Paste messy JSON, get aligned, validated rows.
A fast, privacy-first format & validate surface. Chaos in, a tidy patch panel out.
{ "deploy": { "service": "api-gateway", "region": "eu-west-1", "replicas": 3, "env": { "LOG_LEVEL": "debug", "TIMEOUT_MS": 2500 }, "health": true, "notes": null } }
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01 · What is JSON
A lightweight, human-readable data format.
JSON (JavaScript Object Notation) is the lingua franca of APIs and configuration. It encodes objects, arrays, strings, numbers, booleans and null using a syntax most developers can read at a glance.
jsonglow parses your payload, enforces the grammar, and re-emits it with consistent indentation so nested keys line up like labels on a patch panel. Validation surfaces the exact line and column where a parse would fail — no guesswork.
02 · Capabilities
Every tool a payload needs, in one surface.
Live validation
Instant parse with precise line/column diagnostics on the first malformed token.
Tree view
Collapse and expand nested keys so a 400-line payload reads like a table of contents.
Format & minify
Toggle 2 / 4-space / tab indent, or collapse to a single line for logging and storage.
Type-aware coloring
Keys, strings, numbers and literals each get a distinct hue so structure pops instantly.
Export to file
Copy to clipboard or download a clean .json — everything stays on your device.
Zero upload
All processing runs in the browser. Secrets and tokens never leave your machine.
03 · FAQ
Quick answers.
Does jsonglow send my data anywhere?+
No. Parsing happens entirely client-side. Nothing is transmitted, logged, or stored on a server.
What counts as valid JSON?+
Double-quoted keys and strings, no trailing commas, no comments, and values limited to object, array, string, number, boolean and null. The validator flags each violation with a line and column.
Can I paste very large payloads?+
Yes — multi-megabyte responses format quickly because everything runs locally in your browser with no network round-trip.
Is the JSON formatter free?+
Yes, completely free with no account, no sign-up and no usage limits.
04 · Related tools