Can anyone guide me on implementing the if-then-else condition within a json schema?

Question

Can anyone guide me on implementing the if-then-else condition within a json schema?

In the latest version of JSON Schema (draft-07), a new feature has been introduced with the if, then, and else keywords. I'm struggling to grasp how to properly utilize these new keywords. Below is the JSON Schema I have created:

{
    "type": "object",
    "properties": {
        "foo": {
            "type": "string"
        },
        "bar": {
            "type": "string"
        }
    },
    "if": {
        "properties": {
            "foo": {
                "enum": [
                    "bar"
                ]
            }
        }
    },
    "then": {
        "required": [
            "bar"
        ]
    }
}

When the foo property is equal to "bar", the existence of the bar property becomes necessary. This behavior is as expected.

However, when the foo property is missing or the input is empty, I don't want anything to happen. How can this be achieved?

Empty Input:

{}

Found Errors:
    Required properties are missing from object: bar.
    Schema path: #/then/required

I rely on an online validation tool for testing:

json validation json.net jsonschema

Answer 1

Answer №1

When using the if keyword, it signifies that if the value schema successfully passes validation, the then schema will be applied; otherwise, the else schema will be applied.

The reason your schema failed is because you forgot to include "foo" as a requirement in your if schema. This resulted in an empty JSON instance passing the validation of the if schema and thus triggering the then schema, which specifically requires "bar".

Additionally, make sure to set "propertyNames":false to avoid having any keys in the schema. If you were to use "else": false, everything would always fail validation.

{
  "type": "object",
  "properties": {
    "foo": {
      "type": "string"
    },
    "bar": {
      "type": "string"
    }
  },
  "if": {
    "properties": {
      "foo": {
        "enum": [
          "bar"
        ]
      }
    },
    "required": [
      "foo"
    ]
  },
  "then": {
    "required": [
      "bar"
    ]
  },
  "else": false
}

Answer 2

When using the if keyword, it signifies that if the value schema successfully passes validation, the then schema will be applied; otherwise, the else schema will be applied.

The reason your schema failed is because you forgot to include "foo" as a requirement in your if schema. This resulted in an empty JSON instance passing the validation of the if schema and thus triggering the then schema, which specifically requires "bar".

Additionally, make sure to set "propertyNames":false to avoid having any keys in the schema. If you were to use "else": false, everything would always fail validation.

{
  "type": "object",
  "properties": {
    "foo": {
      "type": "string"
    },
    "bar": {
      "type": "string"
    }
  },
  "if": {
    "properties": {
      "foo": {
        "enum": [
          "bar"
        ]
      }
    },
    "required": [
      "foo"
    ]
  },
  "then": {
    "required": [
      "bar"
    ]
  },
  "else": false
}

Answer 3

Answer №2

Is it possible to utilize the "else" property in this scenario?

{
    "type": "object",
    "properties": {
        "foo": { "type": "string" },
        "bar": { "type": "string" }
     },
     "if": {
        "properties": {
            "foo": { 
              "enum": ["bar"] 
            }
        }
    },
    "then": { 
      "required": ["bar"]
    },
    "else": {
      "required": [] 
    }
}

Answer 4

Is it possible to utilize the "else" property in this scenario?

{
    "type": "object",
    "properties": {
        "foo": { "type": "string" },
        "bar": { "type": "string" }
     },
     "if": {
        "properties": {
            "foo": { 
              "enum": ["bar"] 
            }
        }
    },
    "then": { 
      "required": ["bar"]
    },
    "else": {
      "required": [] 
    }
}

Answer 5

Answer №3

When it comes to checking conditions and making decisions in JSON schema, you can utilize the classical If-Then-Else structure or nest if statements as required. For more information, refer to this documentation here. Here is an example where Variable0 - Variable5 are the variables to be checked and required_field[number] indicates the field that will be required if the condition holds true.

