Validation

Survey submissions can be validated in two ways: the Python validator and an external SurveyJS binary. Both are optional and configurable per survey.

Python validation (experimental)

Enable validation (experimental) enables a Python validation layer that checks submissions against the form schema before storing or running actions. It is useful for basic forms but may reject complex SurveyJS structures.

External SurveyJS validation (recommended for strict checks)

Force Server Side Validation runs the compiled SurveyJS validator binary (Deno build) for every submission. This uses SurveyJS’ own validation engine and provides the most accurate results for complex forms.

Binary location:

• data-validation/dist/survey-validate-macos-deno

• data-validation/dist/survey-validate-linux-deno

Payload limits

Each Survey includes Max size payload (MB). Requests larger than this limit are rejected with HTTP 413 before validation proceeds.

Error responses

Common error codes returned by @@save-poll include:

• missing_poll_result

• invalid_payload

• request_too_large

• json_too_large

• invalid_json

• missing_form_schema

• external_validator_missing

• external_validation_failed

• external_validator_error

Logging

Validation emits INFO-level logs with submission size, status, and server-side validation results.