CODEWITHSUNDEEP
javascripttypescriptcloudflarecloudflare-workers
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Reputation: 83

Cloudflare KV namespace doesn't bind

Ran wrangler dev and it doesn't seem to bind Worker KV:

ERROR in /src/handler.ts
./src/handler.ts 16:8-17
[tsl] ERROR in /src/handler.ts(16,9)
      TS2304: Cannot find name 'generalKV'.

Here is handler.ts:

async function postHandler(request: Request): Promise<Response> {
  let content = JSON.stringify(await request.json());
  await generalKV.put([Date.now().toString()], JSON.stringify(content));
  return new Response(content);
}

wrangler.toml:

name = "general-assignment"
type = "javascript"
account_id = "<id>"
workers_dev = true
compatibility_date = "2021-11-01"
kv_namespaces = [ 
    { binding = "generalKV", id = "<id>", preview_id = "<id>" }
]

Some suggests change kv_namespaces to kv-namespaces, but it doesn't work for me. Please inform me if I missed anything else.

Upvotes: 5

Views: 5132

Answers (2)

Drakes
Drakes

Reputation: 23660

For readers that come to this question via Google and use Wrangler v2 and get this error:

Uncaught (in promise) ReferenceError: MY_KV is not defined

The tutorials and examples neglect a second parameter (and a third parameter). This second parameter holds the environment. You can use and bind to kv with these steps:

# Create the KV namespaces
wrangler kv:namespace create "MY_KV" &&\
wrangler kv:namespace create "MY_KV" --preview

wrangler complains if there is no preview KV, so create them both. Next, create a kv_namespaces array entry and duplicate the preview_id in the default (dev) section (denoted as yyyy below).

# wrangler.toml
name = "worker"
main = "src/index.js"
compatibility_date = "2022-04-14"
account_id = "...."
workers_dev = true

routes = [
    "exmample.com/*"
]

# Duplicate preview_id to id
kv_namespaces = [
    { binding = "MY_KV", preview_id = "yyyy", id = "yyyy" }
]

# Run `wrangler publish --env production` when happy
[env.production]
kv_namespaces = [
    { binding = "MY_KV", id = "xxxx" }
]

You can then bind to kv like so:

# index.js
export default {
  async fetch(request, env) {
  ...
  const someKV = env.MY_KV.get("some-key");
  ...
  }

Upvotes: 14

David
David

Reputation: 1083

Did you already manually create the KV namespace on Cloudflare? I don't believe it creates them dynamically from the binding setup in worker (yet).

Documentation for creating via Wrangler -

https://developers.cloudflare.com/workers/cli-wrangler/commands#create

Upvotes: 0

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