TASK
Migrate configuration between JSON and YAML
Convert a JSON config to YAML (or back) with a formatted intermediate step, and know the type-coercion pitfalls before you commit the file.
- 1 JSON YAML Converter →
For a quick one-way conversion, paste JSON and get YAML directly.
- 2 json-format → json-yaml
Recommended when the source JSON is minified: validate and pretty-print it first, inspect the structure, then convert.
- 3 yaml-convert
The reverse direction. Watch the JSON output for unquoted YAML scalars coerced to booleans or numbers.
- 4
Before committing the migration, review three known pitfalls: unquoted values that look numeric or boolean get coerced (quote version numbers and semver strings); YAML anchors and aliases (&ref / *ref) have no JSON equivalent and are expanded on conversion; duplicate keys are allowed by some YAML parsers and rejected by JSON — dedupe deliberately.
Frequently asked questions
- Is YAML a superset of JSON?
- YAML 1.2 is essentially a superset of JSON 1.2 syntax — most JSON parses as YAML. The reverse is not true: YAML features like anchors, multi-document streams, and unquoted scalars have no JSON representation.
- Why did my version number become a float?
- YAML parses unquoted 1.10 as the number 1.1. Quote version-like strings ('1.10') in YAML to keep them textual.
Workflows that solve this
Compare two YAML configs via JSON
Convert YAML configs to JSON for diff-friendly comparison of structured values. PIPELINE
Validate, format, then convert JSON to YAML
Convert a (possibly minified) JSON config to YAML, catching syntax errors at the first node instead of producing subtly wrong YAML. PIPELINE
Convert YAML to JSON
Turn a YAML document into JSON and inspect the parsed values for type coercion surprises. PIPELINE
Convert CSV to JSON then YAML
Transform spreadsheet CSV data into YAML via a JSON intermediate, suitable for config generation. PIPELINE
Encode a JSON payload for URL transport
Prepare a JSON document for a URL parameter: pretty-print, Base64-encode, then percent-encode — the exact inverse of the nested-parameter decode chain. PIPELINE
ENV to JSON to YAML
Convert .env to JSON then to YAML for deployment configs. PIPELINE
HJSON to JSON Format
Format HJSON then convert to standard JSON. PIPELINE
INI to JSON to YAML
Convert INI to JSON then to YAML for modern config format. PIPELINE
Format JSON and compute integrity checksum
Pretty-print a JSON document and compute a CRC32 checksum to detect any subsequent modifications. PIPELINE
Minify and validate JSON
Format JSON for inspection and validate it is syntactically correct in one pass. PIPELINE
Format JSON and generate TypeScript interface
Format a JSON document then infer a TypeScript interface definition in one chain. PIPELINE
Convert JSON to YAML then TOML
Migrate a JSON configuration through YAML into TOML for Rust or Python project configs. PIPELINE
JSON5 to JSON Format
Format JSON5 then convert to standard JSON. PIPELINE
JSONC to JSON Format
Format JSONC (JSON with comments) then convert to standard JSON. PIPELINE
Decode and format a JWT payload
Parse a JWT token, extract its payload, and format the JSON for inspection. PIPELINE
Properties to JSON to YAML
Convert Java properties to JSON then to YAML. PIPELINE
Parse Query String and Format JSON
Parse query string into key-value pairs then format as JSON. PIPELINE
Convert TOML to JSON
Parse a TOML configuration file into JSON for tools and APIs that expect JSON input. PIPELINE
Convert TOML to JSON then YAML
Transform a TOML config into YAML via JSON for Kubernetes or CI tooling. PIPELINE
Convert TOML to YAML via JSON
Transform a TOML configuration file into YAML format, using JSON as an intermediate representation. PIPELINE
Decode nested URL parameter (Base64 JSON)
Unwrap a URL parameter that carries URL-encoded Base64 JSON into readable, formatted JSON. PIPELINE
YAML to JSON to CSV
Convert YAML to JSON then to CSV for spreadsheet use. PIPELINE
Generate TypeScript interfaces from YAML
Convert a YAML document to TypeScript interface definitions, using JSON as an intermediate format. PIPELINE
Validate and format YAML
Convert YAML to JSON to validate its structure, then confirm the JSON is well-formed. PIPELINE
Learn more
Want to understand why?
How to Convert JSON to YAML
Convert JSON data to YAML format for more readable configuration files. TUTORIAL
JSON vs YAML for configuration: syntax, pitfalls, and how to choose
Where YAML buys you ergonomics, where it quietly coerces your data, why JSON stays the machine boundary, and a practical decision rule for config files. TUTORIAL
JSON
JSON (JavaScript Object Notation) is a lightweight data interchange format based on JavaScript object literals, using key-value pairs and arrays. GLOSSARY
YAML
YAML (YAML Ain't Markup Language) is a configuration-oriented data serialization format using indentation for hierarchy, supporting comments and references, and better suited to hand editing than JSON. GLOSSARY