Minify JSON Online — Free JSON Compressor

Minify JSON instantly with our free tool. Compress payloads for production with detailed structural stats — all locally in your browser with no uploads.

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JSON Minification
Minify JSON online. Compress payloads for production with local validation and stats.

Features

Reduce the size of your JSON code by removing spaces, comments and unnecessary characters.

Minify

Reduce the size of your JSON code by removing spaces, comments and unnecessary characters.

Basic example

Input 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" }

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"}

Minification options

Compression Level
Conservative preserves source decimal formatting (1.50 stays 1.50). Normal tightens numbers (1.50 → 1.5). Aggressive also enables null/empty cleanup toggles automatically.

Load the sample and switch modes: Conservative keeps trailing decimals, Normal optimizes them, Aggressive removes null, empty keys, and empty {}.

ConservativeConservative — whitespace + preserve decimals from source text
NormalNormal — whitespace + number tightening
AggressiveAggressive — like Normal + auto-enables null/empty cleanup

Compression examples:

Original code
{ "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" }
Conservative
{"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"}
Normal
{"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"}
Aggressive
{"app":"FastMinify","version":"1.0.0","metrics":{"requests":1000000,"ratio":1.5},"price":10,"flags":[true,false,true],"notes":"Switch compression: Conservative keeps 1.50 / 10.00; Aggressive drops null & empty"}
Optimize Numbers
Optimizes number representation (removes unnecessary zeros)

Comparison with/without option:

Original code
{ "price": 10.00, "count": 0, "rate": 1.0 }
With optimizeNumbers: true
{"price":10,"count":0,"rate":1}
With optimizeNumbers: false
{"price":10.00,"count":0,"rate":1.0}
Difference
Numbers are optimized (unnecessary zeros removed)
Remove Null Values
Removes properties with null values

Comparison with/without option:

Original code
{ "name": "test", "value": null, "active": true, "count": null }
With removeNullValues: true
{"name":"test","active":true}
With removeNullValues: false
{"name":"test","value":null,"active":true,"count":null}
Difference
Properties with null values are removed
Remove Empty Arrays
Removes empty arrays from JSON

Comparison with/without option:

Original code
{ "name": "test", "items": [], "active": true, "tags": [] }
With removeEmptyArrays: true
{"name":"test","active":true}
With removeEmptyArrays: false
{"name":"test","items":[],"active":true,"tags":[]}
Difference
Empty arrays are removed
Sort Object Keys
Sorts object keys alphabetically

Comparison with/without option:

Original code
{ "zebra": "striped", "apple": "red", "banana": "yellow" }
With sortObjectKeys: true
{"apple":"red","banana":"yellow","zebra":"striped"}
With sortObjectKeys: false
{"zebra":"striped","apple":"red","banana":"yellow"}
Difference
Object keys are sorted alphabetically

See Beautify indentation options →

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 — Minify

Everything about minification

Why minify JSON?

JSON minification removes whitespace to shrink payloads — important for APIs, configs and storage.

Need to unminify JSON?

Use our JSON unminifier to restore readable formatting.

Need to beautify JSON?

Use our JSON beautifier with customizable indentation.

Is my JSON processed securely?

All processing runs locally in your browser.

Minify

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

Explore other tool categories

Beautify

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

Unminify

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

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.

Serialization

Serialize and deserialize PHP data structures beside JSON workflows.