djwt
Create and verify JSON Web Tokens with deno.
API
Please use the
Web Crypto API’s
method generateKey
to generate a secure CryptoKey
.
const key = await crypto.subtle.generateKey(
{ name: "HMAC", hash: "SHA-512" },
true,
["sign", "verify"],
);
create
Takes Header
, Payload
and CryptoKey
and returns the url-safe encoded
jwt
.
import { create } from "https://deno.land/x/djwt@$VERSION/mod.ts";
const jwt = await create({ alg: "HS512", typ: "JWT" }, { foo: "bar" }, key);
verify
Takes jwt
and CryptoKey
and returns the Payload
of the jwt
if the jwt
is valid. Otherwise it throws an Error
.
import { verify } from "https://deno.land/x/djwt@$VERSION/mod.ts";
const payload = await verify(jwt, key); // { foo: "bar" }
decode
Takes a jwt
and returns a 3-tuple
[header: unknown, payload: unknown, signature: Uint8Array]
if the jwt
has a
valid serialization. Otherwise it throws an Error
.
import { decode } from "https://deno.land/x/djwt@$VERSION/mod.ts";
const [header, payload, signature] = decode(jwt);
getNumericDate
This helper function simplifies setting a
NumericDate. It takes either a
Date
object or a number
(in seconds) and returns the number of seconds from
1970-01-01T00:00:00Z UTC until the specified UTC date/time.
// A specific date:
getNumericDate(new Date("2025-07-01"));
// One hour from now:
getNumericDate(60 * 60);
Claims
Expiration Time (exp)
The optional exp claim in the payload identifies the expiration time on or after which the JWT must not be accepted for processing. Its value must be a number containing a NumericDate value. This module checks if the current date/time is before the expiration date/time listed in the exp claim.
const jwt = await create(header, { exp: getNumericDate(60 * 60) }, "secret");
Not Before (nbf)
The optional nbf (not before) claim identifies the time before which the jwt must not be accepted for processing. Its value must be a number containing a NumericDate value.
Algorithms
The following signature and MAC algorithms have been implemented:
- HS256 (HMAC SHA-256)
- HS384 (HMAC SHA-384)
- HS512 (HMAC SHA-512)
- RS256 (RSASSA-PKCS1-v1_5 SHA-256)
- RS384 (RSASSA-PKCS1-v1_5 SHA-384)
- RS512 (RSASSA-PKCS1-v1_5 SHA-512)
- PS256 (RSASSA-PSS SHA-256)
- PS384 (RSASSA-PSS SHA-384)
- PS512 (RSASSA-PSS SHA-512)
- none (Unsecured JWTs).
Serialization
This application uses the JWS Compact Serialization only.
Specifications
Contribution
Every kind of contribution to this project is highly appreciated. Please run
deno fmt
on the changed files before making a pull request.
Big Thank you to timreichen and all the other amazing contributors.