diff --git a/package.json b/package.json
index 551044b2..6c8aa1c3 100644
--- a/package.json
+++ b/package.json
@@ -48,6 +48,7 @@
     "fuse.js": "^6.6.2",
     "highlight.js": "^11.6.0",
     "json5": "^2.2.1",
+    "jwt-decode": "^3.1.2",
     "lodash": "^4.17.21",
     "mathjs": "^10.6.4",
     "mime-types": "^2.1.35",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index b7f2a228..5398bd43 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -42,6 +42,7 @@ specifiers:
   highlight.js: ^11.6.0
   jsdom: ^19.0.0
   json5: ^2.2.1
+  jwt-decode: ^3.1.2
   less: ^4.1.3
   lodash: ^4.17.21
   mathjs: ^10.6.4
@@ -85,6 +86,7 @@ dependencies:
   fuse.js: 6.6.2
   highlight.js: 11.6.0
   json5: 2.2.1
+  jwt-decode: 3.1.2
   lodash: 4.17.21
   mathjs: 10.6.4
   mime-types: 2.1.35
@@ -4838,6 +4840,10 @@ packages:
       promise: 7.3.1
     dev: true
 
+  /jwt-decode/3.1.2:
+    resolution: {integrity: sha512-UfpWE/VZn0iP50d8cz9NrZLM9lSWhcJ+0Gt/nm4by88UL+J1SiKN8/5dkjMmbEzwL2CAe+67GsegCbIKtbp75A==}
+    dev: false
+
   /kind-of/6.0.3:
     resolution: {integrity: sha512-dcS1ul+9tmeD95T+x28/ehLgd9mENa3LsvDTtzm3vyBEO7RPptvAD+t44WVXaUjTBRcrpFeFlC8WCruUR456hw==}
     engines: {node: '>=0.10.0'}
diff --git a/src/plugins/naive.plugin.ts b/src/plugins/naive.plugin.ts
index 2a9ac821..077abf97 100644
--- a/src/plugins/naive.plugin.ts
+++ b/src/plugins/naive.plugin.ts
@@ -53,6 +53,7 @@ import {
   NTooltip,
   NUpload,
   NUploadDragger,
+  NPopover,
   NCheckbox,
 } from 'naive-ui';
 
@@ -111,6 +112,7 @@ const components = [
   NIcon,
   NSwitch,
   NCollapseTransition,
+  NPopover,
 ];
 
 export const naive = create({ components });
diff --git a/src/tools/index.ts b/src/tools/index.ts
index 3b94cb4c..69b81e3b 100644
--- a/src/tools/index.ts
+++ b/src/tools/index.ts
@@ -1,3 +1,4 @@
+import { tool as jwtParser } from './jwt-parser';
 import { tool as chmodCalculator } from './chmod-calculator';
 import { tool as mimeTypes } from './mime-types';
 import { tool as otpCodeGeneratorAndValidator } from './otp-code-generator-and-validator';
@@ -63,6 +64,7 @@ export const toolsByCategory: ToolCategory[] = [
       metaTagGenerator,
       otpCodeGeneratorAndValidator,
       mimeTypes,
+      jwtParser,
     ],
   },
   {
diff --git a/src/tools/jwt-parser/claim.vue b/src/tools/jwt-parser/claim.vue
new file mode 100644
index 00000000..3f298a2b
--- /dev/null
+++ b/src/tools/jwt-parser/claim.vue
@@ -0,0 +1,29 @@
+<template>
+  <n-space>
+    <em>{{ claim }}</em>
+    <span v-if="label.label !== claim">
+      <n-popover placement="right" trigger="hover">
+        <template #trigger>
+          <n-icon :component="InfoCircle" trigger />
+        </template>
+        {{ label.label }}
+        <template v-if="label.ref !== ''" #footer> {{ label.ref }} </template>
+      </n-popover>
+    </span>
+  </n-space>
+</template>
