FlowiseAI/Flowise · error · Error

Expected 'z' but got '${part}'

Error message

Expected 'z' but got '${part}'

What it means

For a non-object/non-array property value, parseZodType splits the dotted chain on '.' and requires the first segment to be the literal 'z'. This throws when a value does not start with 'z.' — e.g. 'string()', 'y.string()', or a bare literal/identifier.

Source

Thrown at packages/components/src/secureZodParser.ts:200

                    ...arrayResult,
                    modifiers: arrayWithModifiers.modifiers
                }
            }
            return this.parseArray(typeStr)
        }

        const type: { base: string; modifiers: any[]; baseArgs?: any[] } = { base: '', modifiers: [] }

        // Handle chained methods like z.string().max(500).optional()
        const parts = typeStr.split('.')

        for (let i = 0; i < parts.length; i++) {
            const part = parts[i].trim()

            if (i === 0) {
                // First part should be 'z'
                if (part !== 'z') {
                    throw new Error(`Expected 'z' but got '${part}'`)
                }
                continue
            }

            if (i === 1) {
                // Second part is the base type
                const baseMatch = part.match(/^(\w+)(\(.*\))?$/)
                if (!baseMatch) {
                    throw new Error(`Invalid base type: ${part}`)
                }

                type.base = baseMatch[1]
                if (baseMatch[2]) {
                    // Parse arguments for base type (e.g., enum values)
                    const args = this.parseArguments(baseMatch[2])
                    type.baseArgs = args
                }
            } else {

View on GitHub (pinned to abe4a8601a)

Solutions

1. Prefix the type with 'z.', e.g. 'name: z.string()'.
2. Ensure the schema source uses the global 'z' identifier only.

Example fix

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

// after
'z.object({ name: z.string() })'

function firstSegmentIsZ(value: string): boolean {
  const seg = value.split('.')[0]?.trim()
  return seg === 'z'
}

const isZodPrefixed = (v: string): boolean => /^z\./.test(v.trim())

When it happens

Trigger: 'name: string()', 'name: y.string()', 'name: "x"', or any property value whose first dotted segment is not 'z'.

Common situations: Forgetting the 'z.' namespace prefix; using a custom schema builder variable; copy-paste from JS that destructured z.

Related errors

• Failed to parse Zod schema: ${error.message}
• Schema must start with z.object()
• Invalid z.object() syntax
• Invalid object syntax
• Invalid base type: ${part}

AI-assisted analysis of FlowiseAI/Flowise@abe4a8601a (2026-08-12). Data as JSON: /api/errors/d7d9567dd1663b60. Report an issue: GitHub.