# Validate JSON syntax

> Check JSON syntax and return a clear error message when an API payload or MCP config is invalid.

Canonical: https://staticx.site/json-validator

## Check strict JSON syntax

Validate payloads, manifests, API examples, and MCP client configs before using them.

## Clear parse errors

The backend returns a readable syntax error instead of pretending invalid JSON is okay.

## Good before automation

Validate config snippets before handing them to an agent, CLI, or CI job.

## How to use JSON Validator

Confirm strict JSON syntax before using a payload in API calls, MCP clients, or deploy automation.

1. **Paste JSON** — Use the exact payload or config shape you want to check.
2. **Validate syntax** — StaticX attempts to decode it as strict JSON.
3. **Fix errors** — Correct commas, quotes, brackets, or nesting before using it elsewhere.

## JSON errors are tiny, but they stop automation cold.

A misplaced comma can break an MCP configuration, API deploy request, or integration payload. Validating before use prevents a frustrating class of mistakes.

Use placeholders for secrets when validating examples that will be shared or committed.

## JSON syntax checks

- **Strict parser** — Trailing commas, comments, and unquoted keys are rejected.
- **Works for config** — Useful for OpenAPI snippets, MCP config, and deployment payloads.
- **No schema validation** — This checks JSON syntax, not whether it matches a specific API schema.

## FAQ

### What is the difference between JSON Validator and JSON Beautifier?

Validator checks syntax. Beautifier validates and returns formatted JSON.

### Can it validate OpenAPI files?

It can validate JSON syntax, but it does not validate the OpenAPI schema rules.

### Why are comments rejected?

Standard JSON does not allow comments. Use a JSONC-aware tool if comments are required.

[View on staticx.site](https://staticx.site/json-validator)