[GH-ISSUE #1894] jwt string in request body gets converted to json payload when scripting is enabled #1887

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opened 2026-03-03 19:55:11 +03:00 by kerem · 3 comments

kerem commented

2026-03-03 19:55:11 +03:00

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Originally created by @pbt4991 on GitHub (Dec 23, 2023).
Original GitHub issue: https://github.com/ProxymanApp/Proxyman/issues/1894

Originally assigned to: @NghiaTranUIT on GitHub.

Description

I'm working with an API that uses custom "Content-Type" header and the request body is a jwt string.
Whenever I enable Scripting, the jwt in the body gets converted to a json payload. My script does not even contain any logic that modifies the request.

async function onRequest(context, url, request) {
  return request;
}

Steps to Reproduce

Enable Scripting
run:

curl -X POST https://www.example.com -H "Content-Type: application/my-custom-type" --data-raw "eyJzdGF0dXMiOiJydW5uaW5nIiwiYWN0aW9ucyI6W3sidHlwZSI6InNldCIsIm91dHB1dCI6Imxpbmtfc291cmNlIiwidmFsdWUiOiJkZWZhdWx0IiwiZG9uZSI6dHJ1ZX1dfQ==" --proxy http://localhost:9090

Current Behavior

Payload is altered:

Expected Behavior

request body should remain as eyJzdGF0dXMiOiJydW5uaW5nIiwiYWN0aW9ucyI6W3sidHlwZSI6InNldCIsIm91dHB1dCI6Imxpbmtfc291cmNlIiwidmFsdWUiOiJkZWZhdWx0IiwiZG9uZSI6dHJ1ZX1dfQ==

Environment

App version: e.g Proxyman 4.15.0
macOS version: macOS Monterey

Originally created by @pbt4991 on GitHub (Dec 23, 2023). Original GitHub issue: https://github.com/ProxymanApp/Proxyman/issues/1894 Originally assigned to: @NghiaTranUIT on GitHub. ## Description I'm working with an API that uses custom "Content-Type" header and the request body is a jwt string. Whenever I enable Scripting, the jwt in the body gets converted to a json payload. My script does not even contain any logic that modifies the request. ``` async function onRequest(context, url, request) { return request; } ``` ## Steps to Reproduce  1. Enable Scripting 2. run: ``` curl -X POST https://www.example.com -H "Content-Type: application/my-custom-type" --data-raw "eyJzdGF0dXMiOiJydW5uaW5nIiwiYWN0aW9ucyI6W3sidHlwZSI6InNldCIsIm91dHB1dCI6Imxpbmtfc291cmNlIiwidmFsdWUiOiJkZWZhdWx0IiwiZG9uZSI6dHJ1ZX1dfQ==" --proxy http://localhost:9090 ``` ## Current Behavior Payload is altered: <img width="752" alt="image" src="https://github.com/ProxymanApp/Proxyman/assets/49348488/0b765f48-0bb1-4584-abb8-71dc63b441cf"> ## Expected Behavior request body should remain as `eyJzdGF0dXMiOiJydW5uaW5nIiwiYWN0aW9ucyI6W3sidHlwZSI6InNldCIsIm91dHB1dCI6Imxpbmtfc291cmNlIiwidmFsdWUiOiJkZWZhdWx0IiwiZG9uZSI6dHJ1ZX1dfQ==` ## Environment - App version: e.g Proxyman 4.15.0 - macOS version: macOS Monterey

kerem added the

bug

✅ Done

labels

2026-03-03 19:55:11 +03:00

kerem commented

2026-03-03 19:55:12 +03:00

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@NghiaTranUIT commented on GitHub (Dec 23, 2023):

Thanks. I will investigate this bug and get back to you asap 👍

@NghiaTranUIT commented on GitHub (Dec 23, 2023): Thanks. I will investigate this bug and get back to you asap 👍

kerem commented

2026-03-03 19:55:12 +03:00

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Owner

@NghiaTranUIT commented on GitHub (Dec 24, 2023):

@theelbowclaps you can try this Beta build: https://download.proxyman.io/beta/Proxyman_4.15.0_Fix_Scripting_with_Body_String.dmg

Fix the Script issue when it tried to parse the string to base64 data (due to unknown Content-Type)

@NghiaTranUIT commented on GitHub (Dec 24, 2023): @theelbowclaps you can try this Beta build: https://download.proxyman.io/beta/Proxyman_4.15.0_Fix_Scripting_with_Body_String.dmg - Fix the Script issue when it tried to parse the string to base64 data (due to unknown Content-Type)

kerem commented

2026-03-03 19:55:12 +03:00

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Owner

@pbt4991 commented on GitHub (Dec 27, 2023):

@theelbowclaps you can try this Beta build: https://download.proxyman.io/beta/Proxyman_4.15.0_Fix_Scripting_with_Body_String.dmg

Fix the Script issue when it tried to parse the string to base64 data (due to unknown Content-Type)

It's working great now. Thanks a bunch!

@pbt4991 commented on GitHub (Dec 27, 2023): > @theelbowclaps you can try this Beta build: https://download.proxyman.io/beta/Proxyman_4.15.0_Fix_Scripting_with_Body_String.dmg > > * Fix the Script issue when it tried to parse the string to base64 data (due to unknown Content-Type) It's working great now. Thanks a bunch!