+
+<script setup lang="ts">
+import { computed } from 'vue';
+import { InfoCircle } from '@vicons/tabler';
+import { getClaimLabel } from './jwt-parser.service';
+
+const props = defineProps({
+  claim: {
+    type: String,
+    default: '',
+  },
+});
+
+const label = computed(() => getClaimLabel(props.claim ? props.claim : ''));
+</script>
diff --git a/src/tools/jwt-parser/index.ts b/src/tools/jwt-parser/index.ts
new file mode 100644
index 00000000..dcce4f1f
--- /dev/null
+++ b/src/tools/jwt-parser/index.ts
@@ -0,0 +1,11 @@
+import { Key } from '@vicons/tabler';
+import { defineTool } from '../tool';
+
+export const tool = defineTool({
+  name: 'JWT parser',
+  path: '/jwt-parser',
+  description: 'Parse a JWT (JSON Web Token) to display its content.',
+  keywords: ['jwt', 'parser'],
+  component: () => import('./jwt-parser.vue'),
+  icon: Key,
+});
diff --git a/src/tools/jwt-parser/jwt-parser.service.ts b/src/tools/jwt-parser/jwt-parser.service.ts
new file mode 100644
index 00000000..37b6eccf
--- /dev/null
+++ b/src/tools/jwt-parser/jwt-parser.service.ts
@@ -0,0 +1,429 @@
+import jwt_decode, { InvalidTokenError } from 'jwt-decode';
+
+interface JWT {
+  header: Map<string, unknown>;
+  payload: Map<string, unknown>;
+}
+
+export function safeJwtDecode(rawJwt: string): JWT {
+  try {
+    const header = jwt_decode(rawJwt, { header: true }) as Map<string, unknown>;
+    const payload = jwt_decode(rawJwt) as Map<string, unknown>;
+    return { header, payload };
+  } catch (e) {
+    if (e instanceof InvalidTokenError) {
+      return { header: new Map<string, unknown>(), payload: new Map<string, unknown>() };
+    } else {
+      throw e;
+    }
+  }
+}
+
+export function getClaimLabel(claim: string): { label: string; ref: string } {
+  const infos = STANDARD_CLAIMS.find((info) => info.name === claim);
+  if (infos) {
+    return { label: infos.long_name, ref: infos.ref };
+  }
+  switch (claim) {
+    case 'typ':
+      return { label: 'Type', ref: '' };
+    case 'alg':
+      return { label: 'Algorithm', ref: '' };
+  }
+  return { label: claim, ref: '' };
+}
+
+export function parseClaimValue(claim: string, value: unknown): { value: unknown; extension?: unknown } {
+  switch (claim) {
+    case 'exp':
+    case 'nbf':
+    case 'iat': {
+      // Convert to milliseconds, JWT specs says it should be in seconds, JS
+      // works with milliseconds
+      value = typeof value === 'string' ? parseInt(value) : value;
+      const date = new Date((value as number) * 1000);
+      return { value: `${date.toLocaleDateString()} ${date.toLocaleTimeString()}`, extension: value };
+    }
+    case 'alg':
+      return { value: AlgorithmKeyDescriptionMapping[value as string], extension: value };
+    default:
+      if (typeof value === 'boolean') {
+        // Perhaps there's a better way to do this?
