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https://github.com/saasquatch/json-schema-inferrer

Java library for inferring JSON schema from sample JSONs
https://github.com/saasquatch/json-schema-inferrer

jackson java java-8 java-library json json-schema json-schema-inference json-schema-inferrer schemas

Last synced: 5 days ago
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Java library for inferring JSON schema from sample JSONs

Host: GitHub
URL: https://github.com/saasquatch/json-schema-inferrer
Owner: saasquatch
License: apache-2.0
Created: 2019-10-25T21:15:07.000Z (about 5 years ago)
Default Branch: main
Last Pushed: 2024-01-31T17:08:54.000Z (12 months ago)
Last Synced: 2025-01-10T09:07:43.378Z (12 days ago)
Topics: jackson, java, java-8, java-library, json, json-schema, json-schema-inference, json-schema-inferrer, schemas
Language: Java
Homepage:
Size: 2.01 MB
Stars: 170
Watchers: 12
Forks: 39
Open Issues: 0
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE

Awesome Lists containing this project

README

        # json-schema-inferrer

[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)

[![JavaCI](https://github.com/saasquatch/json-schema-inferrer/actions/workflows/JavaCI.yml/badge.svg?branch=master)](https://github.com/saasquatch/json-schema-inferrer/actions/workflows/JavaCI.yml)

[![](https://jitpack.io/v/saasquatch/json-schema-inferrer.svg)](https://jitpack.io/#saasquatch/json-schema-inferrer)

Java library for inferring JSON schema based on sample JSONs.

## Demo site

[Here is a simple demo site](https://json-schema-inferrer.herokuapp.com/) for this library that showcases some of the things it's capable of.

## Sample usage

```java

import java.util.Arrays;

import com.fasterxml.jackson.databind.JsonNode;

import com.fasterxml.jackson.databind.ObjectMapper;

import com.saasquatch.jsonschemainferrer.*;

public class Example {

  private static final ObjectMapper mapper = new ObjectMapper();

  private static final JsonSchemaInferrer inferrer = JsonSchemaInferrer.newBuilder()

      .setSpecVersion(SpecVersion.DRAFT_06)

      // Requires commons-validator

      .addFormatInferrers(FormatInferrers.email(), FormatInferrers.ip())

      .setAdditionalPropertiesPolicy(AdditionalPropertiesPolicies.notAllowed())

      .setRequiredPolicy(RequiredPolicies.nonNullCommonFields())

      .addEnumExtractors(EnumExtractors.validEnum(java.time.Month.class),

          EnumExtractors.validEnum(java.time.DayOfWeek.class))

      .build();

  public static void main(String[] args) throws Exception {

    final JsonNode sample1 = mapper.readTree(

        "{\"🙈\":\"https://saasquatch.com\",\"🙉\":[-1.5,2,\"[email protected]\",false],\"🙊\":3,\"weekdays\":[\"MONDAY\",\"TUESDAY\"]}");

    final JsonNode sample2 = mapper.readTree(

        "{\"🙈\":1,\"🙉\":{\"🐒\":true,\"🐵\":[2,\"1234:5678::\"],\"🍌\":null},\"🙊\":null,\"months\":[\"JANUARY\",\"FEBRUARY\"]}");

    final JsonNode resultForSample1 = inferrer.inferForSample(sample1);

    final JsonNode resultForSample1And2 =

        inferrer.inferForSamples(Arrays.asList(sample1, sample2));

    for (JsonNode j : Arrays.asList(sample1, sample2, resultForSample1, resultForSample1And2)) {

      System.out.println(mapper.writeValueAsString(j));

    }

  }

}

```

In the code above, `sample1` is:

```json

{

  "🙈": "https://saasquatch.com",

  "🙉": [-1.5, 2, "[email protected]", false],

  "🙊": 3,

  "weekdays": ["MONDAY", "TUESDAY"]

}

