JsonParseException while using multi line base64 encoded value with type string

[Sai Srikar Mutya]

Hello there,

While using a base64 encoded value which can have multiple lines, Swagger is throwing a JsonParseException as it is not escaping characters correctly and putting into a JSON to validate against the schema.

[Sven Döring]

JSON can't have multiline strings. Not even as Base64 encoded byte array. Therefore the JsonParseException is right - your JSON is invalid.

See http://json.org/ for more information on the String definition. A new line has to be escaped with \n.

[Sai Srikar Mutya]

@Sven Doring

I understand that a json cannot have multi line values. But I am talking about a string value which is Base64 encoded which can be a multi line.

My requirement is simple, I want to have query parameter which is Base64 encoded value (Base64 encoded value can have newline characters). This is something swagger is not allowing.

Is there an alternative to this??

[Sven Döring]

How is it defined in your OpenAPI definition? As type string with format base64?

[Sai Srikar Mutya]

I was using the format as byte which takes care of base64 values as per the below link

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[https://swagger.io/docs/specification/data-models/data-types/](https://swagger.io/docs/specification/data-models/data-types/)

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• byte – base64-encoded characters, for example, U3dhZ2dlciByb2Nrcw==

[Sven Döring]

There is an issue on GitHub for Jackson addressing multiline Base64 strings. https://github.com/FasterXML/jackson-core/issues/414

Some sort of fix was released with version 2.9.4.

Which version is used by the OpenAPI validator? I vaguely remember something about version 2.8.x.

Can you try it with a newer 2.9.x version?

‌

Edit:

Since version 1.4.0 of the Swagger Request Validator it uses Jackson 2.9.5.

So, right now, the used JSON decoder does not support multiline Base64 strings.