literalizer 2026.4.18

Convert JSON data structures to native language literal syntax.

literalizer

literalizer converts JSON, JSON5, YAML, and TOML data structures to native language literal syntax.

• Supported languages

• Installation

• Usage

• Use cases

• CLI

• Full documentation

Supported languages

Ada, Bash, C, C#, C++, Clojure, COBOL, Common Lisp, Crystal, D, Dart, Dhall, Elixir, Elm, Erlang, F#, Fortran, Gleam, Go, Groovy, Haskell, HCL, Java, JavaScript, JSON5, Jsonnet, Julia, Kotlin, Lua, MATLAB, Mojo, Nim, Norg, Objective-C, OCaml, Occam-pi, Odin, Perl, PHP, PowerShell, PureScript, Python, R, Racket, Raku, Ruby, Rust, Scala, Scheme, Swift, SystemVerilog, TOML, TypeScript, Visual Basic, YAML, Zig.

Installation

Requires Python 3.12+.

pip install literalizer

Usage

"""Example of using literalizer."""

from literalizer import InputFormat, literalize
from literalizer.languages import Go

# YAML comments are preserved using the target language's comment syntax
yaml_config = """\
# Server configuration
host: localhost  # default host
port: 8080
# Enable debug mode for development
debug: true
"""
result = literalize(
    source=yaml_config,
    input_format=InputFormat.YAML,
    error_on_coercion=False,
    language=Go(
        date_format=Go.date_formats.GO,
        datetime_format=Go.datetime_formats.GO,
        bytes_format=Go.bytes_formats.HEX,
        sequence_format=Go.sequence_formats.SLICE,
    ),
    pre_indent_level=0,
    include_delimiters=True,
    variable_form=None,
)
# result:
# map[string]any{
#     // Server configuration
#     "host": "localhost",  // default host
#     "port": 8080,
#     // Enable debug mode for development
#     "debug": true,
# }

Use cases

• Generate test fixtures from JSON, JSON5, YAML, or TOML samples.

• Generate multi-language request/response examples for API docs (see guide).

• Generate multi-language function call examples from data (see guide).

• Create type-safe literal data from JSON, JSON5, YAML, or TOML config files.

CLI

A command-line interface is available at literalizer-cli.

Full documentation

See the full documentation for more information including how to contribute.