JSON Web Tokens](https://www.jwt.io/introduction) - [jwt.io libraries](https://www.jwt.io/libraries) - [Okta privacy policy](https://www.okta.com/legal/privacy-policy/) - [RFC 7519: JSON Web Token](https://www.rfc-editor.org/rfc/rfc7519) - [Blobster privacy policy](https://www.mochavi.com/privacy/blobster) Related [Local JWT decoder→](https://www.mochavi.com/blobster/local-jwt-decoder)[Blobster vs CyberChef→](https://www.mochavi.com/blobster/compare/cyberchef) Machine-readable [Markdown version→](https://www.mochavi.com/blobster/compare/jwt-io.md) [Blobster RSS feed→](https://www.mochavi.com/blobster/feed.xml) Local-first workbench ## Inspect the data. Keep the document local. Open JSON, logs, tokens, configs and tables in Blobster without adding an account, telemetry or a public paste URL. [Install from Chrome Web Store](https://chromewebstore.google.com/detail/blobster/epddolhfilamhbnmgglenceabjbbeeho)