FlowiseAI/Flowise · error · Error

Unsupported modifier

Error message

Unsupported modifier: ${modifier.name}

What it means

validateTypeInfo requires every modifier name to be in ALLOWED_TYPES = [string, number, int, boolean, date, object, array, enum, optional, max, min, describe, default]. So .email(), .url(), .regex(), .nonempty(), .length(), .transform(), .refine() all fail; only modifiers in the list (e.g. .optional, .max, .min, .int, .describe, .default, .array) pass validation. Note the list conflates base types and modifiers by design.

Solutions

1. Drop unsupported modifiers and enforce constraints via the allowed ones (.max, .min, .describe, .default, .optional).
2. For format validation (email/url), validate in your own code on the parsed value instead of in the schema string.
3. If you control the parser, extend ALLOWED_TYPES and add a case in applyModifiers for the new modifier.

Example fix

// before
'z.object({ email: z.string().email() })'

// after
'z.object({ email: z.string().max(254).describe("email") })' // format checked in app code

const SUPPORTED_MODS = new Set(['optional','max','min','int','describe','default','array'])
function onlyAllowedModifiers(schema: string): boolean {
  return !/\.(email|url|regex|nonempty|length|transform|refine|includes|startsWith|endsWith|ip|cuid|uuid|datetime)\b/.test(schema)
}

const SUPPORTED = new Set(['string','number','int','boolean','date','object','array','enum','optional','max','min','describe','default'])
const isAllowedModifier = (name: string): boolean => SUPPORTED.has(name)

When it happens

Trigger: Chaining format/refinement validators like '.email()', '.url()', '.regex(/.../)', '.nonempty()', '.length(5)', '.transform(...)', '.refine(...)'.

Common situations: Bringing in validation idioms from full Zod; enforcing email/url formats via modifiers.

Related errors

• Unsupported type
• enum requires array of values
• Error parsing Zod Schema
• Invalid modifier
• Maximum recursion depth reached in parseWithTypeConversion

AI-assisted analysis of FlowiseAI/Flowise@abe4a8601a (2026-08-12). Data as JSON: /api/errors/a017573255e34799. Report an issue: GitHub.

Appendix: source

Thrown at packages/components/src/secureZodParser.ts:298

            }
            return
        }

        // If it's a simple array, validate the inner type
        if (typeInfo.isSimpleArray) {
            this.validateTypeInfo(typeInfo.innerType)
            return
        }

        // Validate base type
        if (!this.ALLOWED_TYPES.includes(typeInfo.base)) {
            throw new Error(`Unsupported type: ${typeInfo.base}`)
        }

        // Validate modifiers
        for (const modifier of typeInfo.modifiers || []) {
            if (!this.ALLOWED_TYPES.includes(modifier.name)) {
                throw new Error(`Unsupported modifier: ${modifier.name}`)
            }
        }
    }

    private static parseArguments(argsStr: string): any[] {
        // Remove outer parentheses
        const inner = argsStr.slice(1, -1).trim()
        if (!inner) return []

        // Simple argument parsing for basic cases
        if (inner.startsWith('[') && inner.endsWith(']')) {
            // Array argument
            const arrayContent = inner.slice(1, -1)
            return [this.parseArrayContent(arrayContent)]
        } else if (inner.match(/^\d+$/)) {
            // Number argument
            return [parseInt(inner, 10)]
        } else if (inner.startsWith('"') && inner.endsWith('"')) {

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