API Reference

Workers

Scripts

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Versions

List Versions

GET/accounts/{account_id}/workers/scripts/{script_name}/versions

Get Version Detail

GET/accounts/{account_id}/workers/scripts/{script_name}/versions/{version_id}

Upload Version

POST/accounts/{account_id}/workers/scripts/{script_name}/versions

ModelsExpand Collapse

VersionListResponse object { id, metadata, number }

id: optional string

Unique identifier for the version.

metadata: optional object { author_email, author_id, created_on, 3 more }

author_email: optional string

Email of the user who created the version.

author_id: optional string

Identifier of the user who created the version.

created_on: optional string

When the version was created.

hasPreview: optional boolean

Whether the version can be previewed.

modified_on: optional string

When the version was last modified.

source: optional "unknown" or "api" or "wrangler" or 7 more

The source of the version upload.

One of the following:

"unknown"

"api"

"wrangler"

"terraform"

"dash"

"dash_template"

"integration"

"quick_editor"

"playground"

"workersci"

number: optional number

Sequential version number.

VersionGetResponse object { resources, id, metadata, number }

resources: object { bindings, script, script_runtime }

bindings: optional array of object { name, type } or object { instance_name, name, type, namespace } or object { name, namespace, type } or 32 more

List of bindings attached to a Worker. You can find more about bindings on our docs: https://developers.cloudflare.com/workers/configuration/multipart-upload-metadata/#bindings.

One of the following:

AI object { name, type }

name: string

A JavaScript variable name for the binding.

type: "ai"

The kind of resource that the binding provides.

AISearch object { instance_name, name, type, namespace }

instance_name: string

The user-chosen instance name. Must exist at deploy time. The worker can search, chat, update, and manage items/jobs on this instance.

name: string

A JavaScript variable name for the binding.

type: "ai_search"

The kind of resource that the binding provides.

namespace: optional string

The namespace the instance belongs to. Defaults to “default” if omitted. Customers who don’t use namespaces can simply omit this field.

AISearchNamespace object { name, namespace, type }

name: string

A JavaScript variable name for the binding.

namespace: string

The user-chosen namespace name. Must exist before deploy — Wrangler handles auto-creation on deploy failure (R2 bucket pattern). The “default” namespace is auto-created by config-api for new accounts. Grants full access (CRUD + search + chat) to all instances within the namespace.

type: "ai_search_namespace"

The kind of resource that the binding provides.

AnalyticsEngine object { dataset, name, type }

dataset: string

The name of the dataset to bind to.

name: string

A JavaScript variable name for the binding.

type: "analytics_engine"

The kind of resource that the binding provides.

Assets object { name, type }

name: string

A JavaScript variable name for the binding.

type: "assets"

The kind of resource that the binding provides.

Browser object { name, type }

name: string

A JavaScript variable name for the binding.

type: "browser"

The kind of resource that the binding provides.

D1 object { database_id, name, type, id }

database_id: string

Identifier of the D1 database to bind to.

name: string

A JavaScript variable name for the binding.

type: "d1"

The kind of resource that the binding provides.

Deprecatedid: optional string

This property has been renamed to `database_id`.

Identifier of the D1 database to bind to.

DataBlob object { name, part, type }

name: string

A JavaScript variable name for the binding.

part: string

The name of the file containing the data content. Only accepted for service worker syntax Workers.

Deprecatedtype: "data_blob"

The kind of resource that the binding provides.

DispatchNamespace object { name, namespace, type, outbound }

name: string

A JavaScript variable name for the binding.

namespace: string

The name of the dispatch namespace.

type: "dispatch_namespace"

The kind of resource that the binding provides.

outbound: optional object { params, worker }

Outbound worker.

params: optional array of object { name }

Pass information from the Dispatch Worker to the Outbound Worker through the parameters.

name: string

Name of the parameter.

worker: optional object { entrypoint, environment, service }

Outbound worker.

entrypoint: optional string

Entrypoint to invoke on the outbound worker.

environment: optional string

Environment of the outbound worker.

service: optional string

Name of the outbound worker.

