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Substep 4C-07: Validation & Errors

Goal: Define all validation rules and error messages

EXECUTION

Let's define validation rules and error messages.

This ensures users get helpful feedback.

VALIDATION RULES

What fields or inputs need validation?

For each field, specify:

What makes it valid?
What makes it invalid?
When is it validated? (on blur, on submit, real-time?)

For each validated field: {{field_name}} validation:

Required: yes/no
Format rules:
Length limits:
Custom rules:
Validation timing:

Store validation_rules for field

ERROR MESSAGES

Now let's define error messages for each validation failure.

We'll provide messages in all supported languages.

For each validation rule: Error message when {{rule_name}} fails:

{{language}}: {{/each}}

Error code (e.g., ERR_EMAIL_INVALID):

Store error_message with code and translations

✅ Validation and errors defined!

Validated fields: {{validated_field_count}} Error messages: {{error_message_count}}

Next: We'll generate the complete specification document.

[C] Continue to 4C-08 (Generate Specification)

EXAMPLE OUTPUT

validation_rules:
  email_input:
    required: true
    format: 'valid email format'
    timing: 'on_blur and on_submit'
    rules:
      - 'Must contain @'
      - 'Must have domain'
      - 'No spaces allowed'

  password_input:
    required: true
    min_length: 8
    timing: 'on_submit'
    rules:
      - 'At least 8 characters'
      - 'Not empty'

error_messages:
  ERR_EMAIL_REQUIRED:
    en: 'Email address is required'
    sv: 'E-postadress krävs'
    field: 'email_input'

  ERR_EMAIL_INVALID:
    en: 'Please enter a valid email address'
    sv: 'Ange en giltig e-postadress'
    field: 'email_input'

  ERR_PASSWORD_REQUIRED:
    en: 'Password is required'
    sv: 'Lösenord krävs'
    field: 'password_input'

  ERR_PASSWORD_TOO_SHORT:
    en: 'Password must be at least 8 characters'
    sv: 'Lösenordet måste vara minst 8 tecken'
    field: 'password_input'

  ERR_AUTH_INVALID:
    en: 'Invalid email or password'
    sv: 'Ogiltig e-post eller lösenord'
    severity: 'critical'
    display_location: 'above_form'

NEXT STEP

Load substeps/4c-08-generate-spec.md

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