BamlValidationError — Boundary Documentation

The BamlValidationError class represents an error that occurs when BAML fails to parse or validate LLM output.

Type Definition

1 class BamlValidationError extends Error {
2   type: 'BamlValidationError'
3   message: string
4   prompt: string
5   raw_output: string
6 }

type

'BamlValidationError'

Literal type identifier for the error class.

message

string

Error message describing the specific validation failure.

prompt

string

The original prompt sent to the LLM.

raw_output

string

The raw output from the LLM that failed validation.

The error can be identified using TypeScript’s instanceof operator:

Type Check

1 if (error instanceof BamlValidationError) {
2   // Handle validation error
3 }

1	class BamlValidationError extends Error {
2	type: 'BamlValidationError'
3	message: string
4	prompt: string
5	raw_output: string
6	}

1	if (error instanceof BamlValidationError) {
2	// Handle validation error
3	}