How to create json schema from json object string C#

Question

I am evaluating Json.Net.Schema from NewtonSoft and NJsonSchema from GitHub and I cannot figure out how to create a JSON schema from a JSON object. I want it to work exactly like this site does: http://jsonschema.net/#/

What I am looking for

string json = @"{""Name"": ""Bill"",""Age"": 51,""IsTall"": true}";

var jsonSchemaRepresentation = GetSchemaFromJsonObject(json);

I would expect a valid JSON schema in the jsonSchemaRepresentation variable. Does anyone know how I can accomplish this?

Thanks in advance!

What schema do you end up with in jsonSchemaRepresentation (i.e. what's wrong with it?) — DWright
– DWright, Commented Aug 27, 2016 at 20:50
The method is a made up method. I need to create a method that turns the json into its corresponding json schema. — Jerrod Horton
– Jerrod Horton, Commented Aug 28, 2016 at 13:13

Community · Accepted Answer · 2020-06-20 09:12:55Z

4

The current version of NJsonSchema supports this feature:

The SampleJsonSchemaGenerator generates a JSON Schema from sample JSON data.
var schema = JsonSchema4.FromSampleJson("...");
var schemaJson = schema.ToJson();
... or create a SampleJsonSchemaGenerator instance and call the Generate("...") method.

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Nov 5, 2018 at 20:34

Rico Suter

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1 Comment

Blue Over a year ago

Please don't just post some tool or library as an answer. At least demonstrate how it solves the problem in the answer itself.

Phonolog · Accepted Answer · 2016-09-20 19:01:55Z

1

Actually both of the libraries you mentioned do not support such a functionality.

If you're down to implement it yourself then you will have to parse your JSON, iterate over it recursively and add a new schema depending on the type of what you've just iterated over.

There are also some other tools (in other languages like python) which could be an inspiration, this might get you started.

answered Sep 20, 2016 at 19:01

Phonolog

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Rico Suter Over a year ago

Not correct, the current version of NJsonSchema supports this scenario: github.com/RSuter/NJsonSchema/wiki/SampleJsonSchemaGenerator

B. Leduc · Accepted Answer · 2016-08-27 19:40:23Z

0

The string you are submitting to the function is not in the correct format. Try this (add '{' to the start of the string, '}' to the end):

string json = @"{
""Name"": ""Bill"",
""Age"": 51,
""IsTall"": true
}";

var jsonSchemaRepresentation = GetSchemaFromJsonObject(json);

answered Aug 27, 2016 at 19:40

B. Leduc

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1 Comment

Jerrod Horton Over a year ago

Sorry, I misentered my string. I have the correct string, thanks for posting this. I have a valid json string and need a valid json schema from it.

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