DurableObjectNamespace object { name, type, class_name, 4 more }

name: string

A JavaScript variable name for the binding.

type: "durable_object_namespace"

The kind of resource that the binding provides.

class_name: optional string

The exported class name of the Durable Object.

dispatch_namespace: optional string

The dispatch namespace the Durable Object script belongs to.

environment: optional string

The environment of the script_name to bind to.

namespace_id: optional string

Namespace identifier tag.

maxLength32

script_name: optional string

The script where the Durable Object is defined, if it is external to this Worker.

Hyperdrive object { id, name, type }

id: string

Identifier of the Hyperdrive connection to bind to.

name: string

A JavaScript variable name for the binding.

type: "hyperdrive"

The kind of resource that the binding provides.

Inherit object { name, type, old_name, version_id }

name: string

The name of the inherited binding.

type: "inherit"

The kind of resource that the binding provides.

old_name: optional string

The old name of the inherited binding. If set, the binding will be renamed from old_name to name in the new version. If not set, the binding will keep the same name between versions.

version_id: optional string

Identifier for the version to inherit the binding from, which can be the version ID or the literal “latest” to inherit from the latest version. Defaults to inheriting the binding from the latest version.

Images object { name, type }

name: string

A JavaScript variable name for the binding.

type: "images"

The kind of resource that the binding provides.

Json object { json, name, type }

json: unknown

JSON data to use.

name: string

A JavaScript variable name for the binding.

type: "json"

The kind of resource that the binding provides.

KVNamespace object { name, namespace_id, type }

name: string

A JavaScript variable name for the binding.

namespace_id: string

Namespace identifier tag.

maxLength32

type: "kv_namespace"

The kind of resource that the binding provides.

Media object { name, type }

name: string

A JavaScript variable name for the binding.

type: "media"

The kind of resource that the binding provides.

MTLSCertificate object { certificate_id, name, type }

certificate_id: string

Identifier of the certificate to bind to.

name: string

A JavaScript variable name for the binding.

type: "mtls_certificate"

The kind of resource that the binding provides.

PlainText object { name, text, type }

name: string

A JavaScript variable name for the binding.

text: string

The text value to use.

type: "plain_text"

The kind of resource that the binding provides.

Pipelines object { name, pipeline, type }

name: string

A JavaScript variable name for the binding.

pipeline: string

Name of the Pipeline to bind to.

type: "pipelines"

The kind of resource that the binding provides.

Queue object { name, queue_name, type }

name: string

A JavaScript variable name for the binding.

queue_name: string

Name of the Queue to bind to.

type: "queue"

The kind of resource that the binding provides.

Ratelimit object { name, namespace_id, simple, type }

name: string

A JavaScript variable name for the binding.

namespace_id: string

Identifier of the rate limit namespace to bind to.

simple: object { limit, period }

The rate limit configuration.

limit: number

The limit (requests per period).

period: number

The period in seconds.

type: "ratelimit"

The kind of resource that the binding provides.

R2Bucket object { bucket_name, name, type, jurisdiction }

bucket_name: string

R2 bucket to bind to.

name: string

A JavaScript variable name for the binding.

type: "r2_bucket"

The kind of resource that the binding provides.

jurisdiction: optional "eu" or "fedramp" or "fedramp-high"

The jurisdiction of the R2 bucket.

One of the following:

"eu"

"fedramp"

"fedramp-high"

SecretText object { name, text, type }

name: string

A JavaScript variable name for the binding.

text: string

The secret value to use.

type: "secret_text"

The kind of resource that the binding provides.

SendEmail object { name, type, allowed_destination_addresses, 2 more }

name: string

A JavaScript variable name for the binding.

type: "send_email"

The kind of resource that the binding provides.

allowed_destination_addresses: optional array of string

List of allowed destination addresses.

allowed_sender_addresses: optional array of string

List of allowed sender addresses.

destination_address: optional string

Destination address for the email.

formatemail

Service object { name, service, type, 2 more }

name: string

A JavaScript variable name for the binding.

service: string

Name of Worker to bind to.

type: "service"

The kind of resource that the binding provides.

entrypoint: optional string

Entrypoint to invoke on the target Worker.

environment: optional string

Optional environment if the Worker utilizes one.

TextBlob object { name, part, type }

name: string

A JavaScript variable name for the binding.

part: string

The name of the file containing the text content. Only accepted for service worker syntax Workers.

Deprecatedtype: "text_blob"

The kind of resource that the binding provides.

