AST comparison

You can compare ASTs in different ways:

• Use VSCode "select to compare" feature to compare the JSON files. Likely one of the best.

  

• Use the npm package json-diff-kit to compare JSON files.

• Use the check method of ast-type nodes to check consistency of the AST.

• Use an ordinary diff tool to compare JSON files.

  ➜  ast-compare git:(main) diff actual-a-equal-4.json expected-a-equal-4.json 
    10,11c10
    <             "type": "Identifier",
    <             "name": "a"
    ---
    >             "type": "Identifier"
    14,15c13
    <             "type": "Literal",
    <             "value": 4
    ---
    >             "type": "Literal"

• Another way to compare JSON files is to use the website https://www.jsondiff.com/.

• Use the npm package ast-compare to compare ASTs.

• Use the npm package json-diff to compare JSON files.

json-diff-kit

➜  ast-compare git:(main) ✗ npx jsondiff --help
Usage: jsondiff [options] [command]

A better JSON differ & viewer, support LCS diff for arrays and recognise some changes as "modification" apart from simple "remove"+"add".

Options:
  -V, --version                   output the version number
  -h, --help                      display help for command

Commands:
  run [options] <before> <after>  Shows a difference between two JSON files.
  help [command]                  display help for command