Python Dict to JSON Converter

About this tool

Python's print() and repr() produce a dict/list literal, not JSON — so pasting it straight into a JSON parser fails. The syntaxes look alike but differ in ways a strict JSON reader rejects: Python writes True / False / None where JSON writes true / false / null, prefers 'single quotes', allows trailing commas, tuples (1, 2) and sets {1, 2}, # comments, and integer literals like 0xff or 1_000. This tool parses the Python literal and re-emits clean, valid JSON.

Everything runs locally in your browser via WebAssembly — nothing you paste leaves your machine.

Worked example

Input (a Python dict as printed by print(user)):

{'name': 'Ann', 'active': True, 'scores': (9, 8, 10), 'city': None}

Output (indent = 2 spaces):

{
  "name": "Ann",
  "active": true,
  "scores": [
    9,
    8,
    10
  ],
  "city": null
}

True became true, None became null, the single quotes became double quotes, and the tuple (9, 8, 10) became a JSON array.

What it converts

• True / False / None → true / false / null
• single-quoted, triple-quoted ('''…'''), raw (r'…'), bytes (b'…'), and f'…' / u'…' string prefixes → double-quoted JSON strings
• tuples (1, 2) and sets {1, 2} → JSON arrays (a set's uniqueness/order is not preserved beyond input order)
• trailing commas and # line comments → removed
• 0xff, 0o17, 0b101, and digit separators like 1_000_000 → decimal numbers
• non-string dict keys (1, True, None) → stringified JSON keys ("1", "true", "null"), matching json.dumps

Options

• Indentation — 2 or 4 spaces, tabs, or minified (single line).
• Sort keys alphabetically — like json.dumps(obj, sort_keys=True).
• Escape non-ASCII — emit \uXXXX escapes (Python's json.dumps default); off keeps readable UTF-8.

Limits

• Input is capped at 2 MB and nesting at 200 levels.
• This converts data literals only. Python expressions and constructor calls — datetime(2020, 1, 1), Decimal('1.5'), set(), custom class instances, ... (Ellipsis) — are not literals and will error. Reduce them to plain dict/list/str/number/bool/None values first.
• Complex numbers (3j) have no JSON equivalent and are rejected.

FAQ