Summary: Reference for deploying Neon Functions with neon deploy, neon functions deploy, or the Neon API, including flags, deployment states, and slug rules. Also covers checking status, listing functions, and deleting them.

CLI and API reference for deploying and managing Neon Functions.

If your project has a neon.ts config, this is the recommended way to deploy. neon deploy reads the config and applies the entire branch policy in one step: services, per-branch tuning, and every function it declares:

neon deploy

neon deploy is an alias for neon config apply. To preview what a deploy would change without applying it, run neon config plan.

You can declare scheduled Function Triggers and custom domains in the same neon.ts config, so they deploy alongside the function.

Note that --env here takes a path to a .env file. The --env flag on neon functions deploy below takes KEY=VALUE pairs instead.

To deploy one function directly, without a neon.ts config:

neon functions deploy <slug> [--src <dir-or-entry-file>] [--env KEY=VALUE] [--wait]

By default, the CLI bundles your source with esbuild, zips the output, and uploads it. Pass --no-bundle to skip esbuild and ship a prebuilt source as-is. The first deploy creates the function; subsequent deploys update it. See the neon functions reference for the full command surface.

Note: esbuild not found

The neon CLI ships esbuild for most platforms. If bundling fails with an esbuild not found error, install it (npm install -g esbuild) or set NEON_ESBUILD_PATH to an esbuild binary. NEON_ESBUILD_PATH is read by the CLI's own bundler, not by buildFunctionBundle in @neon/config-runtime; when calling that package directly, pass a custom bundleFunction instead.

Examples:

neon functions deploy hello --src functions/hello.ts

neon functions deploy hello --src . --env RESEND_API_KEY=re_...

neon functions deploy hello --src functions/hello.ts --branch feat/my-feature

The CLI doesn't support a config-only deploy. Every neon functions deploy call bundles and uploads source, whether you pass --src or let it default to the current directory, so there's no way to change just an environment variable without also pointing at valid source, as in the example above.

For a deploy that skips bundling and updates only the environment or runtime, use the API, which accepts config-only updates.

Bundle with esbuild, zip the output, then POST to the deploy endpoint.

1. Bundle:

esbuild functions/hello.ts --bundle --platform=node --target=node24 --format=esm \
  --banner:js="import{createRequire as ___cr}from'module';import{fileURLToPath as ___f}from'url';import{dirname as ___d}from'path';const require=___cr(import.meta.url);const __filename=___f(import.meta.url);const __dirname=___d(__filename);" \
  --outfile=dist/index.mjs

Note: --format=esm is required: esbuild doesn't infer ESM output from the .mjs extension alone, and without it the runtime fails with module is not defined in ES module scope. The --banner line restores require, __filename, and __dirname for bundled CommonJS dependencies that reference them internally (as pg does); without it, the runtime fails with Dynamic require of "<module>" is not supported. buildFunctionBundle below applies the same banner automatically.

2. Zip:

zip -j function.zip dist/index.mjs

The archive's entry file must be named index.mjs or index.js; the runtime looks for those names.

From Node.js, buildFunctionBundle from @neon/config-runtime does both steps in one call and produces exactly the archive the deploy endpoint expects. See the @neon/config-runtime reference for the rest of that package's programmatic API (inspect, plan, apply), useful for calling a deploy from a custom CI step instead of the CLI:

import { buildFunctionBundle } from "@neon/config-runtime/v1";

const zip = await buildFunctionBundle({
  slug: "hello",
  name: "My first function",
  source: "./functions/hello.ts",
  env: {},
  runtime: "nodejs24",
});

3. Deploy:

curl -X POST \
  "https://console.neon.tech/api/v2/projects/{project_id}/branches/{branch_id}/functions/{slug}/deployments" \
  -H "Authorization: Bearer $NEON_API_KEY" \
  -F "zip=@function.zip" \
  -F 'environment={"MY_SECRET":"value"}'

The deploy endpoint accepts multipart/form-data. Use a zip part for code deploys and a single environment part containing the JSON-encoded map; don't send bracketed fields such as environment[KEY]=value. The first deployment for a function must include zip; later deployments can omit it for config-only changes.

The API returns immediately for code deploys. Poll the get endpoint (see Check status) until the deployment completes. Config-only deployments can complete synchronously because they reuse the latest bundle. Builds have an absolute 2-minute budget from the time the deploy is accepted; if the build can't complete within that window, the deployment fails.

The beta @neon/sdk client includes a neon.functions namespace for branch-scoped function management:

import { createNeonClient } from '@neon/sdk';
import { readFile } from 'node:fs/promises';

const neon = createNeonClient({ apiKey: process.env.NEON_API_KEY! });
const projectId = process.env.NEON_PROJECT_ID!;
const branchId = process.env.NEON_BRANCH_ID!;
const zipBytes = await readFile('function.zip');

const { data: deployment } = await neon.functions.deploy({
  projectId,
  branchId,
  slug: 'hello',
  zip: new File([zipBytes], 'function.zip', { type: 'application/zip' }),
  runtime: 'nodejs24',
  environment: JSON.stringify({ MY_SECRET: 'value' }),
});

neon.functions.deploy uses the same multipart API fields as the raw endpoint. list, get, update, and delete are also available under neon.functions.

The slug is assigned at first deploy: either the key in neon.ts or the positional argument to neon functions deploy. It becomes part of the invocation URL and can't be changed afterward. Slugs must match ^[a-z0-9]{1,20}$: lowercase letters and digits only, 1 to 20 characters, no hyphens.

CLI

neon functions get hello

API

GET /projects/{project_id}/branches/{branch_id}/functions/{slug}

The response includes invocation_url, the public URL for your function:

https://<branch_id>-<slug>.compute.<cell>.us-east-2.aws.neon.tech/

CLI

neon functions list

API

GET /projects/{project_id}/branches/{branch_id}/functions

CLI

neon functions delete hello

API

DELETE /projects/{project_id}/branches/{branch_id}/functions/{slug}

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