+        return { value: value ? 'true' : 'false' };
+      }
+      return { value: value };
+  }
+}
+
+// From https://datatracker.ietf.org/doc/html/rfc7518#section-3.1
+const AlgorithmKeyDescriptionMapping: { [k: string]: string } = {
+  HS256: 'HMAC using SHA-256',
+  HS384: 'HMAC using SHA-384',
+  HS512: 'HMAC using SHA-512',
+  RS256: 'RSASSA-PKCS1-v1_5 using SHA-256',
+  RS384: 'RSASSA-PKCS1-v1_5 using SHA-384',
+  RS512: 'RSASSA-PKCS1-v1_5 using SHA-512',
+  ES256: 'ECDSA using P-256 and SHA-256',
+  ES384: 'ECDSA using P-384 and SHA-384',
+  ES512: 'ECDSA using P-521 and SHA-512',
+  PS256: 'RSASSA-PSS using SHA-256 and MGF1 with SHA-256',
+  PS384: 'RSASSA-PSS using SHA-384 and MGF1 with SHA-384',
+  PS512: 'RSASSA-PSS using SHA-512 and MGF1 with SHA-512',
+  none: 'No digital signature or MAC performed',
+};
+
+// List extracted from IANA: https://www.iana.org/assignments/jwt/jwt.xhtml
+const STANDARD_CLAIMS = [
+  {
+    name: 'iss',
+    long_name: 'Issuer',
+    ref: '[RFC7519 - Section 4.1.1]',
+  },
+  {
+    name: 'sub',
+    long_name: 'Subject',
+    ref: '[RFC7519 - Section 4.1.2]',
+  },
+  {
+    name: 'aud',
+    long_name: 'Audience',
+    ref: '[RFC7519 - Section 4.1.3]',
+  },
+  {
+    name: 'exp',
+    long_name: 'Expiration Time',
+    ref: '[RFC7519 - Section 4.1.4]',
+  },
+  {
+    name: 'nbf',
+    long_name: 'Not Before',
+    ref: '[RFC7519 - Section 4.1.5]',
+  },
+  {
+    name: 'iat',
+    long_name: 'Issued At',
+    ref: '[RFC7519 - Section 4.1.6]',
+  },
+  {
+    name: 'jti',
+    long_name: 'JWT ID',
+    ref: '[RFC7519 - Section 4.1.7]',
+  },
+  {
+    name: 'name',
+    long_name: 'Full name',
+    ref: '[OpenID Connect Core 1.0 - Section 5.1]',
+  },
+  {
+    name: 'given_name',
+    long_name: 'Given name(s) or first name(s)',
+    ref: '[OpenID Connect Core 1.0 - Section 5.1]',
+  },
+  {
+    name: 'family_name',
+    long_name: 'Surname(s) or last name(s)',
+    ref: '[OpenID Connect Core 1.0 - Section 5.1]',
+  },
+  {
+    name: 'middle_name',
+    long_name: 'Middle name(s)',
+    ref: '[OpenID Connect Core 1.0 - Section 5.1]',
+  },
+  {
+    name: 'nickname',
+    long_name: 'Casual name',
+    ref: '[OpenID Connect Core 1.0 - Section 5.1]',
+  },
+  {
+    name: 'preferred_username',
+    long_name: 'Shorthand name by which the End-User wishes to be referred to',
+    ref: '[OpenID Connect Core 1.0 - Section 5.1]',
+  },
+  {
+    name: 'profile',
+    long_name: 'Profile page URL',
+    ref: '[OpenID Connect Core 1.0 - Section 5.1]',
+  },
+  {
+    name: 'picture',
+    long_name: 'Profile picture URL',
+    ref: '[OpenID Connect Core 1.0 - Section 5.1]',
+  },
+  {
+    name: 'website',
+    long_name: 'Web page or blog URL',
+    ref: '[OpenID Connect Core 1.0 - Section 5.1]',
+  },
+  {
+    name: 'email',
+    long_name: 'Preferred e-mail address',
+    ref: '[OpenID Connect Core 1.0 - Section 5.1]',
+  },
+  {
+    name: 'email_verified',
+    long_name: 'True if the e-mail address has been verified; otherwise false',
+    ref: '[OpenID Connect Core 1.0 - Section 5.1]',
+  },
+  {
+    name: 'gender',
+    long_name: 'Gender',
+    ref: '[OpenID Connect Core 1.0 - Section 5.1]',
+  },
+  {
+    name: 'birthdate',
