Learn to build a GraphQL API with Golang to upload files to DigitalOcean Spaces using multipart mutations and the AWS SDK for Go v2.

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Step-by-step guide to building a GraphQL API in Go that handles file uploads to DigitalOcean Spaces. Uses gqlgen for schema-first API generation with the Upload scalar type, the AWS SDK for Go v2 for S3-compatible uploads, go-pg for PostgreSQL integration, and godotenv for environment management. Covers bootstrapping the project, defining the schema, implementing CreateUser and UploadProfileImage mutation resolvers, connecting to a managed PostgreSQL database, and uploading files via multipart HTTP requests. Also includes a comparison of server-side upload vs presigned URLs, a troubleshooting table for common errors, and an FAQ section.

Build a GraphQL API in Go to Upload Files to Spaces

Understanding the GraphQL Multipart Request Specification

Step 1 — Bootstrapping a Golang GraphQL API

Step 2 — Defining the GraphQL Application Schema

Step 3 — Generating the Application Resolvers

Step 4 — Provisioning and Using a Managed Database Instance on DigitalOcean

Step 5 — Implementing the Generated Resolvers

Step 6 — Uploading Images to DigitalOcean Spaces

Choosing Between Server-Side Upload and Presigned URLs