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JSON Report Generation UBL 2.1 Compliance Readable JSON XAdES Signature Check SaaS Licensing Bulk Email Validation Schema.org Detection Repair E-Invoice Validator LLM Syntax Malformed Marketing Optimization Key Sharing Prevention Error Reporting ChatGPT Microdata Validator Role-based Address Check Schema Markup Validation Software Licensing

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Best json-ld validation APIs

Universal JSON Fix

Tools & Utilities

Universal JSON Fix repairs broken or malformed JSON, especially from LLMs like ChatGPT, Claude, Deepseek, Gemini, or Llama. This API ensures reliable parsing by fixing mixed quotes, missing commas, and formatting issues, making it ideal for AI applications.

Free 7-Day Trial

100% uptime 13ms avg MCP ready

Schema Markup Validator API

Data & Analytics

Validate structured data markup on any web page including JSON-LD, Microdata, and RDFa. Detects Schema.org types, checks for errors, and returns detailed validation results.

Free 7-Day Trial

100% uptime 223ms avg MCP ready

Structured Data Markup Validator API

Data & Analytics

Extracts and validates JSON-LD, Microdata, RDFa, and structured markup from webpages or raw HTML for SEO and technical validation.

Free 7-Day Trial

100% uptime 1,874ms avg MCP ready

Malaysia MyInvois E-Invoice Validator API

Legal & Compliance

Keyless Malaysia MyInvois (LHDN) e-invoice validator: official UBL 2.1 XSD, code lists, totals math, XAdES signature check. POST XML or JSON, get a rule-coded JSON report. No LHDN account.

Free 7-Day Trial

100% uptime 410ms avg MCP ready

JSON Clean API

Tools & Utilities

JSON Clean API converts JSON documents into a readable format with line breaks and indentations. It supports entries up to 200,000 characters.

Free 7-Day Trial

100% uptime 1,341ms avg MCP ready

License Key Validation License Verification and Activation API

Security & Cybersecurity

Validate license keys quickly with our License Key Validation API for enhanced software security and user control.

Free 7-Day Trial

100% uptime 294ms avg MCP ready

Digital Product Security License Verification and Activation API

Security & Cybersecurity

Safeguard digital products with our Digital Product Security API for robust license verification and activation.

Free 7-Day Trial

100% uptime 314ms avg MCP ready

Email Validation and Bulk CSV Verification API

Communication & Messaging

Fast, real-time email verification and bulk CSV cleaner. Checks RFC syntax, DNS and MX records, over 150 disposable domains, role accounts, and domain typos in 15ms.

Free 7-Day Trial