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touchstone.locomot.io Syntax Validator
x402
touchstone.locomot.io Syntax Validator is a paid API for AI agents from touchstone.locomot.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Validates JSON, YAML, TOML, Python, or regex syntax using the canonical parser, returning a valid/invalid result plus error location on failure
Price / call$0.001
Success—
StatusUnknown
How this service works
Deterministic syntax validation — does this JSON/YAML/TOML/Python/regex parse? Valid/invalid + error location from the canonical parser. For long source use POST. Free sample, no payment required: GET /play/syntax
Output
Returns a JSON object with a boolean 'valid' field, the detected language ('lang'), the source echoed back, and either null for 'error' (if valid) or an error description with location (line/column) indicating where parsing failed.
Example use cases
Example prompt
“Can you check if this YAML is syntactically valid? `name: myapp\nversion: 1.0\nports: [8080, 9090` — I think there might be a bracket issue somewhere.”
Technical details
Endpoint
GEThttps://touchstone.locomot.io/syntaxWhen to prefer
Use this endpoint when you need deterministic, canonical-parser-based syntax checking for JSON, YAML, TOML, Python source, or regex patterns — especially when you need the exact error location (line/column) rather than a heuristic lint. Prefer over LLM-based syntax guessing when you need a ground-truth pass/fail answer. Use POST for longer source content.
Side effects
- Missing 'content' query parameter returns an error
- Missing 'lang' query parameter returns an error
- Unsupported language value returns an error
- Content too long for GET — use POST /syntax instead
- Payment not provided or x402 handshake fails — HTTP 402 returned
- Malformed request returns HTTP 400
- Regex 'test' param only applies when lang=regex; ignored otherwise
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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