Unminify JSON Online — Restore Readable JSON

Unminify minified JSON instantly with our free tool. Restore readable formatting from one-line payloads with detailed structural stats — all locally in your browser.

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JSON Unminification
Unminify and prettify compressed JSON online. Restore readable formatting with stats.

Features

Restore the readability of your minified JSON code by adding spaces and line breaks.

Unminify

Restore the readability of your minified JSON code by adding spaces and line breaks.

Basic example

Minified JSON

{"app":"FastMinify","version":"1.0.0","metrics":{"requests":1000000,"ratio":1.5},"price":10,"empty":"","meta":{},"flags":[true,false,true],"deprecated":null,"notes":"Switch compression: Conservative keeps 1.50 / 10.00; Aggressive drops null & empty"}

Formatted JSON

{ "app": "FastMinify", "version": "1.0.0", "metrics": { "requests": 1000000, "ratio": 1.50 }, "price": 10.00, "empty": "", "meta": {}, "flags": [true, false, true], "deprecated": null, "notes": "Switch compression: Conservative keeps 1.50 / 10.00; Aggressive drops null & empty" }

Minification options

Beautify Options
Indentation options for Beautify and Unminify (not used by Minify)

Indentation Size

Sets the number of spaces or tabs for indentation during Beautify and Unminify

Original code
{"name":"test","value":42}
With 2 spaces
{ "name": "test", "value": 42 }
With 4 spaces
{ "name": "test", "value": 42 }
Difference
Beautify and Unminify both use the indentation controls in the toolbar. Minify ignores them.

Indentation Type

Use spaces or tabs for indentation during Beautify and Unminify

Original code
{"name":"test","value":42}
With spaces
{ "name": "test", "value": 42 }
With tabs
{ "name": "test", "value": 42 }
Difference
Spaces are more standard, tabs may be preferred according to your code conventions.
JSON Statistics
Detailed information about your JSON structure

JSON statistics are automatically calculated and displayed in the results panel after each operation (Minify, Unminify, Beautify).

Keys
12
Objects
3
Arrays
2
Max Depth
3
Strings
5
Numbers
4
Booleans
2
Nulls
1
These statistics help you understand the structure and complexity of your JSON.

Dedicated JSON tools

Beyond minify/unminify on this page, browse the full JSON tools hub: JSON validator, JSON formatter, JSON diff, JSON escape / unescape, and JSON tree viewer — all browser-local.

Need JSON in YAML, CSV or XML?

Dedicated converters now live on their own topical pages — start with JSON → YAML, JSON → CSV or JSON → XML when you intentionally change serialization formats.

JSON Validation

Before minifying or formatting, validate syntax with clear line/column errors. For a dedicated workflow, use our standalone JSON validator, then explore structure in the JSON tree viewer or compare payloads with JSON diff.

JSON Formatter vs Minifier — Understanding the Difference

A JSON formatter (or beautifier) adds indentation and line breaks to make JSON readable and easy to navigate — try the dedicated JSON formatter for prettify-only workflows. The minify-family beautify JSON page shares the same editor UX as other languages. A JSON minifier removes unnecessary whitespace to reduce file size for API responses. String values stay verbatim; escape embedded text via JSON escape or inspect encoding with our URL encoder and Base64 utility.

Frequently Asked Questions — Unminify

Everything about unminification

Can I unminify or format JSON?

Yes, paste minified JSON and click Unminify. Pick 2 or 4 spaces or tabs for indentation.

Beautify instead of unminify?

For valid JSON with detailed stats, use the JSON beautifier.

Unminify

Expand minified or compressed code — unminify JavaScript, CSS, TypeScript, SCSS, LESS, SQL, YAML and other formats when debugging or reviewing.

Explore other tool categories

Minify

Shrink code and assets for production — minify JavaScript, CSS, HTML, JSON and XML before gzip or CDN deploy.

Beautify

Make code readable with consistent indentation — beautify JavaScript, CSS, TypeScript, SCSS, LESS, Markdown, GraphQL, SQL, YAML and more in your browser.

Conversion

Transform data between JSON, YAML, XML and CSV locally — no server uploads.

CSS preprocessors

Compile SCSS or LESS to standard CSS in the browser — pair with beautify or minify for a full stylesheet workflow.

JSON Tools

Validate, format, diff and explore JSON payloads — complementary to minifiers and converters.

SVG Tools

Preview, optimize with SVGO, export Data URI, resize, beautify, convert to JSX and validate SVG — all in your browser.

DevOps & Infra

Terraform HCL format/validate/minify, Dockerfile format & lint, Docker Compose and .env validation.

CI/CD

GitHub Actions and GitLab CI — format YAML and check workflow/job structure in your browser.

Logs & observability

Line-oriented JSON/NDJSON and Nginx/Apache access logs — format, filter, validate, and CSV/TSV.

Kubernetes

Multi-doc manifests, structural validate, Ingress/Deployment starters, and Helm values formatting.

Networking / IP

CIDR, subnets, and IPv4/IPv6 helpers — in your browser.

Security & tokens

JWKS, X.509 certificates, and secrets scan — browser-local.

API & schemas

OpenAPI tools to format, validate, and lint your specs.

Encoding

Encode or decode Base64, URL components and HTML entities — client-side only.

Developer utilities

Timestamps, UUID, ULID, Nanoid, cron, passwords, regex, slugify, number bases, case, text diff, and chmod — all client-side.

Text & Markdown

Count words, build Markdown TOCs, and clean line lists — all in your browser.

AI & LLM

Token counting, pricing estimates, and context-window fit — 100% browser-local.

Serialization

Serialize and deserialize PHP data structures beside JSON workflows.