Developer Utilities Tier 3 Ready POST /v1/semver-lockfile-judge

Package.json & Dependency Upgrade Risk Judge API — Flag Breaking SemVer Bumps

Diff two package.json files to flag breaking SemVer bumps and risky dependency changes. Compare two package.json manifests or dependency maps to flag major breaking upgrades, 0.x instability, prerelease tags, git/tarball URLs, and supply-chain risks.

Try It Live in Your Browser · No API Key Required

1. Interactive Sandbox & Sample JSON Output

200 OK · Ready

Editable Request JSON (`POST /v1/semver-lockfile-judge`)

Live 200 OK Response Envelope

{
  "ok": true,
  "data": {
    "verdict": "block",
    "risk_score": 64,
    "breaking_count": 0,
    "summary": {
      "total_changes": 3,
      "major_breaking": 0,
      "zero_ver_breaking": 0,
      "downgrades": 0,
      "unpinned_or_vcs": 1,
      "added": 0,
      "removed": 0,
      "minor_or_patch": 1
    },
    "changes": [
      {
        "package": "hono",
        "section": "dependencies",
        "before_spec": "^4.6.0",
        "after_spec": "^4.7.1",
        "change_type": "minor_upgrade",
        "risk": "low",
        "explanation": "Backward-compatible minor upgrade for hono: ^4.6.0 -> ^4.7.1."
      },
      {
        "package": "left-pad",
        "section": "dependencies",
        "before_spec": null,
        "after_spec": "github:user/repo",
        "change_type": "unpinned_or_vcs",
        "risk": "critical",
        "explanation": "Added left-pad@github:user/repo with unpinned tag, wildcard, or VCS URL."
      },
      {
        "package": "zod",
        "section": "dependencies",
        "before_spec": "^3.23.8",
        "after_spec": "^4.0.0-beta.1",
        "change_type": "prerelease_introduced",
        "risk": "high",
        "explanation": "Switched zod from stable (^3.23.8) to pre-release (^4.0.0-beta.1)."
      }
    ],
    "recommendations": [
      "Pin wildcard (*, latest) and VCS dependencies to exact SemVer ranges or commit SHAs."
    ]
  },
  "meta": {
    "request_id": "req_slj_01",
    "ms": 1
  }
}

Get API Key on RapidAPI Get API Key on Zyla Hub Download OpenAPI 3.0.3 Spec

2. Quickstart Code Examples

Full TypeScript & Python SDK →

curl -X POST "https://api.tinplate.dev/v1/semver-lockfile-judge" \
  -H "Content-Type: application/json" \
  -H "X-RapidAPI-Key: YOUR_RAPIDAPI_KEY" \
  -d '{"before":{"dependencies":{"zod":"^3.23.8","hono":"^4.6.0"}},"after":{"dependencies":{"zod":"^4.0.0-beta.1","hono":"^4.7.1","left-pad":"github:user/repo"}}}'

import { TinplateClient } from "@tinplate/sdk"; // npm install @tinplate/sdk

const tinplate = new TinplateClient({
  rapidApiKey: process.env.RAPIDAPI_KEY!,
});

const { data, meta } = await tinplate.call("/v1/semver-lockfile-judge", {
  "before": {
    "dependencies": {
      "zod": "^3.23.8",
      "hono": "^4.6.0"
    }
  },
  "after": {
    "dependencies": {
      "zod": "^4.0.0-beta.1",
      "hono": "^4.7.1",
      "left-pad": "github:user/repo"
    }
  }
});
console.log(`[${meta.ms} ms]`, data);

import requests

response = requests.post(
    "https://api.tinplate.dev/v1/semver-lockfile-judge",
    headers={
        "Content-Type": "application/json",
        "X-RapidAPI-Key": "YOUR_RAPIDAPI_KEY",
    },
    json={
  "before": {
    "dependencies": {
      "zod": "^3.23.8",
      "hono": "^4.6.0"
    }
  },
  "after": {
    "dependencies": {
      "zod": "^4.0.0-beta.1",
      "hono": "^4.7.1",
      "left-pad": "github:user/repo"
    }
  }
}
)
print(response.json())

const response = await fetch("https://api.tinplate.dev/v1/semver-lockfile-judge", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "X-RapidAPI-Key": "YOUR_RAPIDAPI_KEY",
  },
  body: JSON.stringify({
  "before": {
    "dependencies": {
      "zod": "^3.23.8",
      "hono": "^4.6.0"
    }
  },
  "after": {
    "dependencies": {
      "zod": "^4.0.0-beta.1",
      "hono": "^4.7.1",
      "left-pad": "github:user/repo"
    }
  }
}),
});
const result = await response.json();
console.log(result);

