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Online JSON Generator

Create JSON objects (or arrays) from simple lines like user.name=Alice or items[0].id=1. Values auto-cast to number/boolean/null when possible, or you can paste raw JSON for arrays/objects.

Category: Developer · URL: /tools/online-json-generator.html
Input (lines) Formats: key=value, key: value, user.name=..., items[0].id=..., or array items - value
Tip: To force a string, wrap it in quotes: "001" or '001'. To embed objects/arrays, paste valid JSON: meta={"a":1}.
Output (JSON) 0 chars
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Privacy: runs locally in your browser. No uploads, no tracking scripts.

How to use

Enter one field per line. Use = or : between key and value. For nested fields use dots, and for arrays use [index].

  1. Type lines like user.name=Alice, age=30, items[0].id=1.
  2. Click Generate to produce JSON.
  3. Use Pretty / Minify and Copy as needed.
Keywords this page targets (natural cluster): online json generator, json generator from key value, key value to json, generate json object online, generate nested json online, dot notation to json, json array generator online, items[0] json generator, json builder from text, convert lines to json, json pretty generator, json minify generator, json from form fields text, create sample json online, json generator for api payload, json type casting generator, json from properties list, quick json object creator
Secondary intents covered: Generate a JSON object from key=value lines, Create nested JSON using dot notation paths, Build JSON arrays using [index] notation or dash list, Auto-convert values to number/boolean/null when appropriate, Paste raw JSON values for objects/arrays inside fields, Pretty-print or minify the generated JSON, Copy the JSON output to the clipboard for use in code or API requests, Fix common input mistakes and see clear error messages

FAQ

What input formats does this JSON generator accept?

Use one entry per line with key=value or key: value. For arrays you can use items[0].id=1 or dash items like - hello.

How do I create nested JSON objects?

Use dot notation in keys, for example user.profile.name=Sam creates nested objects.

How do I generate JSON arrays?

Use bracket indexes like items[0].name=Pen, or switch Root to Array and enter plain values (or use - value lines).

Does it auto-detect numbers, booleans, and null?

Yes: 30, true, false, and null are converted automatically. Wrap values in quotes to force strings (e.g., "001").

Can I embed objects or arrays as values?

Yes—paste valid JSON like meta={"a":1} or tags=["dev","ops"].

Why am I seeing an “Index used on a non-array” error?

It usually means you used [0] on a path that was already created as an object. Keep the structure consistent or disable Strict paths if you want looser behavior.

Is my data sent to a server?

No. The generator runs entirely in your browser and does not make network requests.