JSON Encoder & Decoder is unclaimed —

JSON Encoder & Decoder

Format, Validate & Escape·jsonencoderdecoder.xyz

JSON Encoder & Decoder is a browser-based tool that formats, validates, and encodes/decodes JSON. It leniently parses malformed JSON including unquoted keys, single-quoted strings, trailing commas, JS-style comments, and double-encoded strings, showing output in a Monaco editor with syntax highlighting. It can also double-encode a JSON document into a string for embedding inside another JSON payload. All processing happens client-side in the browser with no data sent to a server, and snippets can be saved locally via the browser's localStorage.

What it's for

Pretty-print and clean up malformed or JSON-like textValidate JSON and see parse errors with line/column positionDecode double-encoded JSON strings back to a documentEncode a JSON document into a double-encoded string for embedding in another JSON payloadSave and retrieve JSON snippets locally in the browser

Features 16

All processing done client-side, no server upload
Best-effort loose formatting when input can't be fully parsed
Clear input/output
Copy Result to clipboard
Encode a JSON document into a double-encoded JSON string
Handles double-encoded strings
Handles JavaScript-style comments
Handles single-quoted strings
Handles trailing commas
Handles unquoted keys
List, load, and delete saved snippets
Monaco editor output with syntax highlighting and code folding
Paste Input from clipboard
Pretty-print JSON with 2-space indentation
Save named JSON snippets to browser localStorage
Shows exact parse error with line/column or character position

At a glance

free tier

TypeWeb app

DeploymentCloud

PlatformsWeb

CompanyOnlineToolYard

Resources

Pricing

Tool is entirely free with no paid tiers stated.

FreeFree

Free, client-side, no signup required.