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JSON Server vs Swagger UI: What are the differences?
Developers describe JSON Server as "Get a full fake REST API with zero coding in less than 30 seconds. For front-end developers who need a quick back-end for prototyping and mocking". Created with <3 for front-end developers who need a quick back-end for prototyping and mocking. On the other hand, Swagger UI is detailed as "dependency-free collection of HTML, Javascript, and CSS assets that dynamically generate beautiful documentation". Swagger UI is a dependency-free collection of HTML, Javascript, and CSS assets that dynamically generate beautiful documentation and sandbox from a Swagger-compliant API.
JSON Server belongs to "API Tools" category of the tech stack, while Swagger UI can be primarily classified under "Documentation as a Service & Tools".
"Stupid simple" is the top reason why over 2 developers like JSON Server, while over 33 developers mention "Open Source" as the leading cause for choosing Swagger UI.
JSON Server is an open source tool with 40.8K GitHub stars and 3.64K GitHub forks. Here's a link to JSON Server's open source repository on GitHub.
From a StackShare Community member: "I just started working for a start-up and we are in desperate need of better documentation for our API. Currently our API docs is in a README.md file. We are evaluating Postman and Swagger UI. Since there are many options and I was wondering what other StackSharers would recommend?"
I use Postman because of the ease of team-management, using workspaces and teams, runner, collections, environment variables, test-scripts (post execution), variable management (pre and post execution), folders (inside collections, for better management of APIs), newman, easy-ci-integration (and probably a few more things that I am not able to recall right now).
I use Swagger UI because it's an easy tool for end-consumers to visualize and test our APIs. It focuses on that ! And it's directly embedded and delivered with the APIs. Postman's built-in tools aren't bad, but their main focus isn't the documentation and also, they are hosted outside the project.

I recommend Postman because it's easy to use with history option. Also, it has very great features like runner, collections, test scripts runners, defining environment variables and simple exporting and importing data.
Pros of JSON Server
- Stupid simple7
Pros of Swagger UI
- Open Source47
- Can execute api calls from the documentation34
- Free to use29
- Customizable19
- Easy to implement in .Net14
- Mature, clean spec13
- API Visualization11
- Coverage9
- Scaffolding6
- Easy to use6
- Vibrant and active community5
- Elegant4
- Adopted by tm forum api3
- Clear for React2
- Api1
- Can deploy API to AWS API Gateway and AWS Lambda1
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Cons of JSON Server
Cons of Swagger UI
- Need to learn YAML and RAML3
- Documentation doesn't look that good2
- Doesn't generate code snippets in different languages1
- You don’t actually get in-line error highlighting1
- Does not support hypermedia1