Vectorize object { index_name, name, type }

index_name: string

Name of the Vectorize index to bind to.

name: string

A JavaScript variable name for the binding.

type: "vectorize"

The kind of resource that the binding provides.

VersionMetadata object { name, type }

name: string

A JavaScript variable name for the binding.

type: "version_metadata"

The kind of resource that the binding provides.

SecretsStoreSecret object { name, secret_name, store_id, type }

name: string

A JavaScript variable name for the binding.

secret_name: string

Name of the secret in the store.

store_id: string

ID of the store containing the secret.

type: "secrets_store_secret"

The kind of resource that the binding provides.

Flagship object { app_id, name, type }

app_id: string

ID of the Flagship app to bind to for feature flag evaluation.

maxLength128

name: string

A JavaScript variable name for the binding.

type: "flagship"

The kind of resource that the binding provides.

SecretKey object { algorithm, format, name, 4 more }

algorithm: unknown

Algorithm-specific key parameters. Learn more.

format: "raw" or "pkcs8" or "spki" or "jwk"

Data format of the key. Learn more.

One of the following:

"raw"

"pkcs8"

"spki"

"jwk"

name: string

A JavaScript variable name for the binding.

type: "secret_key"

The kind of resource that the binding provides.

usages: array of "encrypt" or "decrypt" or "sign" or 5 more

Allowed operations with the key. Learn more.

One of the following:

"encrypt"

"decrypt"

"sign"

"verify"

"deriveKey"

"deriveBits"

"wrapKey"

"unwrapKey"

key_base64: optional string

Base64-encoded key data. Required if format is “raw”, “pkcs8”, or “spki”.

key_jwk: optional unknown

Key data in JSON Web Key format. Required if format is “jwk”.

Workflow object { name, type, workflow_name, 2 more }

name: string

A JavaScript variable name for the binding.

type: "workflow"

The kind of resource that the binding provides.

workflow_name: string

Name of the Workflow to bind to.

class_name: optional string

Class name of the Workflow. Should only be provided if the Workflow belongs to this script.

script_name: optional string

Script name that contains the Workflow. If not provided, defaults to this script name.

WasmModule object { name, part, type }

name: string

A JavaScript variable name for the binding.

part: string

The name of the file containing the WebAssembly module content. Only accepted for service worker syntax Workers.

Deprecatedtype: "wasm_module"

The kind of resource that the binding provides.

VPCService object { name, service_id, type }

name: string

A JavaScript variable name for the binding.

service_id: string

Identifier of the VPC service to bind to.

type: "vpc_service"

The kind of resource that the binding provides.

VPCNetwork object { name, type, network_id, tunnel_id }

name: string

A JavaScript variable name for the binding.

type: "vpc_network"

The kind of resource that the binding provides.

network_id: optional string

Identifier of the network to bind to. Only “cf1:network” is currently supported. Mutually exclusive with tunnel_id.

tunnel_id: optional string

UUID of the Cloudflare Tunnel to bind to. Mutually exclusive with network_id.

script: optional object { etag, handlers, last_deployed_from, named_handlers }

etag: optional string

Hashed script content

handlers: optional array of string

The names of handlers exported as part of the default export.

last_deployed_from: optional string

The client most recently used to deploy this Worker.

named_handlers: optional array of object { handlers, name }

Named exports, such as Durable Object class implementations and named entrypoints.

handlers: optional array of string

The names of handlers exported as part of the named export.

name: optional string

The name of the exported class or entrypoint.

script_runtime: optional object { compatibility_date, compatibility_flags, limits, 2 more }

Runtime configuration for the Worker.

compatibility_date: optional string

Date indicating targeted support in the Workers runtime. Backwards incompatible fixes to the runtime following this date will not affect this Worker.

compatibility_flags: optional array of string

Flags that enable or disable certain features in the Workers runtime.

limits: optional object { cpu_ms }

Resource limits for the Worker.

cpu_ms: optional number

The amount of CPU time this Worker can use in milliseconds.

migration_tag: optional string

The tag of the Durable Object migration that was most recently applied for this Worker.

usage_model: optional "bundled" or "unbound" or "standard"

Usage model for the Worker invocations.

