dumps

Serialize ``obj`` to a JSON formatted ``str``.

If ``skipkeys`` is true then ``dict`` keys that are not basic types
(``str``, ``int``, ``float``, ``bool``, ``None``) will be skipped
instead of raising a ``TypeError``.

If ``ensure_ascii`` is false, then the return value can contain
non-ASCII and non-printable characters if they appear in strings
contained in ``obj``.  Otherwise, all such characters are escaped in
JSON strings.

If ``check_circular`` is false, then the circular reference check
for container types will be skipped and a circular reference will
result in an ``RecursionError`` (or worse).

If ``allow_nan`` is false, then it will be a ``ValueError`` to
serialize out of range ``float`` values (``nan``, ``inf``, ``-inf``) in
strict compliance of the JSON specification, instead of using the
JavaScript equivalents (``NaN``, ``Infinity``, ``-Infinity``).

If ``indent`` is a non-negative integer, then JSON array elements and
object members will be pretty-printed with that indent level. An indent
level of 0 will only insert newlines. ``None`` is the default and gives
a representation with no newlines inserted.

If specified, ``separators`` should be an ``(item_separator,
key_separator)`` tuple.  The default is ``(', ', ': ')`` if *indent* is
``None`` and ``(',', ': ')`` otherwise.  To get the most compact JSON
representation, you should specify ``(',', ':')`` to eliminate
whitespace.

``default(obj)`` is a function that should return a serializable version
of obj or raise TypeError. The default simply raises TypeError.

If *sort_keys* is true (default: ``False``), then the output of
dictionaries will be sorted by key.

To use a custom ``JSONEncoder`` subclass (e.g. one that overrides the
``.default()`` method to serialize additional types), specify it with
the ``cls`` kwarg; otherwise ``JSONEncoder`` is used.