# How to prevent serialization of data when using the runner? **URL:** \ **Category:** Help Hub\ **Tags:** runner, collection-runner\ **Created:** [August 12, 2024, 2:20pm UTC](https://community.postman.com/t/how-to-prevent-serialization-of-data-when-using-the-runner/65988 "2024-08-12T14:20:41Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![automatix](https://avatars.discourse-cdn.com/v4/letter/a/f08c70/32.png) [@automatix](https://community.postman.com/u/automatix)\ **Post date:** [August 12, 2024, 2:20pm UTC](https://community.postman.com/t/how-to-prevent-serialization-of-data-when-using-the-runner/65988/1 "2024-08-12T14:20:41Z")
Hi there! I want to loop over a JSON array of objects and use each object directly as body, and send it as it is. I upload my JSON fil to the runner and add the request to execute. The runner identifies the number of iterateion correctly. I set my request’s body to `raw` and `JSON` and clear it. Then a add this pre-script: ```auto let currentData = pm.iterationData.toJSON(); console.log("Sending request body:", JSON.stringify(currentData)); pm.request.body.raw = JSON.stringify(currentData); ``` But when I start a run, instead of sending my data, Postman send its serialized version. How to prevent this behaviour and send just the data from the JSON file? My data: ```auto [ { "title": "Project A Title", "role": "Project A Role", "from": "1970-01", "to": "1970-12", "tasks": "Project A Tasks", "tools": null, "skills": [ "Java", "Python", "PHP" ], "customerName": "Project A Customer", "displayCustomerName": true, "location": null, "businessDepartment": null, "businessBranch": null, "contractType": null, "contractHoursPercentage": null, "hourlyRate": { "paymentRate": null, "paymentCurrency": "EUR" }, "selectedDirektProject": null } ] ``` What Postman sends: ```auto {"id":"33252f12-80ca-4ab1-a5b8-209de4cc501c","values":[{"type":"any","value":"Project A Title","key":"title"},{"type":"any","value":"Project A Role","key":"role"},{"type":"any","value":"1970-01","key":"from"},{"type":"any","value":"1970-12","key":"to"},{"type":"any","value":"Project A Tasks","key":"tasks"},{"type":"any","value":null,"key":"tools"},{"type":"any","value":["Java","Python","PHP"],"key":"skills"},{"type":"any","value":"Project A Customer","key":"customerName"},{"type":"any","value":true,"key":"displayCustomerName"},{"type":"any","value":null,"key":"location"},{"type":"any","value":null,"key":"businessDepartment"},{"type":"any","value":null,"key":"businessBranch"},{"type":"any","value":null,"key":"contractType"},{"type":"any","value":null,"key":"contractHoursPercentage"},{"type":"any","value":{"paymentRate":null,"paymentCurrency":"EUR"},"key":"hourlyRate"},{"type":"any","value":null,"key":"selectedDirektProject"}]} ``` ---
**Author:** ![danny-dainton](https://sea2.discourse-cdn.com/getpostman/user_avatar/community.postman.com/danny-dainton/32/29401_2.png) [@danny-dainton](https://community.postman.com/u/danny-dainton)\ **Post date:** [August 12, 2024, 2:43pm UTC](https://community.postman.com/t/how-to-prevent-serialization-of-data-when-using-the-runner/65988/2 "2024-08-12T14:43:58Z")
Hey @automatix 👋 Welcome to the Postman Community! :postman: If you have your JSON file structured like this, using the `body` as the key: ```auto [ { "body": { "title": "Project A Title", "role": "Project A Role", "from": "1970-01", "to": "1970-12", "tasks": "Project A Tasks", "tools": null, "skills": [ "Java", "Python", "PHP" ], "customerName": "Project A Customer", "displayCustomerName": true, "location": null, "businessDepartment": null, "businessBranch": null, "contractType": null, "contractHoursPercentage": null, "hourlyRate": { "paymentRate": null, "paymentCurrency": "EUR" }, "selectedDirektProject": null } }, { "body": { "title": "Project B Title", "role": "Project B Role", "from": "1970-01", "to": "1970-12", "tasks": "Project B Tasks", "tools": null, "skills": [ "Java", "Python", "PHP" ], "customerName": "Project B