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Forest Agent Tools – JSON Diff
x402
Forest Agent Tools – JSON Diff is a paid API for AI agents from http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-22).
Deep-compares two JSON values with deterministic key ordering and index-based array semantics, returning bounded added, removed, and changed paths with before/after primitive values.
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-readable contract for active Forest paid capabilities. Unsigned paid calls return HTTP 402 with a PAYMENT-REQUIRED x402 challenge.
Output
A bounded diff result listing added paths, removed paths, and changed paths between the before and after JSON values. Changed paths include the primitive before and after values. Uses deterministic object-key ordering and explicit index-based array semantics. No network requests, model inference, persistence, or mutations are performed.
Example use cases
API response change detection
“I have two API responses saved from yesterday and today — can you diff them and tell me which fields were added, removed, or changed? Before: {"status":"active","count":5,"items":["a","b"]} and after: {"status":"inactive","count":6,"items":["a","b","c"]}.”
Config file version comparison
“My deployment config changed between releases — diff these two JSON configs for me and list every path that was modified, added, or deleted. Before is {"replicas":2,"timeout":30,"debug":true} and after is {"replicas":3,"timeout":30,"debug":false,"region":"us-east-1"}.”
Agent pipeline output audit
“I need to audit what an AI agent changed in a JSON document — given the before state {"user":"bob","score":80,"tags":["vip"]} and the after state {"user":"bob","score":95,"tags":["vip","premium"],"verified":true}, show me the exact diff with before and after values for each changed path.”
Technical details
Endpoint
POSThttps://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/json/diff?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a deterministic, structured diff of two JSON values with explicit array index tracking and reliable key ordering — especially useful for auditing agent-generated mutations, detecting API response drift, or comparing configuration snapshots. Prefer over client-side diffing when you need a paid, auditable, bounded result without writing custom comparison logic.
Side effects
- Malformed JSON in before or after fields returns an error indicating which value failed to parse
- Excessively large or deeply nested JSON may hit bounding limits and return a partial or truncated diff
- Missing before or after field in the request body results in a validation error
- Payment not included or invalid returns HTTP 402 with machine-readable payment contract
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| after | — | Public after value used to scope this lookup. |
| before | — | Public before value used to scope this lookup. |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"data": {
"equal": false,
"scope": "caller_supplied_json_structural_diff_only",
"truncated": false,
"differences": [],
"input_bytes": 0,
"nodes_visited": 0,
"array_semantics": "index_based",
"difference_count": 0
},
"meta": {
"cache": "miss",
"provider": "local-json",
"checked_at": "2026-01-01T00:00:00.000Z",
"duration_ms": 0
},
"version": "1",
"capability": "json.diff"
}
}Tags
x402
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