> ## Documentation Index > Fetch the complete documentation index at: https://cactal.ai/docs/llms.txt > Use this file to discover all available pages before exploring further. # Edit source files with string replacement > Atomically applies ordered exact-string edits to up to 50 files and 200 edits in total as one head version. Each `oldStr` must match once unless `replaceAll` is true, and any failing edit aborts the whole call. Set `dryRun` to validate and count replacements without committing. Requires the active lease. ## OpenAPI ````yaml /api-reference/openapi.json post /websiteSourceCode/files/str-replace openapi: 3.1.0 info: title: Cactal API version: 1.0.0 description: >- The Cactal public API. Create, edit, publish, and operate websites programmatically. Authenticate every request with an API key sent as `Authorization: Bearer `. servers: - url: https://api.cactal.ai/v1 security: - apiKey: [] tags: - name: Documentation description: >- Search and read the Cactal product documentation for concepts, guides, agent workflows, platform behavior, and API operations. - name: Feedback description: >- Submit free-form product feedback from users and agents to the Cactal feedback inbox. - name: Websites description: >- Create and manage websites — the top-level resource that owns source code, content, assets, domains, and analytics. - name: Website editors description: >- Grant, list, and revoke website-scoped editor access, and invite collaborators to a single website by email. - name: API keys description: >- Create, scope, rotate, and revoke the API keys that authenticate programmatic and agent access. - name: Source code description: >- Read and edit the framework source files of a website draft. Mutations require an edit lease. - name: Publishing description: Validate, build, publish, and roll back website versions. - name: CMS collections description: >- Define the content model: collections of structured content owned by a website. - name: CMS fields description: Manage the typed fields that make up a collection schema. - name: CMS items description: >- Create, query, publish, and organize the content entries inside a collection. - name: Domains description: >- Manage platform subdomains and custom domains, including DNS verification and the primary domain. - name: Assets description: Upload and manage website files and images served from the Cactal CDN. - name: Media generation description: >- Generate reference-guided website images that are stored as ordinary Cactal CDN assets. - name: Project Context description: >- Upload private durable reference material that the website agent can search, read, and inspect. - name: Analytics description: >- Read first-party traffic analytics for a website and export datasets as CSV. - name: Organizations description: Manage organizations, members, and organization-wide invitations. - name: Audit log description: >- Read the immutable record of actions performed in an organization by users and API keys. - name: Billing description: >- Read billing state and manage plans, site capacity, and prepaid usage balance. Every billing operation requires the organization owner role, which API keys cannot hold — today these operations are performed from the dashboard, return 403 for API-key callers, and are hidden from MCP tool lists. paths: /websiteSourceCode/files/str-replace: post: tags: - Source code summary: Edit source files with string replacement description: >- Atomically applies ordered exact-string edits to up to 50 files and 200 edits in total as one head version. Each `oldStr` must match once unless `replaceAll` is true, and any failing edit aborts the whole call. Set `dryRun` to validate and count replacements without committing. Requires the active lease. operationId: websiteSourceCode.files.strReplace requestBody: required: true content: application/json: schema: type: object properties: websiteId: type: string minLength: 1 files: minItems: 1 maxItems: 50 type: array items: type: object properties: name: type: string minLength: 1 description: >- Name of the file to edit. Singleton files are addressed by their type name, for example `global_css`. edits: minItems: 1 type: array items: type: object properties: oldStr: type: string minLength: 1 description: >- Exact text to find. Must match exactly once unless `replaceAll` is `true`. newStr: type: string description: Replacement text. replaceAll: description: >- Replace every occurrence instead of requiring a unique match. type: boolean required: - oldStr - newStr description: >- Edits applied in order against the evolving content of this file. required: - name - edits description: >- Files to edit (up to 50, and 200 edits in total). Every edit across every file commits as one version, or none of them do. dryRun: description: >- Validate every edit and report the replacement counts without committing. type: boolean leaseToken: type: string minLength: 1 required: - websiteId - files - leaseToken responses: '200': description: The new head version plus per-file replacement counts. content: application/json: schema: type: object properties: version: type: integer description: >- Head version after the edit: the previous head plus one, or the unchanged head when `changed` is `false`. changed: type: boolean description: >- `false` when the edit was a no-op and no new version was created. files: type: array items: type: object properties: name: type: string description: Name of the edited file. replacements: type: integer description: Occurrences replaced in this file. required: - name - replacements additionalProperties: false description: >- Per-file replacement counts, in request order. Reported for `dryRun` calls too, which commit nothing. required: - version - changed - files additionalProperties: false '400': description: >- Validation failed. The response `message` names the first invalid field. content: application/json: schema: $ref: '#/components/schemas/ServiceError' '401': description: Missing, invalid, expired, or revoked API key. content: application/json: schema: $ref: '#/components/schemas/ServiceError' '403': description: The authenticated principal lacks the required capability. content: application/json: schema: $ref: '#/components/schemas/ServiceError' '404': description: >- The resource does not exist or is outside the principal’s access scope. content: application/json: schema: $ref: '#/components/schemas/ServiceError' '409': description: The request conflicts with the current state of the resource. content: application/json: schema: $ref: '#/components/schemas/ServiceError' '429': description: >- Rate limit exceeded. Retry after the number of seconds in the `Retry-After` header. content: application/json: schema: $ref: '#/components/schemas/ServiceError' components: schemas: ServiceError: type: object required: - kind - message description: >- Canonical error body returned by every non-2xx response. Extra fields carry error-specific details. properties: kind: type: string enum: - validation - unauthorized - forbidden - not_found - conflict - rate_limited - internal description: Stable, machine-readable error category. message: type: string description: Human-readable explanation of the failure. suggestion: type: string description: >- What to do next when the failure has a known fix; may name the exact operation to call. validValues: type: array items: type: string description: The acceptable values for the failing field, when the set is closed. additionalProperties: true securitySchemes: apiKey: type: http scheme: bearer description: >- Cactal API key. Create one in the dashboard or via `POST /apiKeys`. The plaintext key is shown once at creation. ````