{"id":9053,"library":"json2xml","title":"JSON to XML Converter","description":"json2xml is a simple and efficient Python library designed to convert JSON data into XML format. Currently at version 6.0.6, it is actively maintained with a focus on performance, notably through an optional native Rust extension. Its release cadence is regular, addressing bugs, adding features, and enhancing performance.","status":"active","version":"6.0.6","language":"en","source_language":"en","source_url":"https://github.com/vinitkumar/json2xml","tags":["json","xml","conversion","data-transformation","utility","performance"],"install":[{"cmd":"pip install json2xml","lang":"bash","label":"Base installation"},{"cmd":"pip install json2xml[fast]","lang":"bash","label":"With native Rust acceleration (recommended)"}],"dependencies":[{"reason":"Provides a native Rust extension for significantly faster JSON to XML conversion (up to 149x). Automatically installed with 'json2xml[fast]'.","package":"json2xml-rs","optional":true}],"imports":[{"symbol":"json2xml","correct":"from json2xml import json2xml"},{"note":"Useful for converting JSON strings directly.","symbol":"readfromstring","correct":"from json2xml.utils import readfromstring"},{"note":"For reading JSON data from a local file.","symbol":"readfromjson","correct":"from json2xml.utils import readfromjson"},{"note":"For fetching JSON data from a URL.","symbol":"readfromurl","correct":"from json2xml.utils import readfromurl"}],"quickstart":{"code":"from json2xml import json2xml\nfrom json2xml.utils import readfromstring\n\njson_data_string = '{\"items\": [{\"id\": 1, \"name\": \"Item A\"}, {\"id\": 2, \"name\": \"Item B\"}]}'\ndata = readfromstring(json_data_string)\n\n# Convert JSON to XML with default wrapper 'all' and pretty printing\nxml_output = json2xml.Json2xml(data, wrapper=\"items\", pretty=True).to_xml()\nprint(xml_output)\n\n# Example with the fast Rust backend (if installed via pip install json2xml[fast])\n# from json2xml.dicttoxml_fast import dicttoxml_fast\n# xml_output_fast = dicttoxml_fast(data, wrapper=\"items\", pretty=True)\n# print(xml_output_fast)","lang":"python","description":"This quickstart demonstrates converting a JSON string to XML using the `json2xml` class and the `readfromstring` utility. It also shows how to specify a custom root wrapper and enable pretty printing. The library automatically uses the faster Rust backend if `json2xml[fast]` was installed."},"warnings":[{"fix":"Use `pip install json2xml[fast]` for installation. The library automatically leverages the Rust backend if available.","message":"For optimal performance, especially with large JSON payloads, install `json2xml` with the `[fast]` extra. Without it, the pure Python implementation will be used, which can be significantly slower (up to 149x).","severity":"gotcha","affected_versions":"<6.0.0 (where Rust backend was introduced), or any version installed without `[fast]`"},{"fix":"Upgrade to version 6.0.5 or newer: `pip install --upgrade json2xml`.","message":"Double-escaping of XML attribute values occurred in versions prior to v6.0.5, leading to malformed XML output for certain key names.","severity":"gotcha","affected_versions":"<6.0.5"},{"fix":"Be aware of this behavioral difference for extreme integer values. It's a design choice to ensure compatibility without breaking the conversion.","message":"When using the Rust backend (via `[fast]` installation), very large integers (exceeding Rust's `i64` range) will be represented as strings in the XML output to prevent `OverflowError`.","severity":"gotcha","affected_versions":">=6.0.0 (Rust backend)"},{"fix":"Ensure your input JSON is valid before passing it to `json2xml`. Use a JSON linter or validator for complex structures.","message":"The library expects well-formed JSON input. Providing invalid or malformed JSON can lead to conversion errors or unexpected XML output.","severity":"gotcha","affected_versions":"All versions"}],"env_vars":null,"last_verified":"2026-04-16T00:00:00.000Z","next_check":"2026-07-15T00:00:00.000Z","problems":[{"fix":"Run `pip install json2xml` (or `pip install json2xml[fast]`) in your terminal. If using a virtual environment, ensure it's activated.","cause":"The `json2xml` library is not installed in the current Python environment or the environment is not active.","error":"ModuleNotFoundError: No module named 'json2xml'"},{"fix":"Validate your input JSON for correctness. Upgrade `json2xml` to the latest version to benefit from bug fixes (e.g., attribute escaping in v6.0.5). Review `json2xml` parameters like `wrapper`, `pretty`, and `attr_type`.","cause":"The generated XML is syntactically incorrect, often due to issues like invalid JSON input, special characters not being properly escaped (in older versions), or improper handling of data types.","error":"XML Parsing Error: not well-formed"},{"fix":"Upgrade to the latest `json2xml` version. Consider pre-processing your JSON to handle `null` values explicitly (e.g., remove keys with `null` values or replace `null` with empty strings) if issues persist.","cause":"Older versions or specific configurations might struggle to represent `null` JSON values gracefully in XML, leading to conversion issues.","error":"Error converting JSON with null values"},{"fix":"Rename your Python script file to something different (e.g., `my_converter.py`) to avoid shadowing the library import.","cause":"This can occur if the Python script file you are running has the same name as the library (e.g., `json2xml.py`), causing a conflict with the installed package.","error":"Importing json2xml library gives invalid syntax error"}]}