What is the difference between JSON and YAML?

JSON uses braces {} and brackets [] with strict quotation requirements, while YAML uses indentation for structure. YAML is more human-readable and supports comments, making it preferred for configuration files. JSON is better for data interchange between applications due to its strict format.

Is this JSON to YAML converter free?

Yes, our JSON to YAML converter is completely free with no usage limits. There's no signup required, and your data is processed entirely in your browser without being sent to any server.

Can I convert YAML back to JSON?

Yes! Use our YAML to JSON converter at /yaml-to-json for reverse conversion. Both tools work instantly in your browser.

Does the converter preserve data types?

Yes, our converter accurately preserves all JSON data types including strings, numbers, booleans, null values, nested objects, and arrays in the YAML output.

Can I use this for OpenAPI/Swagger files?

Absolutely. Our converter handles OpenAPI 3.0 and Swagger 2.0 specification files, properly converting the entire API definition structure to YAML format.

Is my data secure when using this converter?

Yes. All conversion happens locally in your browser using JavaScript. Your JSON data is never sent to any server or stored anywhere. Your data remains completely private.

What if my JSON has errors?

The converter validates your JSON before conversion. You'll see a clear error message identifying the problem, such as missing commas, unmatched brackets, or invalid characters.

Can I convert large JSON files?

Yes. The converter runs in your browser and can handle files as large as your browser's memory allows. For extremely large files, consider using command-line tools like yq or jq.

Does the output preserve key order?

Yes. The converter maintains the same key order from your original JSON. Keys appear in the YAML output in the same sequence you provided them.

What indentation does the YAML output use?

The default output uses 2-space indentation, which is the most common YAML style. You can change this to 4 spaces if your project requires it.

Stages · Jobs · Pipelines

GitLab CI JSON to YAML
Converter

Convert JSON into a .gitlab-ci.yml pipeline in seconds. Ideal for turning generated or templated CI definitions into the YAML GitLab expects. Free, instant, and fully browser-based.

JSON

YAML

How to Convert JSON to GitLab CI YAML

Paste your pipeline JSON

Drop in the JSON describing your stages, jobs, and their scripts.

Get .gitlab-ci.yml

Valid GitLab CI YAML appears instantly, with each job rendered as a top-level mapping.

Commit to your repo

Copy or download the file, save it as .gitlab-ci.yml at the repo root, and push to trigger the pipeline.

Why GitLab CI Uses YAML

GitLab CI/CD pipelines are configured through a single YAML file, .gitlab-ci.yml, at the root of your repository. GitLab reads this file to determine the stages, jobs, scripts, and rules for every pipeline run.

When pipeline definitions are produced by templates or generators, the intermediate format is often JSON. Converting it to YAML yields a file GitLab can parse directly, with no manual reformatting.

Benefits for GitLab Pipelines

Pipeline-Ready

Output is valid .gitlab-ci.yml syntax. Commit it to your repo root and the next push runs the pipeline.

Clear Job Diffs

Stage and script changes are easy to review in YAML, keeping CI updates transparent in merge requests.

Comment Your Config

Document why a job uses a rule or a specific runner tag. YAML supports # comments; JSON does not.

Private Processing

Pipelines reference variables and tokens. Conversion is local to your browser, so nothing sensitive is uploaded.

Frequently Asked Questions

Will the output run as a GitLab pipeline?

Yes, as long as your JSON matches GitLab CI structure (jobs with scripts, optional stages). Save the YAML as .gitlab-ci.yml at the repo root and GitLab will run it.

How are job scripts handled?

A script can be a single command or an array of commands. Both convert correctly — an array becomes a YAML list of commands, exactly what GitLab expects.

Are rules and only/except preserved?

Yes. Whether your jobs use the modern rules syntax or the legacy only/except keywords, the structure converts verbatim into valid YAML.

Why are some values quoted?

YAML quotes values that could be misinterpreted, such as a version number or a string starting with a special character. GitLab interprets quoted values correctly.

Is my pipeline configuration private?

Completely. Everything runs in your browser. Job definitions and variable values in your JSON never leave your computer.

Related Tools & Resources

JSON to YAML Converter
General-purpose JSON to YAML conversion.
YAML to JSON Converter
Reverse the conversion back to JSON.
All Converters
Browse every JSON-to-YAML use case.
GitLab CI YAML Reference
Official documentation.

GitLab CI JSON to YAMLConverter