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Class: SignJWT

💗 Help the project

Support from the community to continue maintaining and improving this module is welcome. If you find the module useful, please consider supporting the project by becoming a sponsor.

The SignJWT class is used to build and sign Compact JWS formatted JSON Web Tokens.

This class is exported (as a named export) from the main 'jose' module entry point as well as from its subpath export 'jose/jwt/sign'.

Examples

Usage with a symmetric secret

const secret = new TextEncoder().encode(
  'cc7e0d44fd473002f1c42167459001140ec6389b7353f8088f4d9a95f2f596f2',
)
const alg = 'HS256'

const jwt = await new jose.SignJWT({ 'urn:example:claim': true })
  .setProtectedHeader({ alg })
  .setIssuedAt()
  .setIssuer('urn:example:issuer')
  .setAudience('urn:example:audience')
  .setExpirationTime('2h')
  .sign(secret)

console.log(jwt)

Usage with a private PKCS#8 encoded RSA key

const alg = 'RS256'
const pkcs8 = `-----BEGIN PRIVATE KEY-----
MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDCFg4UrY5xtulv
/NXKmL1J4qI1SopAfTNMo3X7p+kJO7plqUYjzaztcre1qfh0m33Sm1Q8oPbO/GpP
MU1/HgcceytgJ/b4UwufVVMl9BrMDYG8moDBylbVupFQS3Ly1L9i/iFG9Z9A9xzY
Zzf799A45bnvNXL6s2glzvjiRvfQ2NDF0anTcnZLcYtC7ugq1IMM+ihAcPfw8Qw2
chN/SmP4qAM+PKaQwagmU7doqmmyN9u38AfoYZ1GCFhEs5TBBT6H6h9YdHeVtiIq
1c+fl03biSIfLrV7dUBD39gBmXBcL/30Ya3D82mCEUC4zg/UkOfQOmkmV3Lc8YUL
QZ8EJkBLAgMBAAECggEAVuVE/KEP6323WjpbBdAIv7HGahGrgGANvbxZsIhm34ls
VOPK0XDegZkhAybMZHjRhp+gwVxX5ChC+J3cUpOBH5FNxElgW6HizD2Jcq6t6LoL
YgPSrfEHm71iHg8JsgrqfUnGYFzMJmv88C6WdCtpgG/qJV1K00/Ly1G1QKoBffEs
+v4fAMJrCbUdCz1qWto+PU+HLMEo+krfEpGgcmtZeRlDADh8cETMQlgQfQX2VWq/
aAP4a1SXmo+j0cvRU4W5Fj0RVwNesIpetX2ZFz4p/JmB5sWFEj/fC7h5z2lq+6Bm
e2T3BHtXkIxoBW0/pYVnASC8P2puO5FnVxDmWuHDYQKBgQDTuuBd3+0tSFVEX+DU
5qpFmHm5nyGItZRJTS+71yg5pBxq1KqNCUjAtbxR0q//fwauakh+BwRVCPOrqsUG
jBSb3NYE70Srp6elqxgkE54PwQx4Mr6exJPnseM9U4K+hULllf5yjM9edreJE1nV
NVgFjeyafQhrHKwgr7PERJ/ikwKBgQDqqsT1M+EJLmI1HtCspOG6cu7q3gf/wKRh
E8tu84i3YyBnI8uJkKy92RNVI5fvpBARe3tjSdM25rr2rcrcmF/5g6Q9ImxZPGCt
86eOgO9ErNtbc4TEgybsP319UE4O41aKeNiBTAZKoYCxv/dMqG0j4avmWzd+foHq
gSNUvR2maQKBgQCYeqOsV2B6VPY7KIVFLd0AA9/dwvEmgAYLiA/RShDI+hwQ/5jX
uxDu37KAhqeC65sHLrmIMUt4Zdr+DRyZK3aIDNEAesPMjw/X6lCXYp1ZISD2yyym
MFGH8X8CIkstI9Faf9vf6PJKSFrC1/HA7wq17VCwrUzLvrljTMW8meM/CwKBgCpo
2leGHLFQFKeM/iF1WuYbR1pi7gcmhY6VyTowARFDdOOu8GXYI5/bz0afvCGvAMho
DJCREv7lC/zww6zCTPYG+HOj+PjXlJFba3ixjIxYwPvyEJiDK1Ge18sB7Fl8dHNq
C5ayaqCqN1voWYUdGzxU2IA1E/5kVo5O8FesJeOhAoGBAImJbZFf+D5kA32Xxhac
59lLWBCsocvvbd1cvDMNlRywAAyhsCb1SuX4nEAK9mrSBdfmoF2Nm3eilfsOds0f
K5mX069IKG82CMqh3Mzptd7e7lyb9lsoGO0BAtjho3cWtha/UZ70vfaMzGuZ6JmQ
ak6k+8+UFd93M4z0Qo74OhXB
-----END PRIVATE KEY-----`
const privateKey = await jose.importPKCS8(pkcs8, alg)

const jwt = await new jose.SignJWT({ 'urn:example:claim': true })
  .setProtectedHeader({ alg })
  .setIssuedAt()
  .setIssuer('urn:example:issuer')
  .setAudience('urn:example:audience')
  .setExpirationTime('2h')
  .sign(privateKey)

console.log(jwt)

