JSON Viewer — Free Online Tool

Validate JSON, pretty-print compact payloads, and explore nested objects and arrays in a structured tree.

This private tool runs locally in your browser. Your text is never uploaded or sent to a server.

How to use JSON Viewer

Paste the JSON document
Format or validate it
Explore the tree or copy the result

Example

“{"name":"TextJam"}” becomes an indented object with a visible name property.

Useful tips

JSON requires double-quoted keys and strings
Validation errors point toward malformed syntax

JavaScript enables the interactive tool above.

More TextJam tools

Case Converter — UPPER, lower, Title, camelCase & more
Add Line Numbers — Number every line of your text
Text to Slug — Turn text into a URL-friendly slug
Reverse Text — Flip characters, words, or lines
Text Repeater — Repeat text a number of times
Remove Extra Spaces — Collapse runs of whitespace
Remove Line Breaks — Join lines into one paragraph
Remove Duplicate Lines — Keep only unique lines
Sort Lines — Alphabetize or shuffle your lines
Trim Lines — Trim leading & trailing whitespace
Strip HTML Tags — Remove tags, keep the text
Word & Character Counter — Words, characters, sentences & more
Find & Replace — Swap text with plain or regex matches
Base64 Encode / Decode — Encode or decode Base64 text
URL Encode / Decode — Percent-encode text for URLs
Text ↔ Binary — Convert text to binary and back
Lorem Ipsum Generator — Generate placeholder paragraphs
Random String Generator — Generate passwords & random strings
Epoch Converter — Unix timestamp ⇄ date, both ways
Age Calculator — Exact age in years, months & days
Date Difference — Days, weeks & months between two dates
Day Finder — Find what day of the week a date falls on
AI Voice Assistant — Command TextJam with your voice
AI Lab — Clean & analyze AI-generated text
Text & Code Compare — Side-by-side diff for text or code
cURL Diff — Compare and diff two cURL commands
Format cURL — Turn a one-liner into readable, indented flags
Code Screenshot — Turn a code snippet into a shareable image
JSON to Code — Generate typed model code from a JSON sample