jsonecho

JSON to Go

Paste a JSON sample and get Go types for it.

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How to use JSON to Go

  1. Paste a representative JSON sample, ideally one with all the optional fields filled in.
  2. Set the name of the root type, and decide whether you want helper code as well or types only.
  3. Copy the generated Go code into your project.

About JSON to Go

Writing model classes by hand for a big JSON payload is dull, and it is where typos creep in. Paste a sample here and the generator works out the structure: which fields exist, which are objects, which are arrays and what type each value has. The output is structs with json struct tags, plus Unmarshal and Marshal helper functions.

Names are exported in PascalCase and acronyms like ID and URL are kept in capitals, which is what linters expect. Everything runs in your browser, so your sample data stays on your machine.

Using the generated code

Call UnmarshalRoot(data), or use json.Unmarshal(data, &root) if you only copied the types.

Optional fields are pointers with the omitempty tag, so missing and zero values can be told apart.

Frequently asked questions

What does the generated Go code depend on?

The output is structs with json struct tags, plus Unmarshal and Marshal helper functions.

How do I parse JSON with the result?

Call UnmarshalRoot(data), or use json.Unmarshal(data, &root) if you only copied the types.

How are optional and missing fields handled?

Optional fields are pointers with the omitempty tag, so missing and zero values can be told apart.

Does the generator look at more than one record?

It only knows what is in your sample. If a field is missing from your example, it will not appear in the types, and if a value is null in your example, its type is unknown. Paste an example in which as many fields as possible are filled in, or paste an array with several different records.

Is my JSON sent to a server?

No. The generator is downloaded to your browser the first time you use it, about 1 MB, and everything runs locally.

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