main.py
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Examples
6
BudiBadu
Online Python simplejson Compiler
simplejson is a fast, complete, and extensible JSON encoder/decoder for Python. It powers the standard json module and ships with an optional C extension for major speed boosts, while remaining pure-Python compatible with every runtime that Pyodide exposes. The library provides precise control over serialization through hooks like default, for_json, use_decimal, and formatting flags for pretty printing, canonical ordering, and NaN handling.
This compiler lets you inspect payloads, build custom encoders, and test parser settings directly in your browser. Round-trip complex objects, convert Decimals without losing precision, coerce tuples and lists, and extend JSONEncoder or JSONDecoder to satisfy strict API contracts. Every option from the upstream package—object_hook, object_pairs_hook, parse_float, parse_int, and more—is available here so you can validate serialization logic end to end. You can also upload and use files or folders directly in your code for JSON processing and data workflows. This compiler is online and completely free to use.
The included examples highlight practical techniques: serializing custom dataclasses, preserving Decimal precision, enforcing stable key order, turning ISO strings into datetime objects, filtering data before encoding, and creating light-weight helper utilities. These workflows are common in JSON APIs, config management, IoT telemetry, and automation scripts that demand predictable serialization.
Who Should Use This
- Backend engineers shaping JSON APIs or RPC payloads
- Data engineers who need high-performance JSON parsing
- Automation scripts that normalize third-party payloads
- Developers requiring Decimal-safe serialization for finance
- Teams extending JSONEncoder/Decoder with custom hooks
- Students exploring how Python’s JSON stack works internally
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