Exact UTF-8 JSON batch encoder
WHEN TO USE: Produce contiguous, greedy, byte-bounded JSON-array or LF-terminated NDJSON wire bodies from supplied JSON values. Counts actual UTF-8 bodies including framing and escaping; optional SHA-256 hashes those unchanged bytes. Uses recursive key sorting plus JSON.stringify, not RFC 8785; rejects malformed Unicode and oversized records without partial batches. No transmission, endpoint-limit verification, compression or token accounting.
structured · Operation ID: json-batch-encode
Choose this operation when
- Encode exact byte-limited JSON array or NDJSON request payload batches
- Pack JSON records into contiguous UTF-8-sized bodies without splitting records
- Measure escaped JSON framing and hash unchanged batch wire bytes
Outside this profile
- Sending requests, validating target endpoint schemas or actual server limits, sizing headers, HTTP framing, compression or tokenization
- Arbitrary-precision JSON numbers or RFC 8785 cryptographic canonicalization
- Fetching data, executing caller code, contacting agents, transmitting a payload, or changing remote state
- Verifying semantic truth, source authenticity, identity, permissions, or business relationships
Exact release references
Static JSON contract · Markdown reference · Fixed example response
Complete input schema
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"properties": {
"records": {
"maxItems": 500,
"type": "array",
"items": {
"$ref": "#/$defs/__schema0"
}
},
"framing": {
"type": "string",
"enum": [
"json-array",
"ndjson-lf"
]
},
"maxUtf8Bytes": {
"type": "integer",
"minimum": 1,
"maximum": 100000
},
"maxItemsPerBatch": {
"type": "integer",
"minimum": 1,
"maximum": 500
},
"includeSha256": {
"default": false,
"type": "boolean"
}
},
"required": [
"records",
"framing",
"maxUtf8Bytes",
"maxItemsPerBatch"
],
"additionalProperties": false,
"$defs": {
"__schema0": {
"anyOf": [
{
"type": "string"
},
{
"type": "number"
},
{
"type": "boolean"
},
{
"type": "null"
},
{
"type": "array",
"items": {
"$ref": "#/$defs/__schema0"
}
},
{
"type": "object",
"propertyNames": {
"type": "string"
},
"additionalProperties": {
"$ref": "#/$defs/__schema0"
}
}
]
}
}
}
Complete output-envelope schema
{
"type": "object",
"required": [
"operation",
"version",
"result",
"provenance"
],
"properties": {
"operation": {
"const": "json-batch-encode",
"type": "string"
},
"version": {
"const": "0.29.0",
"type": "string"
},
"result": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"properties": {
"profile": {
"type": "string",
"const": "sorted-json-utf8-batches-v1"
},
"framing": {
"type": "string",
"enum": [
"json-array",
"ndjson-lf"
]
},
"batches": {
"maxItems": 500,
"type": "array",
"items": {
"type": "object",
"properties": {
"itemIndexes": {
"minItems": 1,
"maxItems": 500,
"type": "array",
"items": {
"type": "integer",
"minimum": 0,
"maximum": 499
}
},
"bodyText": {
"type": "string",
"maxLength": 100000
},
"utf8Bytes": {
"type": "integer",
"minimum": 1,
"maximum": 100000
},
"sha256": {
"type": "string",
"pattern": "^[0-9a-f]{64}$"
}
},
"required": [
"itemIndexes",
"bodyText",
"utf8Bytes"
],
"additionalProperties": false
}
},
"itemCount": {
"type": "integer",
"minimum": 0,
"maximum": 9007199254740991
},
"batchCount": {
"type": "integer",
"minimum": 0,
"maximum": 9007199254740991
},
"totalUtf8Bytes": {
"type": "integer",
"minimum": 0,
"maximum": 9007199254740991
},
"externalRequests": {
"type": "number",
"const": 0
},
"semanticValidityVerified": {
"type": "boolean",
"const": false
}
},
"required": [
"profile",
"framing",
"batches",
"itemCount",
"batchCount",
"totalUtf8Bytes",
"externalRequests",
"semanticValidityVerified"
],
"additionalProperties": false
},
"provenance": {
"type": "object",
"required": [
"inputSha256",
"outputSha256",
"deterministic",
"externalRequests"
],
"properties": {
"inputSha256": {
"type": "string",
"pattern": "^[a-f0-9]{64}$"
},
"outputSha256": {
"type": "string",
"pattern": "^[a-f0-9]{64}$"
},
"deterministic": {
"const": true
},
"externalRequests": {
"const": 0
}
}
}
},
"additionalProperties": false
}
Fixed example
One accepted fixed example, not a custom-input trial. No operation runs when this static page is requested.
