> ## Documentation Index > Fetch the complete documentation index at: https://docs.platform.toloka.ai/docs/llms.txt > Use this file to discover all available pages before exploring further. # Start a project file upload > Send `filename` and `declaredSizeBytes`, up to 100 MiB. Returns file metadata and `uploadUrl`. PUT the file bytes to that URL with the required `x-ms-blob-type: BlockBlob` header. After the PUT succeeds, finalize the upload. ## OpenAPI ````yaml /api-reference/openapi.json post /projects/{projectId}/files openapi: 3.1.0 info: description: >- Manage projects, datasets, labeling pipelines, and model training. **Beta:** endpoints, request and response shapes, and error contracts can change without notice or a backward-compatibility promise. title: Toloka Platform API version: 2.0.0 servers: - url: https://platform.toloka.ai/api/v2-beta security: - apiKeyAuth: [] - scopedTokenAuth: [] tags: - description: The authenticated API key owner. name: Account - description: A project is the container for pipelines, datasets, and files. name: Projects - description: Rows and typed fields. Field schemas are immutable once created. name: Datasets - description: Append rows to a dataset from a file. name: Dataset uploads - description: Read a dataset out as a file. name: Dataset exports - description: A pipeline is a graph of nodes that processes each dataset item. name: Pipelines - description: The nodes, connections, fields, and version of a pipeline graph. name: Pipeline graph - description: Execute a pipeline over a dataset and inspect each item. name: Runs - description: Per-node checks that a pipeline must pass before deployment. name: Checks - description: Named credentials available to pipeline code. name: Secrets - description: Project files available to pipeline code and labeling interfaces. name: Files - description: >- Global, read-only catalog of the models a synthetic generation node can use, with their budget bounds. name: Generation models - description: >- Global, read-only catalog of the expert audience: the values a node `audience` filter can use. name: Audience - description: >- Project lists of experts a node can take its workforce from with `audienceMode: service`. Available only to teams with the audience service enabled. name: Expert lists - description: >- Experts banned in a project: they cannot be invited and are removed from the work they are in. Available only to teams with expert bans enabled. name: Expert ban list - description: Global, read-only base model catalog. name: Base models - description: Project-owned mutable model-training drafts. name: Trainings - description: Project-owned Models and immutable Model Versions. name: Models - name: Batch inference paths: /projects/{projectId}/files: post: tags: - Files summary: Start a project file upload description: >- Send `filename` and `declaredSizeBytes`, up to 100 MiB. Returns file metadata and `uploadUrl`. PUT the file bytes to that URL with the required `x-ms-blob-type: BlockBlob` header. After the PUT succeeds, finalize the upload. operationId: createProjectFileUpload parameters: - in: path name: projectId required: true schema: $ref: '#/components/schemas/ProjectId' requestBody: content: application/json: schema: properties: declaredSizeBytes: description: Declared maximum file size in bytes, up to 100 MiB. maximum: 9007199254740991 minimum: 0 type: integer filename: description: Name of the file being uploaded. minLength: 1 type: string required: - filename - declaredSizeBytes type: object responses: '200': content: application/json: schema: properties: file: $ref: '#/components/schemas/ProjectFile' uploadUrl: description: >- Signed URL for uploading file bytes with a PUT request and the `x-ms-blob-type: BlockBlob` header. type: string required: - file - uploadUrl type: object description: Upload initiated headers: RateLimit-Limit: $ref: '#/components/headers/RateLimit-Limit' RateLimit-Policy: $ref: '#/components/headers/RateLimit-Policy' RateLimit-Remaining: $ref: '#/components/headers/RateLimit-Remaining' RateLimit-Reset: $ref: '#/components/headers/RateLimit-Reset' X-Request-Id: $ref: '#/components/headers/X-Request-Id' '400': description: File size is invalid headers: RateLimit-Limit: $ref: '#/components/headers/RateLimit-Limit' RateLimit-Policy: $ref: '#/components/headers/RateLimit-Policy' RateLimit-Remaining: $ref: '#/components/headers/RateLimit-Remaining' RateLimit-Reset: $ref: '#/components/headers/RateLimit-Reset' X-Request-Id: $ref: '#/components/headers/X-Request-Id' '404': description: Project not found headers: RateLimit-Limit: $ref: '#/components/headers/RateLimit-Limit' RateLimit-Policy: $ref: '#/components/headers/RateLimit-Policy' RateLimit-Remaining: $ref: '#/components/headers/RateLimit-Remaining' RateLimit-Reset: $ref: '#/components/headers/RateLimit-Reset' X-Request-Id: $ref: '#/components/headers/X-Request-Id' '429': description: Rate limit exceeded headers: RateLimit-Limit: $ref: '#/components/headers/RateLimit-Limit' RateLimit-Policy: $ref: '#/components/headers/RateLimit-Policy' RateLimit-Remaining: $ref: '#/components/headers/RateLimit-Remaining' RateLimit-Reset: $ref: '#/components/headers/RateLimit-Reset' X-Request-Id: $ref: '#/components/headers/X-Request-Id' x-codeSamples: - label: TypeScript SDK lang: typescript source: | import { createClient } from "@toloka-platform/sdk"; const client = createClient({ baseUrl: "https://platform.toloka.ai", apiKey: process.env.TOLOKA_API_KEY!, }); const data = "Answer using the supplied context."; const upload = await client.files.startUpload({ projectId: "pp.019a0000-0000-7000-8000-000000000001", filename: "prompt.txt", declaredSizeBytes: new TextEncoder().encode(data).byteLength }); console.log(upload); components: schemas: ProjectId: description: Project ID with prefix `pp.`. pattern: >- ^pp\.[0-9a-f]{8}-[0-9a-f]{4}-[7][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$ type: string ProjectFile: description: A file stored in a project. properties: createdAt: description: Time the file upload was started, as an ISO 8601 timestamp. format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d:[0-5]\d(?:\.\d+)?(?:Z))$ type: string declaredSizeBytes: description: Declared maximum size of the file, in bytes. maximum: 9007199254740991 minimum: 0 type: integer filename: description: Name of the project file. type: string id: $ref: '#/components/schemas/ProjectFileId' projectId: $ref: '#/components/schemas/ProjectId' status: description: >- File state: `pending` before finalization, `uploaded` after successful finalization, or `failed` if the upload failed. enum: - pending - uploaded - failed type: string uploadedAt: anyOf: - format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d:[0-5]\d(?:\.\d+)?(?:Z))$ type: string - type: 'null' description: >- Time the upload was finalized, as an ISO 8601 timestamp, or null before successful finalization. uploadedSizeBytes: anyOf: - maximum: 9007199254740991 minimum: 0 type: integer - type: 'null' description: >- Finalized file size in bytes, or null before successful finalization. url: description: >- The file download endpoint. API keys and signed-in users receive a 302 redirect to the download link. Project-scoped tokens receive JSON with a `url` field. type: string required: - id - projectId - filename - status - declaredSizeBytes - uploadedSizeBytes - createdAt - uploadedAt - url type: object ProjectFileId: description: ID of the project file, with prefix `ppf.`. pattern: >- ^ppf\.[0-9a-f]{8}-[0-9a-f]{4}-[7][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$ type: string headers: RateLimit-Limit: description: The maximum number of requests allowed in the current window. schema: type: integer RateLimit-Policy: description: The rate limit policy (e.g., "60;w=60"). schema: type: string RateLimit-Remaining: description: The number of requests remaining in the current window. schema: type: integer RateLimit-Reset: description: The number of seconds until the current window resets. schema: type: integer X-Request-Id: description: >- The request id: the X-Request-Id you sent when it is 1-128 characters of letters, digits, ".", "_" or "-", otherwise a generated UUID. Present on every response, including errors; quote it when reporting a problem. schema: type: string securitySchemes: apiKeyAuth: description: >- Enter `ApiKey ` in Authorization, including the `ApiKey ` prefix. In cURL and Python samples, `` means this full value. The TypeScript SDK adds the prefix for you. in: header name: Authorization type: apiKey scopedTokenAuth: description: >- Enter the project-scoped token as `pst_...` in X-Scoped-Token, without an `ApiKey ` prefix. Create a token with POST /projects/{projectId}/tokens. in: header name: X-Scoped-Token type: apiKey ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.