Customer", "displayCustomerName": true, "location": null, "businessDepartment": null, "businessBranch": null, "contractType": null, "contractHoursPercentage": null, "hourlyRate": { "paymentRate": null, "paymentCurrency": "EUR" }, "selectedDirektProject": null } } ] ``` You could add something basic to the pre-request script that sets the value of `payload` at runtime and takes the `body` variable from the JSON datafile: ![Screenshot 2024-08-12 at 15.32.13](https://us1.discourse-cdn.com/getpostman/original/3X/2/d/2d6b6c21ce913dec1531f38d3ed37b72f71067de.png) When the request body contains `{{payload}}` it will use the current iteration data as the request body. ![image](https://us1.discourse-cdn.com/getpostman/original/3X/a/5/a53f0d9614d35caeab5dcb05a2db595089b9fc19.jpeg) Is that what you’re trying to do? ---
**Author:** ![michaelderekjones](https://sea2.discourse-cdn.com/getpostman/user_avatar/community.postman.com/michaelderekjones/32/14819_2.png) [@michaelderekjones](https://community.postman.com/u/michaelderekjones)\ **Post date:** [August 12, 2024, 4:17pm UTC](https://community.postman.com/t/how-to-prevent-serialization-of-data-when-using-the-runner/65988/4 "2024-08-12T16:17:04Z")
> [@automatix](#): > > `let currentData = pm.iterationData.toJSON();` I think you just need to change that to toObject(). ```auto let currentData = pm.iterationData.toObject(); console.log("Sending request body:", JSON.stringify(currentData)); pm.request.body.raw = JSON.stringify(currentData); ``` ---
**Author:** ![automatix](https://avatars.discourse-cdn.com/v4/letter/a/f08c70/32.png) [@automatix](https://community.postman.com/u/automatix)\ **Post date:** [August 14, 2024, 12:41pm UTC](https://community.postman.com/t/how-to-prevent-serialization-of-data-when-using-the-runner/65988/5 "2024-08-14T12:41:47Z")
Thank you! Just tried this out. The console log looks good. But Postman sends the request with a empty body. that mean `pm.request.body.raw` doesn’t get replaced. ---
**Author:** ![michaelderekjones](https://sea2.discourse-cdn.com/getpostman/user_avatar/community.postman.com/michaelderekjones/32/14819_2.png) [@michaelderekjones](https://community.postman.com/u/michaelderekjones)\ **Post date:** [August 14, 2024, 1:02pm UTC](https://community.postman.com/t/how-to-prevent-serialization-of-data-when-using-the-runner/65988/6 "2024-08-14T13:02:09Z")
I tested this using Postman Echo. ![image](https://us1.discourse-cdn.com/getpostman/original/3X/b/8/b8d6cee17ed7112fdfc0fbf21d368fb49c80c49e.png) With this JSON as the data file. ```auto [ { "title": "Project A Title", "role": "Project A Role", "from": "1970-01", "to": "1970-12", "tasks": "Project A Tasks", "tools": null, "skills": [ "Java", "Python", "PHP" ], "customerName": "Project A Customer", "displayCustomerName": true, "location": null, "businessDepartment": null, "businessBranch": null, "contractType": null, "contractHoursPercentage": null, "hourlyRate": { "paymentRate": null, "paymentCurrency": "EUR" }, "selectedDirektProject": null } ] ``` The console logs shows the body the request was sent with. ![image](https://us1.discourse-cdn.com/getpostman/original/3X/3/0/301707d52107639320e21050630fd4d93c6b6372.png) It is also echoed back from the Postman Echo API. Your request gets echoed back with the data element. ![image](https://us1.discourse-cdn.com/getpostman/original/3X/9/5/952ea880ed54b53c5c728801de39b40c203f9b58.png) Can you confirm that your body is set to raw\JSON? ![image](https://us1.discourse-cdn.com/getpostman/original/3X/e/5/e5dc1e232a8f7e4a310a84e9787d9a30409d2fad.png) ---
**Author:** ![system](https://sea2.discourse-cdn.com/getpostman/user_avatar/community.postman.com/system/32/29796_2.png) [@system](https://community.postman.com/u/system)\ **Post date:** [September 13, 2024, 1:02pm UTC](https://community.postman.com/t/how-to-prevent-serialization-of-data-when-using-the-runner/65988/7 "2024-09-13T13:02:28Z")
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