# NAKONETS JavaScript Syntax Checker

> NAKONETS JavaScript Syntax Checker is a paid API for AI agents from x402vercel.vercel.app, paid per call via x402, $0.5/call, status unknown (last checked 2026-10-02).

Validates JavaScript source code for syntax errors, returning a boolean indicating whether the code is syntactically valid.

## Facts

- Endpoint: POST https://x402vercel.vercel.app/api/code/js-syntax?utm_source=zero.xyz
- Price: $0.5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nakonets-javascript-syntax-checker-ec7f8709
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EEcKcOrutp8Sw80dcU4fV

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability nakonets-javascript-syntax-checker-ec7f8709 -d '<json body>'
```

Example prompt: Can you check if this JavaScript snippet is syntactically valid: `function greet(name) { return 'Hello, ' + name; }`?

## When to prefer this

Choose this endpoint when you need a fast, deterministic, pay-per-call JavaScript syntax check — particularly useful in CI pipelines, agent-generated code workflows, or preflight validation before executing or deploying JS snippets. It is not a full linter or type-checker; prefer it over heavier tools when you just need a quick parse-validity signal without setting up a local Node.js environment.

## Known failure modes

- Empty or missing `text` field may return an error or unexpected result
- Very large JavaScript files may hit payload size limits
- The endpoint validates syntax only — it does not catch runtime errors, type errors, or logical bugs
- Non-JavaScript languages submitted as text will likely return false
- Network or payment authorization failures return 402 if x402 payment is not properly attached

## How this service works

Pay-per-call deterministic utilities for CI diagnosis, data validation, JavaScript syntax checks, market snapshots and opportunity preflight.

## Output

Returns a JSON object with a `validSyntax` boolean field — `true` if the submitted JavaScript text parses without errors, `false` if there are syntax errors. No error details or line numbers are returned in the current schema.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string",
   "description": "JavaScript source text to syntax-check"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "validSyntax": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nakonets-javascript-syntax-checker-ec7f8709/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402vercel.vercel.app](https://www.zero.xyz/host/x402vercel.vercel.app/llms.txt)