A tool written in Clojure to perform basic schema inference on JSON inputs, and output a description of the inferred schema.
This project provides two namespaces, jb.core and jb.browse.
This module exposes infer-schema, a function that returns a Schema Descriptor given any piece of data.
This module exposes browse, a function that takes a piece of data and returns a compact, human-friendly summary of the input's Schema Descriptor.
Consider the following JSON object:
{
"foo": 4,
"bar": [{
"baz": "value",
"nullableField": "not null"
}, {
"baz": "another one",
"optional": 42,
"nullableField": null
}]
}
If that object is in the file data.json, we can pipe it through jb.core to see the generated Schema Descriptor
$ cat data.json | lein run -m jb.core
{
"jb.core/id" : "jb.core/schema.id.object",
"jb.core/schema.data.object" : {
"foo" : {
"jb.core/id" : "jb.core/type.id.always",
"jb.core/schema" : {
"jb.core/id" : "jb.core/schema.id.primitive",
"jb.core/schema.data.primitive" : "java.lang.Integer"
}
},
"bar" : {
"jb.core/id" : "jb.core/type.id.always",
"jb.core/schema" : {
"jb.core/id" : "jb.core/schema.id.listof",
"jb.core/schema.data.listof" : {
"jb.core/id" : "jb.core/type.id.always",
"jb.core/schema" : {
"jb.core/id" : "jb.core/schema.id.object",
"jb.core/schema.data.object" : {
"optional" : {
"jb.core/id" : "jb.core/type.id.maybe",
"jb.core/schema" : {
"jb.core/id" : "jb.core/schema.id.primitive",
"jb.core/schema.data.primitive" : "java.lang.Integer"
}
},
"baz" : {
"jb.core/id" : "jb.core/type.id.always",
"jb.core/schema" : {
"jb.core/id" : "jb.core/schema.id.primitive",
"jb.core/schema.data.primitive" : "java.lang.String"
}
},
"nullableField" : {
"jb.core/id" : "jb.core/type.id.always",
"jb.core/schema" : {
"jb.core/id" : "jb.core/schema.id.union",
"jb.core/schema.data.union" : [ {
"jb.core/id" : "jb.core/schema.id.primitive",
"jb.core/schema.data.primitive" : null
}, {
"jb.core/id" : "jb.core/schema.id.primitive",
"jb.core/schema.data.primitive" : "java.lang.String"
} ]
}
}
}
}
}
}
}
}
}
Consumers of jb.core/infer-schema will see namespaced keywords where you see "jb.core/*" above.
For a more readable summary of the schema, we can use jb.browse.
$ cat data.json | lein run -m jb.browse
{
"foo" : "java.lang.Integer",
"bar" : [ {
"optional" : {
"maybe" : "java.lang.Integer"
},
"baz" : "java.lang.String",
"nullableField" : {
"union" : [ null, "java.lang.String" ]
}
} ]
}
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