Usage with a private JWK encoded RSA key

const alg = 'RS256'
const jwk = {
  kty: 'RSA',
  n: 'whYOFK2Ocbbpb_zVypi9SeKiNUqKQH0zTKN1-6fpCTu6ZalGI82s7XK3tan4dJt90ptUPKD2zvxqTzFNfx4HHHsrYCf2-FMLn1VTJfQazA2BvJqAwcpW1bqRUEty8tS_Yv4hRvWfQPcc2Gc3-_fQOOW57zVy-rNoJc744kb30NjQxdGp03J2S3GLQu7oKtSDDPooQHD38PEMNnITf0pj-KgDPjymkMGoJlO3aKppsjfbt_AH6GGdRghYRLOUwQU-h-ofWHR3lbYiKtXPn5dN24kiHy61e3VAQ9_YAZlwXC_99GGtw_NpghFAuM4P1JDn0DppJldy3PGFC0GfBCZASw',
  e: 'AQAB',
  d: 'VuVE_KEP6323WjpbBdAIv7HGahGrgGANvbxZsIhm34lsVOPK0XDegZkhAybMZHjRhp-gwVxX5ChC-J3cUpOBH5FNxElgW6HizD2Jcq6t6LoLYgPSrfEHm71iHg8JsgrqfUnGYFzMJmv88C6WdCtpgG_qJV1K00_Ly1G1QKoBffEs-v4fAMJrCbUdCz1qWto-PU-HLMEo-krfEpGgcmtZeRlDADh8cETMQlgQfQX2VWq_aAP4a1SXmo-j0cvRU4W5Fj0RVwNesIpetX2ZFz4p_JmB5sWFEj_fC7h5z2lq-6Bme2T3BHtXkIxoBW0_pYVnASC8P2puO5FnVxDmWuHDYQ',
  p: '07rgXd_tLUhVRF_g1OaqRZh5uZ8hiLWUSU0vu9coOaQcatSqjQlIwLW8UdKv_38GrmpIfgcEVQjzq6rFBowUm9zWBO9Eq6enpasYJBOeD8EMeDK-nsST57HjPVOCvoVC5ZX-cozPXna3iRNZ1TVYBY3smn0IaxysIK-zxESf4pM',
  q: '6qrE9TPhCS5iNR7QrKThunLu6t4H_8CkYRPLbvOIt2MgZyPLiZCsvdkTVSOX76QQEXt7Y0nTNua69q3K3Jhf-YOkPSJsWTxgrfOnjoDvRKzbW3OExIMm7D99fVBODuNWinjYgUwGSqGAsb_3TKhtI-Gr5ls3fn6B6oEjVL0dpmk',
  dp: 'mHqjrFdgelT2OyiFRS3dAAPf3cLxJoAGC4gP0UoQyPocEP-Y17sQ7t-ygIanguubBy65iDFLeGXa_g0cmSt2iAzRAHrDzI8P1-pQl2KdWSEg9ssspjBRh_F_AiJLLSPRWn_b3-jySkhawtfxwO8Kte1QsK1My765Y0zFvJnjPws',
  dq: 'KmjaV4YcsVAUp4z-IXVa5htHWmLuByaFjpXJOjABEUN0467wZdgjn9vPRp-8Ia8AyGgMkJES_uUL_PDDrMJM9gb4c6P4-NeUkVtreLGMjFjA-_IQmIMrUZ7XywHsWXx0c2oLlrJqoKo3W-hZhR0bPFTYgDUT_mRWjk7wV6wl46E',
  qi: 'iYltkV_4PmQDfZfGFpzn2UtYEKyhy-9t3Vy8Mw2VHLAADKGwJvVK5ficQAr2atIF1-agXY2bd6KV-w52zR8rmZfTr0gobzYIyqHczOm13t7uXJv2WygY7QEC2OGjdxa2Fr9RnvS99ozMa5nomZBqTqT7z5QV33czjPRCjvg6FcE',
}
const privateKey = await jose.importJWK(jwk, alg)

const jwt = await new jose.SignJWT({ 'urn:example:claim': true })
  .setProtectedHeader({ alg })
  .setIssuedAt()
  .setIssuer('urn:example:issuer')
  .setAudience('urn:example:audience')
  .setExpirationTime('2h')
  .sign(privateKey)

console.log(jwt)

Constructors

new SignJWT()

▸ new SignJWT(payload): SignJWT

Parameters

Parameter Type Description
payload JWTPayload The JWT Claims Set object. Defaults to an empty object.