+    long_name: 'Birthday',
+    ref: '[OpenID Connect Core 1.0 - Section 5.1]',
+  },
+  {
+    name: 'zoneinfo',
+    long_name: 'Time zone',
+    ref: '[OpenID Connect Core 1.0 - Section 5.1]',
+  },
+  {
+    name: 'locale',
+    long_name: 'Locale',
+    ref: '[OpenID Connect Core 1.0 - Section 5.1]',
+  },
+  {
+    name: 'phone_number',
+    long_name: 'Preferred telephone number',
+    ref: '[OpenID Connect Core 1.0 - Section 5.1]',
+  },
+  {
+    name: 'phone_number_verified',
+    long_name: 'True if the phone number has been verified; otherwise false',
+    ref: '[OpenID Connect Core 1.0 - Section 5.1]',
+  },
+  {
+    name: 'address',
+    long_name: 'Preferred postal address',
+    ref: '[OpenID Connect Core 1.0 - Section 5.1]',
+  },
+  {
+    name: 'updated_at',
+    long_name: 'Time the information was last updated',
+    ref: '[OpenID Connect Core 1.0 - Section 5.1]',
+  },
+  {
+    name: 'azp',
+    long_name: 'Authorized party - the party to which the ID Token was issued',
+    ref: '[OpenID Connect Core 1.0 - Section 2]',
+  },
+  {
+    name: 'nonce',
+    long_name: 'Value used to associate a Client session with an ID Token',
+    ref: '[OpenID Connect Core 1.0 - Section 2]',
+  },
+  {
+    name: 'auth_time',
+    long_name: 'Time when the authentication occurred',
+    ref: '[OpenID Connect Core 1.0 - Section 2]',
+  },
+  {
+    name: 'at_hash',
+    long_name: 'Access Token hash value',
+    ref: '[OpenID Connect Core 1.0 - Section 2]',
+  },
+  {
+    name: 'c_hash',
+    long_name: 'Code hash value',
+    ref: '[OpenID Connect Core 1.0 - Section 3.3.2.11]',
+  },
+  {
+    name: 'acr',
+    long_name: 'Authentication Context Class Reference',
+    ref: '[OpenID Connect Core 1.0 - Section 2]',
+  },
+  {
+    name: 'amr',
+    long_name: 'Authentication Methods References',
+    ref: '[OpenID Connect Core 1.0 - Section 2]',
+  },
+  {
+    name: 'sub_jwk',
+    long_name: 'Public key used to check the signature of an ID Token',
+    ref: '[OpenID Connect Core 1.0 - Section 7.4]',
+  },
+  {
+    name: 'cnf',
+    long_name: 'Confirmation',
+    ref: '[RFC7800 - Section 3.1]',
+  },
+  {
+    name: 'sip_from_tag',
+    long_name: 'SIP From tag header field parameter value',
+    ref: '[RFC8055][RFC3261]',
+  },
+  {
+    name: 'sip_date',
+    long_name: 'SIP Date header field value',
+    ref: '[RFC8055][RFC3261]',
+  },
+  {
+    name: 'sip_callid',
+    long_name: 'SIP Call-Id header field value',
+    ref: '[RFC8055][RFC3261]',
+  },
+  {
+    name: 'sip_cseq_num',
+    long_name: 'SIP CSeq numeric header field parameter value',
+    ref: '[RFC8055][RFC3261]',
+  },
+  {
+    name: 'sip_via_branch',
+    long_name: 'SIP Via branch header field parameter value',
+    ref: '[RFC8055][RFC3261]',
+  },
+  {
+    name: 'orig',
+    long_name: 'Originating Identity String',
+    ref: '[RFC8225 - Section 5.2.1]',
+  },
+  {
+    name: 'dest',
+    long_name: 'Destination Identity String',
+    ref: '[RFC8225 - Section 5.2.1]',
+  },
+  {
+    name: 'mky',
+    long_name: 'Media Key Fingerprint String',
+    ref: '[RFC8225 - Section 5.2.2]',
+  },
+  {
+    name: 'events',
+    long_name: 'Security Events',
+    ref: '[RFC8417 - Section 2.2]',
+  },
+  {
