projectdiscovery/nuclei · error

invalid parser

Error message

invalid parser

What it means

Error "invalid parser" thrown in projectdiscovery/nuclei.

Source

Thrown at pkg/catalog/loader/loader.go:446

	return ok && metadata.IsValidatedFor(!parser.NoStrictSyntax)
}

// LoadTemplateTags loads template tags count using metadata index when possible.
//
// This method is optimized for tag listing (`-tgl`) and avoids loading all
// templates into the store.
func (store *Store) LoadTemplateTags() (map[string]int, error) {
	defer store.saveMetadataIndexOnce()

	templatePaths, errs := store.config.Catalog.GetTemplatesPath(store.finalTemplates)
	store.logErroredTemplates(errs)

	tagsMap := make(map[string]int)
	indexFilter := store.indexFilter

	templatesCache := store.parserCacheOnce()
	if templatesCache == nil {
		return nil, errors.New("invalid parser")
	}

	// Include conditions require a parsed template and cannot be evaluated from
	// metadata alone.
	requiresTemplateParse := len(store.config.IncludeConditions) > 0

	for _, templatePath := range templatePaths {
		if store.metadataIndex != nil {
			if metadata, found := store.metadataIndex.Get(templatePath); found {
				if !indexFilter.Matches(metadata) {
					continue
				}

				if !requiresTemplateParse && store.metadataValidForParser(metadata) {
					for _, tag := range metadata.Tags {
						tagsMap[tag]++
					}
					continue

View on GitHub (pinned to 265b3a3dec)

When it happens

Trigger: Thrown at pkg/catalog/loader/loader.go:446 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of projectdiscovery/nuclei@265b3a3dec (2026-08-15). Data as JSON: /api/errors/61f0115a83dc6040. Report an issue: GitHub.