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Examples
6

Online Python orjson Compiler

orjson is a fast, correct JSON library for Python that benchmarks as the fastest Python library for JSON serialization and deserialization. It is more correct than the standard json library or other third-party libraries, with strict compliance to UTF-8 and RFC 8259. orjson natively serializes dataclass, datetime, numpy, and UUID instances, making it ideal for high-performance JSON processing in Python applications where speed and correctness are critical.

This compiler includes orjson 3.11+ with full support for fast JSON serialization and deserialization, powered by Pyodide WebAssembly technology. orjson.dumps() is approximately 10x faster than the standard json library and serializes common types and subtypes natively. orjson.loads() is approximately 2x faster than json and is strictly compliant with UTF-8 and RFC 8259. Whether you're building high-performance APIs, processing large JSON datasets, serializing dataclasses and numpy arrays, or working with datetime objects, our orjson playground offers instant execution with comprehensive JSON processing capabilities. You can serialize and deserialize JSON data, work with dataclasses and custom types, handle datetime objects, and use various serialization options. You can also upload and use files or folders directly in your code for JSON processing workflows. This compiler is online and completely free to use.

Our example collection covers essential orjson topics including basic serialization and deserialization, working with dataclasses and datetime objects, numpy array serialization, custom serialization options, and performance comparisons. You'll learn how to use orjson for fast JSON processing, serialize complex Python objects, and optimize JSON operations in your applications.

Who Should Use This

  • Backend developers building high-performance APIs and web services
  • Data engineers processing large JSON datasets efficiently
  • Developers working with dataclasses, datetime, and numpy in JSON workflows
  • Performance-conscious developers needing faster JSON serialization
  • Full-stack developers optimizing JSON processing in Python applications
  • Students learning fast JSON processing and serialization techniques

Part of the BudiBadu Ecosystem

Specialized Online Python compiler powered by Pyodide WebAssembly. Run Python Library directly in your browser with zero setup.

Pyodide
WebAssembly
Monaco Editor
Python 3.13