+    name: 'toe',
+    long_name: 'Time of Event',
+    ref: '[RFC8417 - Section 2.2]',
+  },
+  {
+    name: 'txn',
+    long_name: 'Transaction Identifier',
+    ref: '[RFC8417 - Section 2.2]',
+  },
+  {
+    name: 'rph',
+    long_name: 'Resource Priority Header Authorization',
+    ref: '[RFC8443 - Section 3]',
+  },
+  {
+    name: 'sid',
+    long_name: 'Session ID',
+    ref: '[OpenID Connect Front-Channel Logout 1.0 - Section 3]',
+  },
+  {
+    name: 'vot',
+    long_name: 'Vector of Trust value',
+    ref: '[RFC8485]',
+  },
+  {
+    name: 'vtm',
+    long_name: 'Vector of Trust trustmark URL',
+    ref: '[RFC8485]',
+  },
+  {
+    name: 'attest',
+    long_name: 'Attestation level as defined in SHAKEN framework',
+    ref: '[RFC8588]',
+  },
+  {
+    name: 'origid',
+    long_name: 'Originating Identifier as defined in SHAKEN framework',
+    ref: '[RFC8588]',
+  },
+  {
+    name: 'act',
+    long_name: 'Actor',
+    ref: '[RFC8693 - Section 4.1]',
+  },
+  {
+    name: 'scope',
+    long_name: 'Scope Values',
+    ref: '[RFC8693 - Section 4.2]',
+  },
+  {
+    name: 'client_id',
+    long_name: 'Client Identifier',
+    ref: '[RFC8693 - Section 4.3]',
+  },
+  {
+    name: 'may_act',
+    long_name: 'Authorized Actor - the party that is authorized to become the actor',
+    ref: '[RFC8693 - Section 4.4]',
+  },
+  {
+    name: 'jcard',
+    long_name: 'jCard data',
+    ref: '[RFC8688][RFC7095]',
+  },
+  {
+    name: 'at_use_nbr',
+    long_name: 'Number of API requests for which the access token can be used',
+    ref: '[ETSI GS NFV-SEC 022 V2.7.1]',
+  },
+  {
+    name: 'div',
+    long_name: 'Diverted Target of a Call',
+    ref: '[RFC8946]',
+  },
+  {
+    name: 'opt',
+    long_name: 'Original PASSporT (in Full Form)',
+    ref: '[RFC8946]',
+  },
+  {
+    name: 'vc',
+    long_name: 'Verifiable Credential as specified in the W3C Recommendation',
+    ref: '[W3C Recommendation Verifiable Credentials Data Model 1.0 - Expressing verifiable information on the Web (19 November 2019) - Section 6.3.1]',
+  },
+  {
+    name: 'vp',
+    long_name: 'Verifiable Presentation as specified in the W3C Recommendation',
+    ref: '[W3C Recommendation Verifiable Credentials Data Model 1.0 - Expressing verifiable information on the Web (19 November 2019) - Section 6.3.1]',
+  },
+  {
+    name: 'sph',
+    long_name: 'SIP Priority header field',
+    ref: '[RFC9027]',
+  },
+  {
+    name: 'ace_profile',
+    long_name: 'The ACE profile a token is supposed to be used with.',
+    ref: '[RFC-ietf-ace-oauth-authz-46 - Section 5.10]',
+  },
+  {
+    name: 'cnonce',
+    long_name:
+      'client-nonce. A nonce previously provided to the AS by the RS via the client. Used to verify token freshness when the RS cannot synchronize its clock with the AS.',
+    ref: '[RFC-ietf-ace-oauth-authz-46 - Section 5.10]',
+  },
+  {
+    name: 'exi',
+    long_name:
+      'Expires in. Lifetime of the token in seconds from the time the RS first sees it. Used to implement a weaker from of token expiration for devices that cannot synchronize their internal clocks.',
+    ref: '[RFC-ietf-ace-oauth-authz-46 - Section 5.10.3]',
+  },
+  {
+    name: 'roles',
+    long_name: 'Roles',
