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AgentTools JSON Formatter & Validator
x402
AgentTools JSON Formatter & Validator is a paid API for AI agents from agenttools-hub.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).
Validates JSON with precise error messages, pretty-prints it with configurable indentation, and reports the top-level type and element count.
Price / call$0.001
Success—
StatusUnknown
How this service works
Validate JSON with precise error messages, pretty-print it with any indent, and inspect its top-level type and element counts. Use this when an agent needs to validate, pretty-print and inspect JSON.
Output
Returns a validation status (valid or error with precise error message), the pretty-printed JSON string formatted with the requested indentation, the top-level type (object, array, string, number, boolean, null), and the count of top-level elements or keys.
Example use cases
Debugging malformed API response
“I got this JSON back from an API and it's failing to parse — can you validate it and give me the exact error: '{"user":{"id":42,"name":"Bob","roles":["admin","editor"}}'?”
Readable formatting for code review
“This minified JSON blob is impossible to read — can you pretty-print it with 4-space indentation so I can review the structure? Here it is: '{"config":{"timeout":30,"retries":3,"endpoints":["a","b"]}}'”
Inspecting structure of unknown JSON
“Tell me the top-level type and how many elements are in this JSON so I know what I'm working with: '[{"id":1},{"id":2},{"id":3}]'”
Technical details
Endpoint
GEThttps://agenttools-hub.vercel.app/api/v1/dev/json-formatter?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to quickly validate, format, or inspect JSON without running code — especially useful when an agent receives raw JSON from an external source and needs to confirm its validity before further processing, or when a human-readable formatted version is needed for display or debugging. Prefer this over writing custom parsing logic when the task is purely structural inspection or beautification.
Side effects
- Missing required 'json' query parameter returns an error
- Malformed JSON input returns a validation error with a descriptive message indicating the parse failure location
- Invalid indent value (non-numeric) may cause unexpected formatting behavior
- Extremely large JSON payloads may hit URL length limits since input is passed as a query parameter
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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