PIPELINE Encoding & Decoding Intermediate 3 steps

Decode nested URL parameter (Base64 JSON)

APIs often transport structured data through query parameters with layered encoding. This chain reverses the layers in order: percent-decoding first, then Base64, then JSON formatting. Each intermediate output is visible, so a failure points at the exact layer.

What it solves

Unwrap a URL parameter that carries URL-encoded Base64 JSON into readable, formatted JSON.

Input → Output

URL Decoder input → JSON Formatter output across 3 steps.

Runs in

1–2 minutes · fully local in your browser.

Before you start

A URL parameter value with layered encoding (percent → Base64 → JSON)

The pipeline

1 URL Decoder url-decode

Decode percent-encoded URL text back to readable characters. Free, private, and 100% client-side.
2 Base64 Decoder base64-decode

Decode Base64 data back to readable text online. Free, private, and 100% client-side.
3 JSON Formatter json-format

Format, minify, or sort JSON online. Free, private, and 100% client-side.

Open in Toolchain

Runs locally in your browser. The recipe defines the pipeline only — your input never leaves this tab.

▶Run this workflow

Enter your input below and click Run. All processing happens locally in your browser — nothing is uploaded.

Input data

Pipeline progress

URL Decoderurl-decode
Base64 Decoderbase64-decode
JSON Formatterjson-format

Sample input

eyJhIjoxfQ%3D%3D

Expected output

{
  "a": 1
}

This pair is executed against the real tools at build time (tests/unit/recipes.test.ts) — the expected output is verified, not illustrative.

Related tasks

Decode nested URL-encoded parameters (Base64 JSON in a query string)

Unwrap the common API pattern where a URL parameter carries URL-encoded Base64 JSON — one chain, three tools, zero copy-pasting between pages.

Related workflows

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.

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Learn more

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Tools used

Decode percent-encoded URL text back to readable characters. Free, private, and 100% client-side.

Decode Base64 data back to readable text online. Free, private, and 100% client-side.

Format, minify, or sort JSON online. Free, private, and 100% client-side.