One of the following:

"bundled"

"unbound"

"standard"

id: optional string

Unique identifier for the version.

metadata: optional object { author_email, author_id, created_on, 3 more }

author_email: optional string

Email of the user who created the version.

author_id: optional string

Identifier of the user who created the version.

created_on: optional string

When the version was created.

hasPreview: optional boolean

Whether the version can be previewed.

modified_on: optional string

When the version was last modified.

source: optional "unknown" or "api" or "wrangler" or 7 more

The source of the version upload.

One of the following:

"unknown"

"api"

"wrangler"

"terraform"

"dash"

"dash_template"

"integration"

"quick_editor"

"playground"

"workersci"

number: optional number

Sequential version number.

VersionCreateResponse object { resources, id, metadata, 2 more }

resources: object { bindings, script, script_runtime }

bindings: optional array of object { name, type } or object { instance_name, name, type, namespace } or object { name, namespace, type } or 32 more

List of bindings attached to a Worker. You can find more about bindings on our docs: https://developers.cloudflare.com/workers/configuration/multipart-upload-metadata/#bindings.

One of the following:

AI object { name, type }

name: string

A JavaScript variable name for the binding.

type: "ai"

The kind of resource that the binding provides.

AISearch object { instance_name, name, type, namespace }

instance_name: string

The user-chosen instance name. Must exist at deploy time. The worker can search, chat, update, and manage items/jobs on this instance.

name: string

A JavaScript variable name for the binding.

type: "ai_search"

The kind of resource that the binding provides.

namespace: optional string

The namespace the instance belongs to. Defaults to “default” if omitted. Customers who don’t use namespaces can simply omit this field.

AISearchNamespace object { name, namespace, type }

name: string

A JavaScript variable name for the binding.

namespace: string

The user-chosen namespace name. Must exist before deploy — Wrangler handles auto-creation on deploy failure (R2 bucket pattern). The “default” namespace is auto-created by config-api for new accounts. Grants full access (CRUD + search + chat) to all instances within the namespace.

type: "ai_search_namespace"

The kind of resource that the binding provides.

AnalyticsEngine object { dataset, name, type }

dataset: string

The name of the dataset to bind to.

name: string

A JavaScript variable name for the binding.

type: "analytics_engine"

The kind of resource that the binding provides.

Assets object { name, type }

name: string

A JavaScript variable name for the binding.

type: "assets"

The kind of resource that the binding provides.

Browser object { name, type }

name: string

A JavaScript variable name for the binding.

type: "browser"

The kind of resource that the binding provides.

D1 object { database_id, name, type, id }

database_id: string

Identifier of the D1 database to bind to.

name: string

A JavaScript variable name for the binding.

type: "d1"

The kind of resource that the binding provides.

Deprecatedid: optional string

This property has been renamed to `database_id`.

Identifier of the D1 database to bind to.

DataBlob object { name, part, type }

name: string

A JavaScript variable name for the binding.

part: string

The name of the file containing the data content. Only accepted for service worker syntax Workers.

Deprecatedtype: "data_blob"

The kind of resource that the binding provides.

DispatchNamespace object { name, namespace, type, outbound }

name: string

A JavaScript variable name for the binding.

namespace: string

The name of the dispatch namespace.

type: "dispatch_namespace"

The kind of resource that the binding provides.

outbound: optional object { params, worker }

Outbound worker.

params: optional array of object { name }

Pass information from the Dispatch Worker to the Outbound Worker through the parameters.

name: string

Name of the parameter.

worker: optional object { entrypoint, environment, service }

Outbound worker.

entrypoint: optional string

Entrypoint to invoke on the outbound worker.

environment: optional string

Environment of the outbound worker.

service: optional string

Name of the outbound worker.

DurableObjectNamespace object { name, type, class_name, 4 more }

name: string

A JavaScript variable name for the binding.

type: "durable_object_namespace"

The kind of resource that the binding provides.

class_name: optional string

The exported class name of the Durable Object.

dispatch_namespace: optional string

The dispatch namespace the Durable Object script belongs to.

environment: optional string

The environment of the script_name to bind to.

namespace_id: optional string

Namespace identifier tag.

maxLength32

script_name: optional string

The script where the Durable Object is defined, if it is external to this Worker.

Hyperdrive object { id, name, type }

id: string

Identifier of the Hyperdrive connection to bind to.

name: string

A JavaScript variable name for the binding.

type: "hyperdrive"

The kind of resource that the binding provides.