Example input
{
"records": [
{
"x": "é"
},
{
"x": "a"
},
{
"x": "😀"
}
],
"framing": "json-array",
"maxUtf8Bytes": 23,
"maxItemsPerBatch": 100,
"includeSha256": true
}
Example response
{
"operation": "json-batch-encode",
"version": "0.29.0",
"result": {
"profile": "sorted-json-utf8-batches-v1",
"framing": "json-array",
"batches": [
{
"itemIndexes": [
0,
1
],
"bodyText": "[{\"x\":\"é\"},{\"x\":\"a\"}]",
"utf8Bytes": 22,
"sha256": "2806c29934df94f04cf761490e60e34550c4b905e5bce434c874377c74d5bd1f"
},
{
"itemIndexes": [
2
],
"bodyText": "[{\"x\":\"😀\"}]",
"utf8Bytes": 14,
"sha256": "62ec360b21da91f071c8ce7a2866d45c424c8f162eecb1dc504d8b32de7a0cc7"
}
],
"itemCount": 3,
"batchCount": 2,
"totalUtf8Bytes": 36,
"externalRequests": 0,
"semanticValidityVerified": false
},
"provenance": {
"inputSha256": "d9cc3efaf7a499898a72fd490b169cb52507707b5cd1a1651b4dd9d21a06139d",
"outputSha256": "aef8b58f28ceab34c9424ba2b58eeecb3b82d2d92d1319868c84336f3aceaedd",
"deterministic": true,
"externalRequests": 0
}
}
Bounds and precision
JavaScript IEEE-754 numbers; use strings for large integer IDs/exact decimals where the schema accepts strings. No lossless numeric parsing.
{
"global": {
"requestBytes": 131072,
"responseBytes": 524288,
"jsonDepth": 32,
"jsonNodes": 20000,
"requestsPerMinute": 60,
"paidAttemptsPerMinute": 20,
"idempotencyHours": 24
},
"operation": {
"inputBytes": 100000,
"outputBytes": 400000,
"jsonNodes": 12000,
"depth": 20,
"maxRecords": 500,
"maxUtf8Bytes": 100000,
"maxItemsPerBatch": 500,
"maxBatches": 500,
"serialization": "recursive sorted-key JSON.stringify; integer-index keys first numerically",
"ndjsonFinalLf": "always on nonempty batches"
}
}
Complete schemas, descriptions and cross-field validation may impose additional limits.
Proposed price and protocol definitions
{
"unit": "one successful operation call",
"proposedNominalUsd": "0.003",
"sixDecimalTokenBaseUnits": "3000",
"subscription": false,
"includesPayerWalletOrNetworkFees": false,
"liveQuoteVerified": false,
"condition": "Actual SDK challenge is authoritative only within the caller's explicit authorization; configured six-decimal token peg is an operator assertion, not a conversion guarantee."
}
Protocol definitions: x402, mpp. MPP uses Tempo charge. Paid MCP execution is unsupported. All runtime readiness is not evaluated in this build.
API path templates, not endpoints on this documentation host
{
"x402": "/v1/x402/json-batch-encode",
"mpp": "/v1/mpp/json-batch-encode"
}
Required headers
{
"Content-Type": "application/json",
"Idempotency-Key": "random 16–128 character operation identifier"
}
Actual SDK challenge amount, asset, network, recipient and wallet costs must pass independent authorization. Preserve identical key, body, protocol and credential on retries; on PAYMENT_UNCERTAIN stop and reconcile.
Execution profile and provider conditions
{
"deterministic": true,
"externalRequests": 0,
"maxExternalRequests": 0,
"resultSnapshotPersisted": false,
"fixedExampleIsIllustrativeSnapshot": false,
"requiresPayment": true,
"supportsMcpExecution": false
}
Deterministic supplied-input operation with no external requests or stored request/result bodies. Payment infrastructure retains payment metadata and hashes.
Failure handling
- HTTP 400: Malformed JSON, missing/invalid idempotency key, or payment identifier mismatch Correct the request before payment
- HTTP 402: Payment challenge or rejected payment Use official protocol SDK; inspect payment outcome before another payment
- HTTP 409: Idempotency conflict, duplicate proof, or PAYMENT_UNCERTAIN Keep original key, body, and proof; reconcile uncertainty with operator; never blindly repay
- HTTP 413: Input or generated output too large Reduce input; no payment attempted for validation failure
- HTTP 415: Unsupported media type or compression Send uncompressed application/json
- HTTP 422: Schema or service-specific semantic validation failure Correct input using returned error code; no payment attempted
- HTTP 429: Request/payment-attempt rate exceeded Wait for rate limit window; preserve existing payment identity
- HTTP 503: Payment configuration/provider/state unavailable, or live DNS preparation failed before settlement Check readiness; DNS preparation failures may retry the identical key/body/credential only; uncertainty requires reconciliation
Declared requirements
Before any paid call, refresh the live operation contract and POST the complete bounded budgeted plan to the separate API's /preflight. Unknown requirements block selection; compatible preflight is not permission to spend.