What does JWT stand for?

JWT stands for JSON Web Token. It is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object.

How is JWT used in real applications?

When a user logs in, the server creates a JWT containing user information and sends it to the client. The client then includes this token in subsequent API requests (usually in the Authorization header). The server verifies the token signature to confirm the user identity without needing to store session data.

What are the three parts of a JWT?

A JWT consists of three parts separated by dots: the header (contains the token type and signing algorithm), the payload (contains the claims and user information), and the signature (ensures the token has not been altered).

Why is JWT better than sessions?

JWTs are stateless, meaning the server does not need to store session data. This makes them ideal for distributed systems, microservices, and scalable applications. However, both approaches have trade-offs depending on your use case.

JWT itself is secure if implemented correctly. The signature prevents tampering, but you must transmit it over HTTPS, set appropriate expiration times, and store it securely (e.g., in httpOnly cookies). Security depends on the entire implementation, not just JWT alone.

JWT meaning in tech — Speak Tech English

Commonness	4/5
Versatility	4/5
Formality	CasualFormalNeutral
Spoken ↔ Written	SpokenWrittenBoth
Directness ↔ Diplomatic	DirectDiplomaticDirect
Region	US and UK

Say it like this

✓We need to validate the JWT on the backend

✓The JWT expires after one hour

✓Store the JWT securely in localStorage

Real examples

in a standup

"Yesterday we fixed an issue where the JWT was not being refreshed correctly, so users got logged out unexpectedly."

in a code review

"Make sure you are verifying the JWT signature before trusting any claims in the token."

in a team meeting

"We decided to implement JWT-based authentication instead of traditional server-side sessions to scale better."

Don't say this

Handle with care. JWT is a technical standard, not a verb or action. Do not use it as 'JWTing' or as a general security measure. It is specifically for stateless authentication tokens.

✕We are JWTing the system now.

✓We are implementing JWT authentication.— JWT is a token format, not a verb. You implement JWT, verify JWT, or decode JWT, but you do not JWT something.

✕Store the JWT in a public cookie without encryption.

✓Store the JWT in a secure, httpOnly cookie.— JWTs should be stored securely to prevent unauthorized access. Security measures matter when handling tokens.

✕The JWT handles all security needs.

✓JWT is one part of a complete authentication and authorization strategy.— JWT is a token mechanism, not a complete security solution. Additional measures like HTTPS and input validation are necessary.

Other forms

abbreviation

JWT

"The JWT contains user information encoded in three parts."

noun

JSON Web Token

"A JSON Web Token is a stateless way to authenticate users."

Often used with

generate a JWTto create and issue a new token to a user

verify the JWTto check the signature and validate the token authenticity

decode the JWTto read and extract the information inside the token

JWT expirationthe time limit after which the token is no longer valid

JWT payloadthe part of the token containing the user claims and data

Similar words

tokenBroader term; JWT is a specific type of token used for authentication.

bearer tokenA general term for tokens used in HTTP Authorization headers; JWT is one form of bearer token.

Opposites

session-based authenticationserver-side sessions

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Practice

Try it

4 quick exercises

Pick the most natural phrasing

1. How would you naturally say this in a tech meeting?

We need to verify the JWT signature on every request.We need to JWT the signature on every request.We need to check that JWT happens on every request.We need to make JWT work on every request.

Complete the sentence

2. When the user logs in, the server generates a _______ and sends it to the client for authentication.

Spot the mistake

3. Which sentence uses JWT incorrectly?

The API requires a valid JWT in the Authorization header.We are JWTing the authentication process.The JWT payload contains user identification information.You need to decode the JWT to read its claims.

Rewrite naturally

4. Rewrite this using 'JWT': 'The system uses a method where the server sends a special code to the user, and the user sends that code back to prove who they are.'

Questions

Quick poll

Have you said "jwt" in a standup this week?

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JWT

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