iLoveDevToolWhy look for a jwt.io alternative
When you have a token in front of you — pulled from a request header, a log line, an .env file — you usually just want to open it up: who issued it, is it expired, which claims does it carry. jwt.io is the default answer, recommended by most tutorials.
But opening the jwt.io debugger gives you more than a decoder: the page carries Auth0's product narrative, library ecosystem navigation, and content blocks beyond the tool itself. If you only want to read a token, prefer a non-English UI for your team, or hesitate to paste a production token into a third-party site, a lighter alternative makes sense.
How iLoveDevTool's JWT decoder does it
Our online JWT decoder does one job, directly:
- Paste to decode: the header, payload, and signature sections are formatted instantly, with no button to click;
- Local HS256 verification: enter the secret and the tool computes the HMAC-SHA256 comparison in your browser, showing whether the signature is valid — the secret never leaves your device;
- Human-readable time claims:
exp,iat, andnbfare converted to local time and ISO 8601, with a clear expired badge onexp— the most common question about a token answered on the page; - Multilingual: the interface, FAQ, and how-to are localized across 20 languages.
For everyday debugging, that covers the full set of reasons you'd open a JWT tool.
Where jwt.io is still better
Worth being direct: jwt.io is still better at a few things.
- Algorithm coverage: RS256, ES256, EdDSA, and other asymmetric algorithms work out of the box; our tool currently verifies HS256 only (decoding works for every algorithm), with asymmetric verification planned;
- Library ecosystem docs: jwt.io maintains navigation and examples for JWT libraries in nearly every language — something we don't do and don't intend to copy; we'd rather go deep on execution environments like our Python playground;
- A decade of mindshare: it's referenced in countless tutorials, and "verify it on jwt.io" is muscle memory for teams.
If you're verifying an RS256 token or looking up a language library, jwt.io is still the right choice.
How to choose
| Scenario | Recommendation |
|---|---|
| Quickly read a token's claims and expiry | Both work; pick iLoveDevTool for a lighter page and localized UI |
| HS256 verification | Both work; if you mind the secret leaving your device, pick the local-first iLoveDevTool |
| RS256 / ES256 asymmetric verification | jwt.io, for now |
| Library docs and signing examples | jwt.io (ecosystem docs) |
| Reproduce the verification logic in Python | iLoveDevTool: read the result in the tool, run code in the Python playground |
Frequently Asked Questions
Is jwt.io free to use?
Yes. jwt.io's debugger decodes and verifies tokens for free; its business model is built on Auth0 (now Okta) identity products, and the tool itself costs nothing. Beyond free, the page aggregates a large library ecosystem and carries Auth0 product messaging.
How is iLoveDevTool's JWT tool different from jwt.io?
Three core differences: the page is lighter with paste-and-read results and no marketing wrapper; the interface and docs are Chinese-first across 20 languages, with exp and iat claims shown as readable times; HS256 verification happens locally in your browser, so the secret never leaves your device. jwt.io's strengths are broader algorithm coverage (RS256 and friends out of the box) and a decade of library ecosystem docs.
Can both tools verify RS256 signatures?
jwt.io supports RS256 and other asymmetric algorithms. iLoveDevTool's JWT decoder currently verifies HS256 locally, with RS256 planned for a later release; if you need to verify an RS256 token right now, jwt.io remains the right choice.