How Can I Unmarshal Flexible Boolean Values (0/1 and true/false) from JSON in Go?

JSON Unmarshalling of Flexible Boolean Values

When dealing with JSON data sources that inconsistently represent boolean values as both 0/1 and false/true, the standard encoding/json package may not provide sufficient flexibility for parsing. To address this issue, we can implement a custom UnmarshalJSON method to expand the accepted boolean formats.

In the example provided, we define a struct named MyType with two boolean fields: AsBoolean and AlsoBoolean. The corresponding JSON input contains the values "true" and "1" for the respective fields.

To unmarshal both 0 and false as booleans, we create a new type ConvertibleBoolean and implement its UnmarshalJSON method. Within the method, we inspect the input data as a string and determine the corresponding boolean value based on the following conditions:

• If the string is "1" or "true," we set the boolean value to true.
• If the string is "0" or "false," we set the boolean value to false.
• Any other input results in an error with a descriptive message.

By customizing the UnmarshalJSON method, we can extend the default JSON unmarshaling behavior and accommodate the non-standard boolean representations in the input JSON data. This approach allows us to unmarshal the JSON input into the expected boolean values and populate the MyType struct accordingly.

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