Returns

SignJWT

Methods

setAudience()

▸ setAudience(audience): this

Set the "aud" (Audience) Claim.

Parameters

Parameter Type Description
audience string | string[] "aud" (Audience) Claim value to set on the JWT Claims Set.

Returns

this

setExpirationTime()

▸ setExpirationTime(input): this

Set the "exp" (Expiration Time) Claim.

  • If a number is passed as an argument it is used as the claim directly.
  • If a Date instance is passed as an argument it is converted to unix timestamp and used as the claim.
  • If a string is passed as an argument it is resolved to a time span, and then added to the current unix timestamp and used as the claim.

Format used for time span should be a number followed by a unit, such as "5 minutes" or "1 day".

Valid units are: "sec", "secs", "second", "seconds", "s", "minute", "minutes", "min", "mins", "m", "hour", "hours", "hr", "hrs", "h", "day", "days", "d", "week", "weeks", "w", "year", "years", "yr", "yrs", and "y". It is not possible to specify months. 365.25 days is used as an alias for a year.

If the string is suffixed with "ago", or prefixed with a "-", the resulting time span gets subtracted from the current unix timestamp. A "from now" suffix can also be used for readability when adding to the current unix timestamp.

Parameters

Parameter Type Description
input string | number | Date "exp" (Expiration Time) Claim value to set on the JWT Claims Set.

Returns

this

setIssuedAt()

▸ setIssuedAt(input?): this

Set the "iat" (Issued At) Claim.

  • If no argument is used the current unix timestamp is used as the claim.
  • If a number is passed as an argument it is used as the claim directly.
  • If a Date instance is passed as an argument it is converted to unix timestamp and used as the claim.
  • If a string is passed as an argument it is resolved to a time span, and then added to the current unix timestamp and used as the claim.

Format used for time span should be a number followed by a unit, such as "5 minutes" or "1 day".

Valid units are: "sec", "secs", "second", "seconds", "s", "minute", "minutes", "min", "mins", "m", "hour", "hours", "hr", "hrs", "h", "day", "days", "d", "week", "weeks", "w", "year", "years", "yr", "yrs", and "y". It is not possible to specify months. 365.25 days is used as an alias for a year.

If the string is suffixed with "ago", or prefixed with a "-", the resulting time span gets subtracted from the current unix timestamp. A "from now" suffix can also be used for readability when adding to the current unix timestamp.

Parameters

Parameter Type Description
input? string | number | Date "iat" (Expiration Time) Claim value to set on the JWT Claims Set.

Returns

this

setIssuer()

▸ setIssuer(issuer): this

Set the "iss" (Issuer) Claim.

Parameters

Parameter Type Description
issuer string "Issuer" Claim value to set on the JWT Claims Set.

Returns

this

setJti()

▸ setJti(jwtId): this

Set the "jti" (JWT ID) Claim.

Parameters

Parameter Type Description
jwtId string "jti" (JWT ID) Claim value to set on the JWT Claims Set.

Returns

this

setNotBefore()

▸ setNotBefore(input): this

Set the "nbf" (Not Before) Claim.

  • If a number is passed as an argument it is used as the claim directly.
  • If a Date instance is passed as an argument it is converted to unix timestamp and used as the claim.
  • If a string is passed as an argument it is resolved to a time span, and then added to the current unix timestamp and used as the claim.

Format used for time span should be a number followed by a unit, such as "5 minutes" or "1 day".

Valid units are: "sec", "secs", "second", "seconds", "s", "minute", "minutes", "min", "mins", "m", "hour", "hours", "hr", "hrs", "h", "day", "days", "d", "week", "weeks", "w", "year", "years", "yr", "yrs", and "y". It is not possible to specify months. 365.25 days is used as an alias for a year.

If the string is suffixed with "ago", or prefixed with a "-", the resulting time span gets subtracted from the current unix timestamp. A "from now" suffix can also be used for readability when adding to the current unix timestamp.

Parameters

Parameter Type Description
input string | number | Date "nbf" (Not Before) Claim value to set on the JWT Claims Set.

Returns

this

setProtectedHeader()

▸ setProtectedHeader(protectedHeader): this

Sets the JWS Protected Header on the SignJWT object.

Parameters

Parameter Type Description
protectedHeader JWTHeaderParameters JWS Protected Header. Must contain an "alg" (JWS Algorithm) property.

Returns

this

setSubject()

▸ setSubject(subject): this

Set the "sub" (Subject) Claim.

Parameters

Parameter Type Description
subject string "sub" (Subject) Claim value to set on the JWT Claims Set.

Returns

this

sign()

▸ sign(key, options?): Promise<string>

Signs and returns the JWT.

Parameters

Parameter Type Description
key Uint8Array | KeyLike | JWK Private Key or Secret to sign the JWT with. See Algorithm Key Requirements.
options? SignOptions JWT Sign options.

Returns

Promise<string>