# Unable to load Large Jason to post man to generate collection **URL:** \ **Category:** Help Hub\ **Tags:** documentation, collections, json\ **Created:** [March 14, 2021, 1:32am UTC](https://community.postman.com/t/unable-to-load-large-jason-to-post-man-to-generate-collection/21343 "2021-03-14T01:32:50Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![karthikdev](https://avatars.discourse-cdn.com/v4/letter/k/b77776/32.png) [@karthikdev](https://community.postman.com/u/karthikdev)\ **Post date:** [March 14, 2021, 1:32am UTC](https://community.postman.com/t/unable-to-load-large-jason-to-post-man-to-generate-collection/21343/1 "2021-03-14T01:32:50Z")
Hello, I am working in [asp.net](http://asp.net) core and my website has swagger documentation. My Api has more than 300 url’s. I am not sure the exact count. i took the swagger.json and tried to all it in postman. What i did, i imported the swagger.json file and it was able to import. but when i try to generate the collection, its doing nothing. The file is about 5.4MB. not sure about the reason. please guide me to solve this issue ---
**Author:** ![bpricilla](https://sea2.discourse-cdn.com/getpostman/user_avatar/community.postman.com/bpricilla/32/6511_2.png) [@bpricilla](https://community.postman.com/u/bpricilla)\ **Post date:** [March 14, 2021, 1:57am UTC](https://community.postman.com/t/unable-to-load-large-jason-to-post-man-to-generate-collection/21343/2 "2021-03-14T01:57:32Z")
Hi @karthikdev. Warm welcome to the community 😊 When you tried you import, any error messages displayed in UI? Can you possibly detail your steps for import with screenshots? If there’s nothing visible when you try to import then you can raise an issue [here](https://github.com/postmanlabs/postman-app-support). The Team will be responding at the earliest 🙂 ---
**Author:** ![karthikdev](https://avatars.discourse-cdn.com/v4/letter/k/b77776/32.png) [@karthikdev](https://community.postman.com/u/karthikdev)\ **Post date:** [March 14, 2021, 2:48am UTC](https://community.postman.com/t/unable-to-load-large-jason-to-post-man-to-generate-collection/21343/3 "2021-03-14T02:48:43Z")
Hi, Thanks for the reply and i found the issue. But not sure about the solution. The issue is, if i remove the definition from the swagger, Postman is able to handle. But if i have the definition, postman unable to handle it. because of the definition, the file size is too large. Please let me know the solution. ---
**Author:** ![diegoaudatex](https://avatars.discourse-cdn.com/v4/letter/d/779978/32.png) [@diegoaudatex](https://community.postman.com/u/diegoaudatex)\ **Post date:** [October 13, 2021, 7:04pm UTC](https://community.postman.com/t/unable-to-load-large-jason-to-post-man-to-generate-collection/21343/4 "2021-10-13T19:04:02Z")
Hello everyone, I am having the same issue, with similar technologies. using .net core and swagger to get the specification. The file has more than 300 endpoints. This is the set up that I am using. ![image](https://us1.discourse-cdn.com/getpostman/original/2X/1/1307b595952f2c9e86712b6b61b372201f9d4cc5.png) And after some time I get this result. ![image](https://us1.discourse-cdn.com/getpostman/original/2X/4/4e9b7d2c17959e379af233fe57b57c4cd7cf8125.png) This is the output in the console. ![image](https://us1.discourse-cdn.com/getpostman/original/2X/8/8088512ad0fd0bef4b84202c13d6b4d42d9de08f.png) ---
**Author:** ![diegoaudatex](https://avatars.discourse-cdn.com/v4/letter/d/779978/32.png) [@diegoaudatex](https://community.postman.com/u/diegoaudatex)\ **Post date:** [October 13, 2021, 7:05pm UTC](https://community.postman.com/t/unable-to-load-large-jason-to-post-man-to-generate-collection/21343/5 "2021-10-13T19:05:18Z")
I don’t know if this issue was solved but if you could help me @bpricilla would be wonderful 😃 ---
**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:** [October 11, 2025, 7:15am UTC](https://community.postman.com/t/unable-to-load-large-jason-to-post-man-to-generate-collection/21343/6 "2025-10-11T07:15:21Z")