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node-jsonwebtoken
JsonWebToken implementation for node.js http://self-issued.info/docs/draft-ietf-oauth-json-web-token.html
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Some verify functions such as the popular Auth0 node-jsonwebtoken library requires the public key in PEM format. There are many libraries available to do this conversation.
This blog is focused on using a familiar and popular tool as a worked example for how automatic signature verification of JWTs can happen. It is not about recommending you to or not to use tools like this. I do however want to pause for a second to remind you that jwt.io is an online tool. It does state that it runs in the client, but as ever you should never automatically trust online tools and always consider the risk / threat they pose.