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JsonGPT

JsonGPT is an innovative API designed to make it easier for developers to obtain structured JSON data from Large Language Models (LLMs). Acting as a mediator, JsonGPT integrates seamlessly with popula

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What is JsonGPT?

JsonGPT is an API that simplifies the process of getting structured JSON output from large language models. Instead of building custom parsing logic, developers send prompts to JsonGPT along with a schema definition, and the tool handles validation and formatting automatically. It works as a middleware layer between your application and LLM providers including OpenAI, Google Gemini, Meta Llama, Azure OpenAI, Groq, and Anthropic Claude. The tool also extracts JSON data from web pages and PDF documents, making it useful for data collection tasks beyond simple LLM interactions. Features like prompt caching help reduce API costs, whilst automatic retry mechanisms and fallback options improve reliability when requests fail.

Key features

Multi-provider support

works with OpenAI, Google Gemini, Meta Llama, Azure OpenAI, Groq, and Anthropic Claude

Schema validation

ensures LLM output conforms to your specified JSON structure

Prompt caching

reduces costs by caching repeated requests across API calls

JSON streaming

delivers results incrementally for faster perceived performance

Web and document extraction

pulls structured data from websites and PDF files

Automatic retry logic

includes fallback mechanisms to handle failed requests

Pros & cons

Advantages

  • Eliminates manual JSON parsing and validation work from your codebase
  • Works across multiple LLM providers, reducing vendor lock-in
  • Cost-efficient through prompt caching and request optimisation
  • Handles extraction from unstructured sources like web pages and PDFs

Limitations

  • Adds another API layer between your application and LLMs, increasing latency slightly
  • Dependency on a third-party service means potential downtime affects your data pipeline
  • Specific pricing details for paid tiers are not clearly documented publicly

Use cases

Extracting structured product data from e-commerce websites for price monitoring

Converting unstructured text documents into consistent JSON schemas for database storage

Building data pipelines that process PDFs and extract key information automatically

Generating structured API responses from multiple LLM providers without custom parsing

Creating web scraping tools that maintain data consistency across requests

Ready to try JsonGPT?

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Pricing

Free

Free

Basic access to JsonGPT API with rate limits; suitable for testing and small projects

Paid

Contact for details

Higher rate limits, priority support, and advanced features like prompt caching and streaming

Get started with JsonGPT

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Try JsonGPT free
  • Free plan available
  • No credit card