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "tinplate_semver_lockfile_judge",
    "arguments": {
      "before": {
        "dependencies": {
          "zod": "^3.23.8",
          "hono": "^4.6.0"
        }
      },
      "after": {
        "dependencies": {
          "zod": "^4.0.0-beta.1",
          "hono": "^4.7.1",
          "left-pad": "github:user/repo"
        }
      }
    }
  }
}

OpenAPI 3.0.3 Schema Contract

Request Parameters & Response Schema Reference

Request Body Parameters (`POST /v1/semver-lockfile-judge`)

Parameter	Type & Constraints	Description
`before`required	`string \| object`	Field 'before'
`after`required	`string \| object`	Field 'after'
`include_dev_dependencies`optional	`boolean` default: true	Field 'include_dev_dependencies'
`fail_on_zero_ver_minor`optional	`boolean` default: true	Field 'fail_on_zero_ver_minor'

Response `data` Object Fields (`200 OK`)

Field	Type	Description
`verdict`	`"allow" \| "review" \| "block"`	Field 'verdict'
`risk_score`	`integer`	Field 'risk_score'
`breaking_count`	`integer`	Field 'breaking_count'
`summary`	`object`	Field 'summary'
`changes`	`object[]`	Field 'changes'
`recommendations`	`string[]`	Field 'recommendations'

3. What SemVer & Package Manifest / Lockfile Diff Judge API Detects & Validates

Parses SemVer ranges (^, ~, >=, *, workspace:, exact versions) and compares before vs after dependency maps
Flags major version bumps, 0.x.y minor breaking bumps, downgrades, and prerelease (-alpha, -beta, -rc) introductions
Supply-chain risk checks: flags unpinned git:// or github: URLs, HTTP tarball URLs, wildcard * versions, and lifecycle script additions (preinstall/postinstall)

Honest Engineering Boundaries

4. Known Limitations & Test Verification

Release Version: v1.0.7 · Last Verified / Benchmarked: 14 November 2026 · Latency Note: Sub-millisecond figures measure in-Worker V8 compute time (typical client HTTPS network RTT to the nearest Cloudflare PoP is 15–65 ms) · See Full Portfolio Benchmarks & Corpora →

Evaluates manifest version ranges and script changes deterministically; does not query the live npm registry or CVE databases.
Tested v1.0.4 (14 November 2026).

5. Marketplace Plans & Payload Quotas

Plan	Monthly Price	Included Requests	Rate Limit	Max Request Payload	Best For
BASIC	$0.00 / month	500 / month (hard limit)	10 req / min	64 KB	Evaluation, local development & CI smoke tests
PRO	$9.99 / month	15,000 / month	60 req / min	128 KB	Solo developers & production apps
ULTRA	$29.99 / month	100,000 / month	300 req / min	256 KB	Growing SaaS & multi-agent pipelines
MEGA	$79.99 / month	500,000 / month	1,000 req / min	256 KB	High-volume enterprise workloads

Subscribe on RapidAPI Subscribe on Zyla Hub Full Pricing Details

6. Frequently Asked Questions

Why are 0.x minor bumps flagged as potentially breaking?

Per SemVer 2.0.0 spec clause 4, initial development versions (0.y.z) treat minor bumps (e.g. 0.4.0 -> 0.5.0) as breaking changes.

Does it inspect package.json lifecycle scripts?

Yes, if a diff adds or modifies preinstall, install, or postinstall scripts, it raises a supply-chain review flag.

Can I use it to auto-approve Dependabot or Renovate PRs?

Yes—auto-merge when verdict is 'safe' (patch/minor bumps only, no new scripts or git URLs) and require human review on 'review' or 'high_risk'.

Zero Payload Logging

7. Data Handling, Privacy & Marketplace Proxy Disclosure

Stateless in-memory manifest diffing; zero retention.

Worker Zero-Logging Guarantee: Cloudflare Workers Observability and invocation logging are disabled in configuration (observability.enabled = false, head_sampling_rate = 0, invocation_logs = false). Payloads are processed strictly in volatile V8 memory and never logged or stored by Tinplate.

Marketplace Proxies vs. Direct Bearer Key: Requests sent via RapidAPI or Zyla API Hub pass through those marketplaces' proxy infrastructure (subject to their respective privacy policies). Security-sensitive workloads requiring end-to-end zero-intermediary processing can connect directly to https://api.tinplate.dev using a Direct Bearer Key (Authorization: Bearer <API_KEY>). Read our full Privacy Notice and OpenAPI 3.0.3 JSON Schema.