Decoding JSON sum types in Go without panicking

1. go

   1 2,252 127,227 10.0 Go

   The Go programming language

   

   [2]: https://github.com/golang/go/issues/71497

2. InfluxDB

   influxdata.com featured

   InfluxDB high-performance time series database. Collect, organize, and act on massive volumes of high-resolution data to power real-time intelligent systems.

   

3. pjson

   2 3 20 4.4 Go

   Helps to easily JSON marshal / unmarshal tagged unions in go

   

   Pulled my hair out about doing this all over the place when integrating with a node api, ended up writing https://github.com/byrnedo/pjson. Feels like this should be covered as a more first class thing in go.

4. GJSON

   3 39 14,855 5.9 Go

   Get JSON values quickly - JSON parser for Go

   

   BTW double unmarshalling (and double marshalling) can be quite slow, so to speed up determining the object type you can extract the type field e.g. by using https://github.com/tidwall/gjson. It can be easily 10x faster for this kind of scenario

5. jtug

   4 1 4 1.4 Go

   JTUG - JSON Tagged Union Go

   

6. super

   5 16 1,459 9.8 Go

   An analytics database that puts JSON and relational tables on equal footing

   

   Nice article!

   Decoding sum types into Go interface values is obviously tricky stuff, but it gets even harder when you have recursive data structures as in an abstract syntax tree (AST). The article doesn't address this. Since there wasn't anything out there to do this, we built a little package called "unpack" as part of the SuperDB project.

   The package is here...

   https://github.com/brimdata/super/blob/main/pkg/unpack/refle...

   and an example use in SuperDB is here...

   https://github.com/brimdata/super/blob/main/compiler/ast/unp...

   Sorry it's not very well documented, but once we got it working, we found the approach quite powerful and easy.

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