Option: return errors as a tree

[lachrist]

What version of Ajv you are you using?

[email protected]

What problem do you want to solve?

Improve readability of validation.errors. Currently error reporting is provided as a flat list in validate.errors. I find this list very hard to read and use to diagnose problems on large schema / instance.

What do you think is the correct solution to problem?

Provide a tree of errors instead of a flat list. In single error mode, all the elements of the validation.errors all trace back to a single failure which made ajv failed to validate. Here is my understanding on how schema combinators should affect the tree:

• not: leaf because its child validates
• allOf: absent because it forwarded its first child failure
• anyOf: node whose children mirror the schema's children
• oneOf: either a leaf if all its child validate or a node if some of them failed

Will you be able to implement it?

I did and it and it already helped us fix some issues: ajv-error-tree. However I had the do the hacky job of reconstructing a tree from a flat list. I believe that the clean solution would be to directly generate errors as a tree and flatten it if the user requires it. Is this worth integrating in ajv?

[hyusetiawan]

just want to say, this is exactly what we are looking for, our use case is to do an audit: At which point the rules are failing. This would help us track down the specific path to the value and why it fails

[lachrist]

Hey @hyusetiawan, I developed ajv-error-tree to solve my issue. Feel free to use it directly or for inspiration.