{
  "additionalProperties": false,
  "allOf": [
    {
      "if": {
        "properties": {
          "Variable0": {
            "const": "Yes"
          }
        }
      },
      "then": {
        "if": {
          "properties": {
            "Variable1": {
              "const": "Yes"
            }
          }
        },
        "then": {
          "if": {
            "properties": {
              "Variable2": {
                "const": "Yes"
              }
            }
          },
          "then": {
            "required": [
              "required_field2"
            ]
          },
          "else": {
            "if": {
              "properties": {
                "Variable3": {
                  "const": "Yes"
                }
              }
            },
            "then": {
              "required": [
                "required_field3"
              ]
            },
            "else": {
              "if": {
                "properties": {
                  "Variable4": {
                    "const": "Yes"
                  }
                }
              },
              "then": {
                "required": [
                  "required_field4"
                ]
              },
              "else": {
                "if": {
                  "properties": {
                    "Variable5": {
                      "const": "Yes"
                    }
                  }
                },
                "then": {
                  "required": [
                    "required_field5"
                  ]
                }
              }
            }
          }
        }
      }
    }
  ]
}

Answer 6

When it comes to checking conditions and making decisions in JSON schema, you can utilize the classical If-Then-Else structure or nest if statements as required. For more information, refer to this documentation here. Here is an example where Variable0 - Variable5 are the variables to be checked and required_field[number] indicates the field that will be required if the condition holds true.

{
  "additionalProperties": false,
  "allOf": [
    {
      "if": {
        "properties": {
          "Variable0": {
            "const": "Yes"
          }
        }
      },
      "then": {
        "if": {
          "properties": {
            "Variable1": {
              "const": "Yes"
            }
          }
        },
        "then": {
          "if": {
            "properties": {
              "Variable2": {
                "const": "Yes"
              }
            }
          },
          "then": {
            "required": [
              "required_field2"
            ]
          },
          "else": {
            "if": {
              "properties": {
                "Variable3": {
                  "const": "Yes"
                }
              }
            },
            "then": {
              "required": [
                "required_field3"
              ]
            },
            "else": {
              "if": {
                "properties": {
                  "Variable4": {
                    "const": "Yes"
                  }
                }
              },
              "then": {
                "required": [
                  "required_field4"
                ]
              },
              "else": {
                "if": {
                  "properties": {
                    "Variable5": {
                      "const": "Yes"
                    }
                  }
                },
                "then": {
                  "required": [
                    "required_field5"
                  ]
                }
              }
            }
          }
        }
      }
    }
  ]
}

Answer 7

Answer №4

When dealing with a json schema within an html file, it is possible to incorporate php code for additional customization and dynamic content display. This can be achieved by using the echo function in php to output specific strings based on different scenarios or conditions present in the json data.

<script type="application/ld+json">
{
  "@context": "https://schema.org/",
  "@type": "Product",
  "name": "Product",
  "image": "image",
  "description": "description",
  "brand": {
    "@type": "Brand",
    "name": "brand"
  },
  "offers": {
    "@type": "Offer",
    "url": "url",
    "priceCurrency": "currency",
    "price": "5000",
    "availability": "http://schema.org/InStock",
    "itemCondition": "https://schema.org/NewCondition"
  }<?php if ($aggregateRating) echo ',' ?>
  <?php if ($aggregateRating) echo '
  "aggregateRating": {
    "@type": "AggregateRating",
    "ratingValue": "' . $ratingValue . '",
    "ratingCount": "' . $ratingCount . '",
    "bestRating": "' . $bestRating . '",
    "worstRating": "' . $worstRating . '"
  }';
  ?>
}
</script>

Answer 8

When dealing with a json schema within an html file, it is possible to incorporate php code for additional customization and dynamic content display. This can be achieved by using the echo function in php to output specific strings based on different scenarios or conditions present in the json data.

<script type="application/ld+json">
{
  "@context": "https://schema.org/",
  "@type": "Product",
  "name": "Product",
  "image": "image",
  "description": "description",
  "brand": {
    "@type": "Brand",
    "name": "brand"
  },
  "offers": {
    "@type": "Offer",
    "url": "url",
    "priceCurrency": "currency",
    "price": "5000",
    "availability": "http://schema.org/InStock",
    "itemCondition": "https://schema.org/NewCondition"
  }<?php if ($aggregateRating) echo ',' ?>
  <?php if ($aggregateRating) echo '
  "aggregateRating": {
    "@type": "AggregateRating",
    "ratingValue": "' . $ratingValue . '",
    "ratingCount": "' . $ratingCount . '",
    "bestRating": "' . $bestRating . '",
    "worstRating": "' . $worstRating . '"
  }';
  ?>
}
</script>

Can anyone guide me on implementing the if-then-else condition within a json schema?

Answer №1

Answer №2

Answer №3

Answer №4

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