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About

This tool is a specialized JSON Configuration Interpolator designed to resolve "obfuscated" placeholders within configuration files, following the logic of libraries like Clarity. In modern DevOps and secure development workflows, sensitive data (like passwords or API keys) is often replaced with placeholders in source control to prevent leaks.

The decoder applies a substitution algorithm to merge a Template (containing placeholders like **DB_PASS|default**) with a Source (an environment JSON object). It parses the logic defined by the Key and optional Default value to generate the final, production-ready configuration.

json config decoder developer-tools devops

Formulas

The decoding logic follows a strict precedence rule for every string value S found in the JSON structure:

Vfinal =
{
E[k] if E[k] NULLd if d EXISTSS otherwise

Where E is the Environment object, k is the extracted key, and d is the default value extracted from the syntax **k|d**.

Reference Data

Placeholder SyntaxDescriptionLogic
**KEY**Strict replacementReturns Env[KEY]
**KEY|default**Default fallbackReturns Env[KEY] default
**a.b.c**Nested AccessTraverses Env object depth
**MISSING**UnresolvedReturns original string (if no default)

Frequently Asked Questions

The tool looks for strings wrapping a key in double asterisks, such as **API_KEY**. You can optionally provide a default value by separating it with a pipe character, e.g., **API_KEY|1234**. If the key is found in your Environment JSON, it replaces the placeholder. If not, it uses the default.
Yes. You can use dot notation within the placeholder. For example, **database.auth.password** will traverse the Environment object to find the nested value.
Yes. This tool runs 100% in your browser using JavaScript. No data (templates or secrets) is ever sent to a server. You can safely paste environment variables here for testing.
If a key is not found in the Environment JSON and no default value is provided (e.g., just **MISSING_KEY**), the tool will leave the original placeholder string as-is in the output.