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June 20, 2024 13:21
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Decode, reuse, and visualize a JWT in Postman
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var jsonData = pm.response.json(); | |
pm.environment.set("jwt", jsonData.access_token); | |
function parseJwt (token,part) { | |
var base64Url = token.split('.')[part]; | |
var words = CryptoJS.enc.Base64.parse(base64Url); | |
var jsonPayload = CryptoJS.enc.Utf8.stringify(words); | |
return JSON.parse(jsonPayload); | |
}; | |
var jwtInfo ={}; | |
jwtInfo.size = jsonData.access_token.length; | |
jwtInfo.header = parseJwt(jsonData.access_token,0); | |
jwtInfo.payload = parseJwt(jsonData.access_token,1); | |
jwtInfo.signature = jsonData.access_token.split('.')[2]; | |
jwtInfo.expires = ((jwtInfo.payload.exp-Date.now().valueOf()/1000)/60).toFixed(1); | |
console.log(jwtInfo); | |
var template = ` | |
<b>JWT Size:{{response.size}}Bytes. Expires in {{response.expires}} minutes</b><br> | |
<b>Header </b> | |
<table> | |
<tr><th>Property</th><th>Value</th></tr> | |
{{#each response.header}} | |
<tr><td>{{@key}}</td><td>{{.}}</td></tr> | |
{{/each}} | |
</table> | |
<b>Payload</b> | |
<table> | |
<tr><th>Property</th><th>Value</th></tr> | |
{{#each response.payload}} | |
<tr><td>{{@key}}</td><td>{{.}}</td></tr> | |
{{/each}} | |
</table> | |
<b>Claims</b> | |
<table bgcolor="#FFFFFF"> | |
<tr><th>Claim</th><th>Value</th></tr> | |
{{#each response.payload.Claims}} | |
<tr> | |
{{#each this}} | |
<td>{{.}}</td> | |
{{/each}} | |
</tr> | |
{{/each}} | |
</table> | |
<i>signature:{{response.signature}}</i> | |
`; | |
pm.visualizer.set(template, {response: jwtInfo}); |
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