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.

Scrape Configs · Rules · Alerts

Prometheus JSON to YAML
Converter

Convert JSON into a prometheus.yml configuration in seconds. Ideal for turning generated scrape and rule config into the YAML Prometheus expects. Free, instant, and browser-based.

JSON

YAML

How to Convert JSON to Prometheus YAML

Paste your config JSON

Drop in the JSON describing your global settings, scrape_configs, and rule files.

Get prometheus.yml

Valid Prometheus YAML appears instantly, with scrape jobs correctly structured.

Use with Prometheus

Copy or download as prometheus.yml and start Prometheus with --config.file.

Why Prometheus Uses YAML

Prometheus is configured through prometheus.yml, which defines global settings, scrape targets, and rule files in YAML.

Monitoring configs are often generated dynamically as JSON — from service discovery or templating tools. Converting to YAML produces a config file Prometheus can load directly.

Benefits for Monitoring Workflows

Config-Ready

Output is valid prometheus.yml you can load with --config.file, with scrape jobs intact.

Readable Targets

Scrape configs and relabeling rules are far clearer in YAML than in nested JSON.

Comment Your Config

Explain why a job uses a specific interval or relabel rule. YAML supports # comments; JSON does not.

Private Processing

Configs reference internal endpoints and tokens. Conversion is local to your browser, so nothing is uploaded.

Frequently Asked Questions

Will the YAML work as a Prometheus config?

Yes, provided your JSON matches Prometheus structure (global, scrape_configs, rule_files). Save it as prometheus.yml and load it with --config.file.

Are scrape_configs preserved?

Yes. Each scrape job, including static_configs and relabel_configs, converts exactly into the YAML Prometheus expects.

How are durations handled?

Duration strings like 15s or 1m are kept as strings, which is what Prometheus requires for interval and timeout fields.

Why are some values quoted?

YAML quotes values that could be misread, such as regex patterns in relabeling. Prometheus interprets the quoted values correctly.

Is my monitoring config private?

Completely. Conversion runs in your browser, so internal endpoints and tokens never leave your machine.

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.
Prometheus Configuration Documentation
Official documentation.

Prometheus JSON to YAMLConverter