Inherit object { name, type, old_name, version_id }

name: string

The name of the inherited binding.

type: "inherit"

The kind of resource that the binding provides.

old_name: optional string

The old name of the inherited binding. If set, the binding will be renamed from old_name to name in the new version. If not set, the binding will keep the same name between versions.

version_id: optional string

Identifier for the version to inherit the binding from, which can be the version ID or the literal “latest” to inherit from the latest version. Defaults to inheriting the binding from the latest version.

Images object { name, type }

name: string

A JavaScript variable name for the binding.

type: "images"

The kind of resource that the binding provides.

Json object { json, name, type }

json: unknown

JSON data to use.

name: string

A JavaScript variable name for the binding.

type: "json"

The kind of resource that the binding provides.

KVNamespace object { name, namespace_id, type }

name: string

A JavaScript variable name for the binding.

namespace_id: string

Namespace identifier tag.

maxLength32

type: "kv_namespace"

The kind of resource that the binding provides.

Media object { name, type }

name: string

A JavaScript variable name for the binding.

type: "media"

The kind of resource that the binding provides.

MTLSCertificate object { certificate_id, name, type }

certificate_id: string

Identifier of the certificate to bind to.

name: string

A JavaScript variable name for the binding.

type: "mtls_certificate"

The kind of resource that the binding provides.

PlainText object { name, text, type }

name: string

A JavaScript variable name for the binding.

text: string

The text value to use.

type: "plain_text"

The kind of resource that the binding provides.

Pipelines object { name, pipeline, type }

name: string

A JavaScript variable name for the binding.

pipeline: string

Name of the Pipeline to bind to.

type: "pipelines"

The kind of resource that the binding provides.

Queue object { name, queue_name, type }

name: string

A JavaScript variable name for the binding.

queue_name: string

Name of the Queue to bind to.

type: "queue"

The kind of resource that the binding provides.

Ratelimit object { name, namespace_id, simple, type }

name: string

A JavaScript variable name for the binding.

namespace_id: string

Identifier of the rate limit namespace to bind to.

simple: object { limit, period }

The rate limit configuration.

limit: number

The limit (requests per period).

period: number

The period in seconds.

type: "ratelimit"

The kind of resource that the binding provides.

R2Bucket object { bucket_name, name, type, jurisdiction }

bucket_name: string

R2 bucket to bind to.

name: string

A JavaScript variable name for the binding.

type: "r2_bucket"

The kind of resource that the binding provides.

jurisdiction: optional "eu" or "fedramp" or "fedramp-high"

The jurisdiction of the R2 bucket.

One of the following:

"eu"

"fedramp"

"fedramp-high"

SecretText object { name, text, type }

name: string

A JavaScript variable name for the binding.

text: string

The secret value to use.

type: "secret_text"

The kind of resource that the binding provides.

SendEmail object { name, type, allowed_destination_addresses, 2 more }

name: string

A JavaScript variable name for the binding.

type: "send_email"

The kind of resource that the binding provides.

allowed_destination_addresses: optional array of string

List of allowed destination addresses.

allowed_sender_addresses: optional array of string

List of allowed sender addresses.

destination_address: optional string

Destination address for the email.

formatemail

Service object { name, service, type, 2 more }

name: string

A JavaScript variable name for the binding.

service: string

Name of Worker to bind to.

type: "service"

The kind of resource that the binding provides.

entrypoint: optional string

Entrypoint to invoke on the target Worker.

environment: optional string

Optional environment if the Worker utilizes one.

TextBlob object { name, part, type }

name: string

A JavaScript variable name for the binding.

part: string

The name of the file containing the text content. Only accepted for service worker syntax Workers.

Deprecatedtype: "text_blob"

The kind of resource that the binding provides.

Vectorize object { index_name, name, type }

index_name: string

Name of the Vectorize index to bind to.

name: string

A JavaScript variable name for the binding.

type: "vectorize"

The kind of resource that the binding provides.

VersionMetadata object { name, type }

name: string

A JavaScript variable name for the binding.

type: "version_metadata"

The kind of resource that the binding provides.

SecretsStoreSecret object { name, secret_name, store_id, type }

name: string

A JavaScript variable name for the binding.

secret_name: string

Name of the secret in the store.

store_id: string

ID of the store containing the secret.

type: "secrets_store_secret"

The kind of resource that the binding provides.

