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I have a GraphQL server, hosted on express. I want to return images to the client by sending back nodejs buffer objects. How can i config graphql server, to return bytes, instead of json? I don't wish to do this through base64, as the image are large in size.
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GraphQL requests can be sent via HTTP POST or HTTP GET requests. GET requests must be sent in the following format. The query, variables, and operation are sent as URL-encoded query parameters in the URL. In either request method (POST or GET), only query is required.
Since the structure of a GraphQL query has anatomy we can expect JSON to be returned from the request in defined ways.
It is not required to use a dedicated GraphQL client, as it is possible to send a GraphQL query as a POST request using the Fetch API, and this is similar to the process used to submit FormData using the Fetch API.
You have to return JSON, but there's still a way. We're using GraphQL to return images stored in Blob fields in a legacy sql database. We're using sequelize, graphql-sequelize, and graphql-js. We've defined the Blob fields to be String types in our graphql schema and so they come through in the json reply just fine. Then we convert to a buffer before delivering, like
const imgBuffer = new Buffer.from(imgObj.data, 'ascii');
The only problem is we're now having trouble saving image data back to the database via the graphql interface. Our mutation function gives us a syntax error when it finds certain bad unicode characters in the strings, like \U0000 and whatnot (so I found your question looking for a solution to that).
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