> ## Documentation Index > Fetch the complete documentation index at: https://gcore.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Update template > Modify an existing template's configuration. Updates affect future applications created from this template; existing apps are not changed. ## OpenAPI ````yaml /api-reference/services_documented/fastedge_api.yaml put /fastedge/v1/template/{template_id} openapi: 3.1.0 info: title: Gcore OpenAPI – FastEdge API description: >- This OpenAPI is an aggregated OpenAPI specification that unifies all Gcore products into a single file. It covers Cloud, CDN, DNS, WAAP, DDoS Protection, Object Storage, Streaming, and FastEdge services. version: '2026-05-07T20:33:46.548242+00:00' servers: - url: https://api.gcore.com security: - APIKey: [] tags: - description: Application templates name: FastEdge Templates x-displayName: Templates - description: Client-level settings and limits name: FastEdge Clients x-displayName: Clients - description: >- Apps are descriptions of edge apps, that reference the binary and may contain app-specific settings, such as environment variables. name: Apps x-displayName: Apps - description: >- Binaries are WebAssembly executables that are actually executed when app is ran. name: Binaries x-displayName: Binaries - description: Statistics of edge app use name: Stats x-displayName: Stats - description: Secret values that can be used in apps name: FastEdge Secrets x-displayName: Secrets - description: Key-value edge storage for apps name: Edge Storage x-displayName: Edge Storage paths: /fastedge/v1/template/{template_id}: put: tags: - FastEdge Templates summary: Update template description: >- Modify an existing template's configuration. Updates affect future applications created from this template; existing apps are not changed. operationId: updateTemplate parameters: - description: Unique identifier of the template to update in: path name: template_id required: true schema: type: integer format: int64 requestBody: content: application/json: schema: $ref: '#/components/schemas/template' description: Complete template configuration (replaces existing) required: true responses: '200': content: application/json: schema: $ref: '#/components/schemas/template_short' description: Template updated successfully, returns updated metadata '400': content: application/json: schema: $ref: '#/components/schemas/error' description: Bad request '404': description: Template not found '503': content: application/json: schema: $ref: '#/components/schemas/error' description: Service temporarily unavailable x-codeSamples: - lang: Python source: |- import os from gcore import Gcore client = Gcore( api_key=os.environ.get("GCORE_API_KEY"), # This is the default and can be omitted ) template_short = client.fastedge.templates.replace( template_id=0, binary_id=12345, name="api-gateway-template", owned=True, params=[{ "data_type": "string", "mandatory": True, "name": "api_key", }], ) print(template_short.id) - lang: Go source: "package main\n\nimport (\n\t\"context\"\n\t\"fmt\"\n\n\t\"github.com/G-Core/gcore-go\"\n\t\"github.com/G-Core/gcore-go/fastedge\"\n\t\"github.com/G-Core/gcore-go/option\"\n)\n\nfunc main() {\n\tclient := gcore.NewClient(\n\t\toption.WithAPIKey(\"My API Key\"),\n\t)\n\ttemplateShort, err := client.Fastedge.Templates.Replace(\n\t\tcontext.TODO(),\n\t\t0,\n\t\tfastedge.TemplateReplaceParams{\n\t\t\tTemplate: fastedge.TemplateParam{\n\t\t\t\tBinaryID: 12345,\n\t\t\t\tName: \"api-gateway-template\",\n\t\t\t\tOwned: true,\n\t\t\t\tParams: []fastedge.TemplateParameter{{\n\t\t\t\t\tDataType: fastedge.TemplateParameterDataTypeString,\n\t\t\t\t\tMandatory: true,\n\t\t\t\t\tName: \"api_key\",\n\t\t\t\t}},\n\t\t\t},\n\t\t},\n\t)\n\tif err != nil {\n\t\tpanic(err.Error())\n\t}\n\tfmt.Printf(\"%+v\\n\", templateShort.ID)\n}\n" components: schemas: template: type: object required: - binary_id - name - params - api_type - owned properties: binary_id: type: integer format: int64 description: ID of the WebAssembly binary to use for this template example: 12345 name: type: string description: Unique name for the template (used for identification and searching) minLength: 1 maxLength: 128 pattern: ^[a-zA-Z0-9_ -]*$ example: api-gateway-template short_descr: type: string description: Brief one-line description displayed in template listings maxLength: 255 example: HTTP API gateway with authentication long_descr: type: string description: Detailed markdown description explaining template features and usage maxLength: 4096 example: >- Complete API gateway solution with JWT authentication, rate limiting, and request transformation capabilities. api_type: readOnly: true type: string description: Wasm API type owned: type: boolean description: Is the template owned by user? params: type: array description: Parameters items: $ref: '#/components/schemas/template_param' template_short: type: object required: - id - name - api_type - owned properties: id: type: integer format: int64 description: Template ID name: type: string description: Name of the template short_descr: type: string description: Short description of the template long_descr: type: string description: Long description of the template api_type: type: string description: Wasm API type owned: type: boolean description: Is the template owned by user? error: type: object required: - error properties: error: type: string description: Error message template_param: type: object required: - name - data_type - mandatory properties: name: type: string description: >- Parameter name used as a placeholder in template (e.g., `API_KEY`, `DATABASE_URL`) minLength: 1 maxLength: 64 example: api_key data_type: type: string description: >- Parameter type determines validation and UI rendering: string - text input number - numeric input date - date picker time - time picker secret - references a secret store - references an edge store bool - boolean toggle json - JSON editor or multiline text area with JSON validation enum - dropdown/select with allowed values defined via parameter metadata enum: - string - number - date - time - secret - store - bool - json - enum example: string mandatory: type: boolean description: >- If true, this parameter must be provided when instantiating the template default: false example: true descr: type: string description: Human-readable explanation of what this parameter controls example: API key for external service authentication metadata: type: string description: >- Optional JSON-encoded string for additional parameter metadata, such as allowed values for enum types securitySchemes: APIKey: description: >- API key for authentication. Make sure to include the word `apikey`, followed by a single space and then your token. Example: `apikey 1234$abcdef` type: apiKey in: header name: Authorization ````