Flagship object { app_id, name, type }

app_id: string

ID of the Flagship app to bind to for feature flag evaluation.

maxLength128

name: string

A JavaScript variable name for the binding.

type: "flagship"

The kind of resource that the binding provides.

SecretKey object { algorithm, format, name, 4 more }

algorithm: unknown

Algorithm-specific key parameters. Learn more.

format: "raw" or "pkcs8" or "spki" or "jwk"

Data format of the key. Learn more.

One of the following:

"raw"

"pkcs8"

"spki"

"jwk"

name: string

A JavaScript variable name for the binding.

type: "secret_key"

The kind of resource that the binding provides.

usages: array of "encrypt" or "decrypt" or "sign" or 5 more

Allowed operations with the key. Learn more.

One of the following:

"encrypt"

"decrypt"

"sign"

"verify"

"deriveKey"

"deriveBits"

"wrapKey"

"unwrapKey"

key_base64: optional string

Base64-encoded key data. Required if format is “raw”, “pkcs8”, or “spki”.

key_jwk: optional unknown

Key data in JSON Web Key format. Required if format is “jwk”.

Workflow object { name, type, workflow_name, 2 more }

name: string

A JavaScript variable name for the binding.

type: "workflow"

The kind of resource that the binding provides.

workflow_name: string

Name of the Workflow to bind to.

class_name: optional string

Class name of the Workflow. Should only be provided if the Workflow belongs to this script.

script_name: optional string

Script name that contains the Workflow. If not provided, defaults to this script name.

WasmModule object { name, part, type }

name: string

A JavaScript variable name for the binding.

part: string

The name of the file containing the WebAssembly module content. Only accepted for service worker syntax Workers.

Deprecatedtype: "wasm_module"

The kind of resource that the binding provides.

VPCService object { name, service_id, type }

name: string

A JavaScript variable name for the binding.

service_id: string

Identifier of the VPC service to bind to.

type: "vpc_service"

The kind of resource that the binding provides.

VPCNetwork object { name, type, network_id, tunnel_id }

name: string

A JavaScript variable name for the binding.

type: "vpc_network"

The kind of resource that the binding provides.

network_id: optional string

Identifier of the network to bind to. Only “cf1:network” is currently supported. Mutually exclusive with tunnel_id.

tunnel_id: optional string

UUID of the Cloudflare Tunnel to bind to. Mutually exclusive with network_id.

script: optional object { etag, handlers, last_deployed_from, named_handlers }

etag: optional string

Hashed script content

handlers: optional array of string

The names of handlers exported as part of the default export.

last_deployed_from: optional string

The client most recently used to deploy this Worker.

named_handlers: optional array of object { handlers, name }

Named exports, such as Durable Object class implementations and named entrypoints.

handlers: optional array of string

The names of handlers exported as part of the named export.

name: optional string

The name of the exported class or entrypoint.

script_runtime: optional object { compatibility_date, compatibility_flags, limits, 2 more }

Runtime configuration for the Worker.

compatibility_date: optional string

Date indicating targeted support in the Workers runtime. Backwards incompatible fixes to the runtime following this date will not affect this Worker.

compatibility_flags: optional array of string

Flags that enable or disable certain features in the Workers runtime.

limits: optional object { cpu_ms }

Resource limits for the Worker.

cpu_ms: optional number

The amount of CPU time this Worker can use in milliseconds.

migration_tag: optional string

The tag of the Durable Object migration that was most recently applied for this Worker.

usage_model: optional "bundled" or "unbound" or "standard"

Usage model for the Worker invocations.

One of the following:

"bundled"

"unbound"

"standard"

id: optional string

Unique identifier for the version.

metadata: optional object { author_email, author_id, created_on, 3 more }

author_email: optional string

Email of the user who created the version.

author_id: optional string

Identifier of the user who created the version.

created_on: optional string

When the version was created.

hasPreview: optional boolean

Whether the version can be previewed.

modified_on: optional string

When the version was last modified.

source: optional "unknown" or "api" or "wrangler" or 7 more

The source of the version upload.

One of the following:

"unknown"

"api"

"wrangler"

"terraform"

"dash"

"dash_template"

"integration"

"quick_editor"

"playground"

"workersci"

number: optional number

Sequential version number.

startup_time_ms: optional number

Time in milliseconds spent on Worker startup.