```

`sample2` is:

```json

{

  "🙈": 1,

  "🙉": { "🐒": true, "🐵": [2, "1234:5678::"], "🍌": null },

  "🙊": null,

  "months": ["JANUARY", "FEBRUARY"]

}

```

`resultForSample1` is:

```json

{

  "$schema": "http://json-schema.org/draft-06/schema#",

  "type": "object",

  "properties": {

    "🙈": { "type": "string" },

    "🙊": { "type": "integer" },

    "weekdays": { "type": "array", "items": { "enum": ["MONDAY", "TUESDAY"] } },

    "🙉": {

      "type": "array",

      "items": {

        "anyOf": [

          { "type": ["number", "boolean"] },

          { "type": "string", "format": "email" }

        ]

      }

    }

  },

  "additionalProperties": false,

  "required": ["🙈", "🙊", "weekdays", "🙉"]

}

```

And `resultForSample1And2` is:

```json

{

  "$schema": "http://json-schema.org/draft-06/schema#",

  "type": "object",

  "properties": {

    "🙈": { "type": ["string", "integer"] },

    "months": { "type": "array", "items": { "enum": ["JANUARY", "FEBRUARY"] } },

    "🙊": { "type": ["null", "integer"] },

    "weekdays": { "type": "array", "items": { "enum": ["MONDAY", "TUESDAY"] } },

    "🙉": {

      "anyOf": [

        {

          "type": "object",

          "properties": {

            "🐵": {

              "type": "array",

              "items": {

                "anyOf": [

                  { "type": "integer" },

                  { "type": "string", "format": "ipv6" }

                ]

              }

            },

            "🍌": { "type": "null" },

            "🐒": { "type": "boolean" }

          },

          "additionalProperties": false,

          "required": ["🐵", "🐒"]

        },

        {

          "type": "array",

          "items": {

            "anyOf": [

              { "type": ["number", "boolean"] },

              { "type": "string", "format": "email" }

            ]

          }

        }

      ]

    }

  },

  "additionalProperties": false,

  "required": ["🙈", "🙉"]

}

```

For more examples, see package [`com.saasquatch.jsonschemainferrer.examples`](https://github.com/saasquatch/json-schema-inferrer/tree/master/src/test/java/com/saasquatch/jsonschemainferrer/examples).

## Adding it to your project

### Add the repository

Maven

```xml

  

    jitpack.io

    https://jitpack.io

  

```

Gradle

```gradle

repositories {

  maven { url 'https://jitpack.io' }

}

```

### Add the dependency

Maven

```xml

  com.github.saasquatch

  json-schema-inferrer

  0.2.1

```

Gradle

```gradle

implementation 'com.github.saasquatch:json-schema-inferrer:0.2.1'

```

### Transitive Dependencies

This project requires Java 8. The only required transitive dependencies are [Jackson](https://github.com/FasterXML/jackson) and [FindBugs (JSR305)](http://findbugs.sourceforge.net/). If you opt into using some of the built-in [`FormatInferrers`](https://github.com/saasquatch/json-schema-inferrer/blob/master/src/main/java/com/saasquatch/jsonschemainferrer/FormatInferrers.java), [Commons Validator](https://commons.apache.org/proper/commons-validator/) will also be needed. This is encapsulated with a [Gradle feature variant](https://docs.gradle.org/current/userguide/feature_variants.html) named `builtInFormatInferrerSupport`.

### Pre-release Versions

Pre-release versions and snapshots (as well as stable releases) can be obtained through [JitPack](https://jitpack.io/#saasquatch/json-schema-inferrer).

## License

Unless explicitly stated otherwise all files in this repository are licensed under the Apache License 2.0.

License boilerplate:

```

Copyright 2023 ReferralSaaSquatch.com, Inc.

Licensed under the Apache License, Version 2.0 (the "License");

you may not use this file except in compliance with the License.

You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software

distributed under the License is distributed on an "AS IS" BASIS,

WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

See the License for the specific language governing permissions and

limitations under the License.

```