+    ref: '[RFC7643 - Section 4.1.2][RFC9068 - Section 2.2.3.1]',
+  },
+  {
+    name: 'groups',
+    long_name: 'Groups',
+    ref: '[RFC7643 - Section 4.1.2][RFC9068 - Section 2.2.3.1]',
+  },
+  {
+    name: 'entitlements',
+    long_name: 'Entitlements',
+    ref: '[RFC7643 - Section 4.1.2][RFC9068 - Section 2.2.3.1]',
+  },
+  {
+    name: 'token_introspection',
+    long_name: 'Token introspection response',
+    ref: '[RFC-ietf-oauth-jwt-introspection-response-12 - Section 5]',
+  },
+];
diff --git a/src/tools/jwt-parser/jwt-parser.vue b/src/tools/jwt-parser/jwt-parser.vue
new file mode 100644
index 00000000..e0b53896
--- /dev/null
+++ b/src/tools/jwt-parser/jwt-parser.vue
@@ -0,0 +1,63 @@
+<template>
+  <n-card>
+    <n-form-item label="JWT to decode" :feedback="validation.message" :validation-status="validation.status">
+      <n-input v-model:value="rawJwt" type="textarea" placeholder="Put your token here..." rows="5" />
+    </n-form-item>
+
+    <n-table>
+      <tbody>
+        <td colspan="2" class="table-header"><strong>Header</strong></td>
+        <tr v-for="[key, value] in Object.entries(decodedJWT.header)" :key="key">
+          <td class="claims"><claim-vue :claim="key" /></td>
+          <td>
+            <value-vue :claim="key" :value="value" />
+          </td>
+        </tr>
+        <td colspan="2" class="table-header"><strong>Payload</strong></td>
+        <tr v-for="[key, value] in Object.entries(decodedJWT.payload)" :key="key">
+          <td class="claims"><claim-vue :claim="key" /></td>
+          <td>
+            <value-vue :claim="key" :value="value" />
+          </td>
+        </tr>
+      </tbody>
+    </n-table>
+  </n-card>
+</template>
+
+<script setup lang="ts">
+import { computed, ref } from 'vue';
+import jwt_decode from 'jwt-decode';
+import { useValidation } from '@/composable/validation';
+import { isNotThrowing } from '@/utils/boolean';
+import { safeJwtDecode } from './jwt-parser.service';
+import claimVue from './claim.vue';
+import valueVue from './value.vue';
+
+const rawJwt = ref(
+  'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c',
+);
+
+const decodedJWT = computed(() => {
+  return safeJwtDecode(rawJwt.value);
+});
+const validation = useValidation({
+  source: rawJwt,
+  rules: [
+    {
+      validator: (value) => value.length > 0 && isNotThrowing(() => jwt_decode(value, { header: true })),
+      message: 'Invalid JWT',
+    },
+  ],
+});
+</script>
+
+<style lang="less" scoped>
+.table-header {
+  text-align: center;
+}
+
+.claims {
+  width: 20%;
+}
+</style>
diff --git a/src/tools/jwt-parser/value.vue b/src/tools/jwt-parser/value.vue
new file mode 100644
index 00000000..82c10426
--- /dev/null
+++ b/src/tools/jwt-parser/value.vue
@@ -0,0 +1,24 @@
+<template>
+  <n-space>
+    {{ value.value }}
+    <em v-if="value.extension">({{ value.extension }})</em>
+  </n-space>
+</template>
+
+<script setup lang="ts">
+import { computed } from 'vue';
+import { parseClaimValue } from './jwt-parser.service';
+
+const props = defineProps({
+  claim: {
+    type: String,
+    default: '',
+  },
+  value: {
+    type: String,
+    default: '',
+  },
+});
+
+const value = computed(() => parseClaimValue(props.claim, props.value));
+</script>